"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:f6b1db4a-8b9b-4798-bcb6-86b46dbe82fc","http://resolver.tudelft.nl/uuid:f6b1db4a-8b9b-4798-bcb6-86b46dbe82fc","Developments in the management of flood defences and hydraulic infrastructure in the Netherlands","Jonkman, Sebastiaan N. (TU Delft Hydraulic Structures and Flood Risk; Ministry of Infrastructure and the Environment); Voortman, H.G. (TU Delft Hydraulic Structures and Flood Risk; Arcadis); Klerk, W.J. (TU Delft Hydraulic Structures and Flood Risk; Deltares); van Vuren, S. (TU Delft Hydraulic Structures and Flood Risk; Ministry of Infrastructure and the Environment; HKV Consultants)","","2018","This article highlights recent developments in flood risk management in the Netherlands and presents approaches for reliability analysis and asset management for flood defences and hydraulic infrastructure. The functioning of this infrastructure is of great importance for the country as large parts of it are prone to flooding. Based on a nationwide flood risk assessment, new safety standards for flood defences have been derived in the form of maximal acceptable failure probabilities. A framework for the reliability-based analysis of the performance of hydraulic infrastructure is introduced. Within this context, various challenges are discussed, such as the dynamic nature of loads, resistance and reliability requirements over time. Various case studies are presented to highlight advances and challenges in various application fields. The first case illustrates how structural health monitoring contributes to a better characterisation of the reliability of the defences and how innovative measures can enhance the reliability. The second case discusses how the river system can be managed in the context of the new safety standards. The third case shows how upgrades and reinforcements of hydraulic structures can be evaluated taking into account (uncertain) future developments, such as sea level rise.","asset management; dikes; flood defences; Flood risk; hydraulic structures; reliability; risk management; rivers","en","journal article","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:de9b3e6a-af95-4af5-8be2-0dd1088fd1f7","http://resolver.tudelft.nl/uuid:de9b3e6a-af95-4af5-8be2-0dd1088fd1f7","Potential contribution of hydro power plants to the energy consumption of East Asian islands","Hoes, O.A.C.; Meijer, L.J.J.; Sarfianto, D.R.; Van der Ent, R.J.","","2014","Population growth, increasing energy demand and depleting fossil fuel resei-ves put a pressure on conventional methods of electricity generation. Hydropower is an alternative energy source that is known to have a large capacity potential. However, previous estimations of the potential capacity have been inconsistent and incomplete. In this study we identified all locations on East Asian islands (from Japan, Taiwan Phillipines to Indonesia) which are suitable for hydropower. For this we combined USGS's HydroSHEDS elevation data with Global Runoff data from the Global Runoff Data Centre. Such large spatially data gives especially unique information which was not available before. We computed that the total gross hydropower capacity potential is about 2885 TWh per year. Large hydropower accounts for over 27% of this potential, around 39% by small plants, 28% by mini hydropower plants, while micro hydropower only accounts for 6 % of the total potential capacity. Overall this study provides spatially detailed global data that allows both a quick comparison of hydropower potential between regions as well as detailed information on specific hydropower locations, which is especially unique new information for micro hydropower.","runoff; hydropower plants; energy; rivers","en","conference paper","Institute of lowland and marine Research Saga University","","","","","","","","Civil Engineering and Geosciences","Water Management","","","",""
"uuid:f12389ee-9ae9-4c7e-bb99-a27da0449f6f","http://resolver.tudelft.nl/uuid:f12389ee-9ae9-4c7e-bb99-a27da0449f6f","Classifying sediments on Dutch riverbeds using multi-beam echo-sounder systems","Eleftherakis, D.","Simons, D.G. (promotor)","2013","The economic importance of the Dutch rivers is very high as they are heavily used for inland waterway transport between the Netherlands and their neighbouring countries. A minimum depth must be guaranteed to keep the rivers navigable but also to ensure that the ships can carry maximum cargo. An attractive system for obtaining information about the riverbed bathymetry is the multi-beam echo-sounder (MBES). Furthermore, the MBES received echoes due to acoustic backscatter from the sediments in theory also allow for discriminating between different sediments. The aim of the research presented in this thesis was to develop methods for discriminating between different river sediments using MBES measurements. In order to fulfil this aim, MBES surveys were performed in the Rhine river and the Meuse river between 2007 and 2010. The research shows that indeed the MBES system can be used for discriminating between the different sediments present in the river areas. In addition an important finding is that areas differing in sediment type require different classification approaches.","classification; sediments; rivers; multibeam","en","doctoral thesis","","","","","","","","","Aerospace Engineering","Air Transport and Operations","","","",""
"uuid:118445fc-6696-4fe2-abae-53272b80db43","http://resolver.tudelft.nl/uuid:118445fc-6696-4fe2-abae-53272b80db43","An inter-comparison of sediment classification methods based on multi-beam echo-sounder backscatter and sediment natural radioactivity data","Snellen, M.; Eleftherakis, S.; Amiri-Simkooei, A.; Koomans, R.L.; Simons, D.G.","","2013","This contribution presents sediment classification results derived from different sources of data collected at the Dordtse Kil river, the Netherlands. The first source is a multi-beam echo-sounder (MBES). The second source is measurements taken with a gamma-ray scintillation detector, i.e., the Multi-Element Detection System for Underwater Sediment Activity (Medusa), towed over the sediments and measuring sediment natural radioactivity. Two analysis methods are employed for sediment classification based on the MBES data. The first is a Bayesian estimation method that uses the average backscatter data per beam and, therefore, is independent of the quality of the MBES calibration. The second is a model-based method that matches the measured backscatter curves to theoretical curves, predicted by a physics-based model. Medusa provides estimates for the concentrations of potassium, uranium, thorium, and cesium, known to be indicative for sediment properties, viz. mean grain size, silt content, and the presence of organic matter. In addition, a hydrophone attached to the Medusa system provides information regarding the sediment roughness. This paper presents an inter-comparison between the sediment classification results using the above-mentioned methods. It is shown that although originating from completely different sources, the MBES and Medusa provide similar information, revealing the same sediment distribution.","backscatter; Bayes methods; geochemistry; geophysical techniques; hydrophones; natural radioactivity hazards; rivers; scintillation counters; sediments; soil pollution","en","journal article","Acoustical Society of America","","","","","","","2014-02-01","Aerospace Engineering","Control & Operations","","","",""
"uuid:fdd34e74-03a7-458f-bb89-40640a312e74","http://resolver.tudelft.nl/uuid:fdd34e74-03a7-458f-bb89-40640a312e74","Methodology for dense spatial sampling of multicomponent recording of converted waves in shallow marine environments","El Allouche, N.; Drijkoningen, G.G.; Van der Neut, J.R.","","2010","A widespread use of converted waves for shallow marine applications is hampered by spatial aliasing and field efficiency. Their short wavelengths require dense spatial sampling which often needs to be achieved by receivers deployed on the seabed. We adopted a new methodology where the dense spatial sampling is achieved in the common-receiver domain by reducing the shot spacing. This is done by shooting one track multiple times and merging the shot lines in an effective manner in a separate processing step. This processing step is essential because positioning errors introduced during the field measurement can become significant in the combined line, particularly when they exceed the distance between two adjacent shot positions. For this processing step, a particular shot line is used as a reference line and relative variations in source and receiver positions in the other shot lines are corrected for using crosscorrelation. The combined shot line can subsequently be regularized for further processing. The methodology is adopted in a field experiment conducted in the Danube River in Hungary. The aim of the seismic experiment was to acquire properly sampled converted-wave data using a multicomponent receiver array. The dense spatial sampling was achieved by sailing one track 14 times. After correcting for the underwater receiver positions using the direct arrival, the crosscorrelation step was applied to merge the different shot lines. The successfully combined result is regularized into a densely sampled data set free of visible spatial aliasing and suitable for converted-wave processing.","geophysical techniques; rivers; seismic waves; seismology","en","journal article","Society of Exploration Geophysicists","","","","","","","","Civil Engineering and Geosciences","Geoscience & Engineering","","","",""
"uuid:ef2c2b63-c4e4-4e3f-bed2-57ed98e4454c","http://resolver.tudelft.nl/uuid:ef2c2b63-c4e4-4e3f-bed2-57ed98e4454c","Dynamics of shallow lateral shear layers: Experimental study in a river with a sandy bed","Sukhodolov, A.N.; Schnauder, I.; Uijttewaal, W.S.J.","","2010","Shallow lateral shear layers forming between flows with different velocities, though essential for mixing processes in natural streams, have been examined only in laboratory settings using smooth, fixed?bed channels. This paper reports the results of an experimental study of a shear layer in a straight reach of a natural river where the layer, in contrast to the two?dimensional structure observed in the laboratory, is highly three?dimensional. The study included pronounced transverse pressure gradients, which influenced shear layer structure compared to flume experiments. It also introduces an analysis that complements conventional theory on mixing layers. The lateral velocity gradient between the flows downstream from a splitter plate placed in the river, the principal controlling factor, was adjusted for three experimental runs to determine the influence of different gradients on shear?layer dynamics. In each run, detailed three?dimensional measurements of mean and turbulent characteristics were obtained at five cross sections downstream from the splitter plate. Although experimental results agreed with conventional mixing?layer theories with respect to turbulence, the dynamics of the shear layers were dominated by the mean lateral fluxes of momentum. After re?examining the governing equations, we developed a parabolic equation describing the shear layer evolution and several scaling relations for essential terms of the energy budget: mean and turbulent lateral fluxes of momentum, turbulent kinetic energy, and dissipation rates. The study also provides insight into the spectral dynamics of turbulence in the shear layer and clarifies previous observations reported for confluences in natural streams.","rivers; confluences; shear layers; turbulence","en","journal article","American Geophysical Union","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:829e0d8a-fa6d-4b09-8ba5-793da681e725","http://resolver.tudelft.nl/uuid:829e0d8a-fa6d-4b09-8ba5-793da681e725","Riverbed sediment classification using multi-beam echo-sounder backscatter data","Amiri-Simkooei, A.; Snellen, M.; Simons, D.G.","","2009","A method has recently been developed that employs multi-beam echo-sounder backscatter data to both obtain the number of sediment classes and discriminate between them by applying the Bayes decision rule to multiple hypotheses [ Simons and Snellen, Appl. Acoust. 70, 1258–1268 (2009) ]. In deep water, the number of scatter pixels within the beam footprint is large enough to ensure Gaussian distributions for the backscatter strengths and to increase the discriminative power between acoustic classes. In very shallow water (<10?m), however, this number is too small. This paper presents an extension of this high-frequency methodology for these environments, together with a demonstration of its performance using backscatter data from the river Waal, The Netherlands. The objective of this work is threefold. (i) Increasing the discriminating power of the classification method: high-resolution bathymetry data allow precise bottom slope corrections for obtaining the true incident angle, and the high-resolution backscatter data reduce the statistical fluctuations via an averaging procedure. (ii) Performing a correlation analysis: the dependence of acoustic backscatter classification on sediment physical properties is verified by observing a significant correlation of 0.75 (and a disattenuated correlation of 0.90) between the classification results and sediment mean grain size. (iii) Enhancing the statistical description of the backscatter intensities: angular evolution of the K-distribution shape parameter indicates that the riverbed is a rough surface, in agreement with the results of the core analysis.","acoustic signal processing; backscatter; Bayes methods; correlation methods; fluctuations; Gaussian distribution; rivers; sediments; signal classification","en","journal article","Acoustical Society of America","","","","","","","","Aerospace Engineering","Remote Sensing","","","",""
"uuid:42616303-ea10-41de-ad13-fbce2c1f8739","http://resolver.tudelft.nl/uuid:42616303-ea10-41de-ad13-fbce2c1f8739","A model-based method for reducing the sound speed induced errors in multi-beam echo-sounder bathymetric measurements","Snellen, M.; Siemes, K.; Simons, D.G.","","2009","We present a method for accurately estimating the bathymetry from multi-beam echo-sounder (MBES) travel-time measurements in environments with large variations in the water column sound speeds (both temporally and spatially). In this type of environments the water column sound speeds at the time of the MBES transmission are often not known, preventing a reliable conversion from the measured travel-times to bathymetry. In addition, accurate sound speed information is required for the MBES beamsteering process. Situations where information regarding the prevailing sound speeds is insufficient occur, for example, in estuaries where fresh river water mixes with seawater. The method fully exploits the redundancy in the MBES measurements obtained from the overlap of adjacent swathes. It searches for those water column sound speeds that result in a maximum agreement in the bathymetry along the overlapping swathes. The Gauss-Newton method is employed for the optimization. This method is very efficient, requiring a few iterations only and therefore very well suited for processing the large datasets as typically obtained by the MBES. From simulations it is shown that the method performs well and allows for an almost exact determination of the bathymetry and sound speeds. In principle, the method eliminates the need for sound speed measurements, as long as sufficient overlap exists.","bathymetry; oceanographic techniques; rivers; seafloor phenomena; seawater; underwater sound","en","conference paper","IEEE","","","","","","","","Aerospace Engineering","Remote Sensing","","","",""
"uuid:249e7306-490a-49d5-919a-0f3c9eec45bf","http://resolver.tudelft.nl/uuid:249e7306-490a-49d5-919a-0f3c9eec45bf","Morfologische effecten van zandwinning in de Merwedes","Mosselman, E.; Wijbenga, J.H.A.","","2007","","riviermorfologie; river morphology; rivieren; rivers; riviermonden; river mouths; Waal","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:234c6156-f828-41e6-ad32-f5e8e2816989","http://resolver.tudelft.nl/uuid:234c6156-f828-41e6-ad32-f5e8e2816989","The impact of changes in sediment supply and sea-level on fluvio-deltaic stratigraphy","Hoogendoorn, R.M.","Kroonenberg, S.B. (promotor)","2006","Studies in stratigraphy are often driven by the predicted climate change and possible gains for the oil and gas industry. Because, at present predictions of the development of future deltaic architecture are insufficient. This thesis addresses the problem of qualitative and quantitative understanding of sedimentary systems in two stages. In the first stage the stratigraphy of Holocene delta deposits of the Kura and Mahakam deltas (respectively in Azerbaijan en Indonesia) are studied. Results from these studies provide insights as an analogue to ancient systems and serve as an example for expected future conditions. The results form the Kura delta show a prominent role for the rapid sea-level change of the Caspian Sea, while the results of Mahakam delta suggest an important role for the eustatic Holocene sea-level curve and the absence of floods of the Mahakam River. Information obtained from studies in a similar context have the potential to reduce uncertainties and increase confidence in models. The second stage of this thesis covers the development of a process-response simulation model to assess the impact of changes in sediment supply and sea-level on fluvio-deltaic stratigraphy. Anticipating on the dominant role of sediment supply on fluvial dominated deltas, a choice is made for a detailed investigation in how to incorporate good estimates of sediment supply in the numerical model, that enable to explore the possibilities of using a probabilistic approach instead of a deterministic output or geostatistical analysis.","deltas; rivers; caspian sea; borneo; stochastic modelling; probabilities","en","doctoral thesis","","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:fe591efc-4b0a-4565-87db-640f4921cbb5","http://resolver.tudelft.nl/uuid:fe591efc-4b0a-4565-87db-640f4921cbb5","Veiligheid tegen overstromen: Kosten-batenanalyse voor Ruimte voor de Rivier, deel 1","Eijgenraam, C.J.J.","TU Delft","2005","This report is part 1 of a Cost-Benefit Analysis of the project Space for the Rivers, which aims at improving the safety against flooding along the river Rhine. A new method has been developed to find the optimal safety level for dike rings against flooding and the accompanying investment strategy. This method has been applied to 22 dike rings along the rivers. An important outcome is that the current safety norms in the Act on the Water defences turn out to be not optimal from an economic point of view. For 16 dike rings, the optimal safety level is higher than their present legal norm, for 9 of them even more than twice. This is especially true for the two dike rings in the province Utrecht: Kromme Rijn and Gelderse Vallei. On the other hand, the dike ring Biesbosch (Noordwaard) should no longer be a well-protected dike ring. The outcomes support a robust investment strategy which takes future changes fully into account.","cost benefit analysis; flood risk; rivers","en","report","CPB (Centraal Planbureau)","","","","","","","","","","","","",""
"uuid:1107be41-27fb-430c-a63c-09fe839fc928","http://resolver.tudelft.nl/uuid:1107be41-27fb-430c-a63c-09fe839fc928","Sediment exchange between the main channel and the groyne fields of a river","Yossef, M.F.M.","","2003","Report on a physical scale model test in the Fluid Mechanics lab on the effect of groynes on the bed and sediment transport in rivers.","groynes; rivers; river morphology; sediment transport; Delft Cluster; DC 03.03.04","en","report","Delft Cluster","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:11602ede-efed-4fbc-813c-31245bb87a3d","http://resolver.tudelft.nl/uuid:11602ede-efed-4fbc-813c-31245bb87a3d","A Vertical Sorting Model for Rivers with Non-uniform Sediment and Dunes","Blom, A.","De Vriend, H.J. (contributor); Parker, G. (contributor); Ribberink, J.S. (contributor); TU Delft","2003","Vertical sorting fluxes and the resulting organisation of grain size fractions over bed elevations, i.e. the vertical sorting profile, influence bedform dimensions and the bed surface composition. As a result, they will affect the bed roughness, the rate and composition of the sediment transport, the large-scale river morphology, and water levels during floods. An important problemof presentmorphologicalmodel systems for rivers with non-uniform sediment is their neglect of vertical sorting fluxes other than through net aggradation or degradation. The objective of the present study is to develop a method in order to better account for vertical sorting processes in the river bed. Net aggradation or degradation of the river bed results from divergences in the sediment transport rate, which is expressed by the mass balance equation. In rivers withnon-uniform sediment, a divergence in the transport rate of a specific size fraction will result in changes in the composition of the bed surface and net aggradation or degradation of the river bed. A further complication in the mass balance is the vertical sorting. A plane bed is usually covered with a coarse bed layer (mobile pavement or armour layer),whereas in bedform-dominated conditions the coarse size fractions are mainly found in the lower parts of the bedforms. In a morphological model system for non-uniform sediment, the above interaction is described in terms of sediment continuity models. Hirano (1971) was the first to develop such a model. Yet, the Hirano active layer model and most of its variants suffer from a number of shortcomings. Most bed layer models do not account for vertical sorting other than through net aggradation or degradation, whereas flume experiments have shown that vertical sorting also occurs through grain size-selective deposition down a bedformlee face and the variability in trough elevations. Hiranos assumption that the bed elevations interacting with the flow constitute a distinct surface layer seems too limited to adequately account for these sorting processes. A final problem of these models with discrete bed layers is that in certain situations the set of equations becomes elliptic in parts of the space-time domain. This means that solving the equationswould require future time-boundaries,which is physically unrealistic. In the present study, two sets of flume experiments have been conducted, in order to obtain a better insight into vertical sorting processes and to obtain data on vertical sorting in bedforms under well-controlled laboratory conditions. Vertical sorting profiles were measured using newly-developed core sampling boxes. The experiments have shown that the sorting within migrating bedforms is dominated by (1) grain size-selective deposition down the avalanche lee face (resulting in a downward coarsening trend within the bedforms), (2) partial transport, and (3) the winnowing of fines from the trough surface and subsurface. The experiments point towards a close relation between the variability in trough elevations and the (time scale of) vertical sorting. This can be understood when considering that, through migration, a dune redistributes all bed material above its trough elevation. The author has developed a new continuum vertical sorting model for conditions dominated by bedforms and bed load transport. It is based on (1) the Parker-Paola-Leclair framework for sediment continuity, (2) the Einstein step length formulation, (3) a newly-developed lee sorting function, and (4) a newly-eveloped method to account for the variability in bedform trough elevations. Parker et al. (2000) developed a new type of framework for sediment continuity that no longer distinguishes discrete bed layers, thus enabling us to relate entrainment and deposition fluxes in the bed to the likelihood of a bed elevation being exposed to the flow. Parameters in the framework such as the grain size-specific and entrainment and deposition fluxes vary continuously over bed elevations. The present study comprehends the derivation of formulations for these fluxes for bedform-dominated conditions. For equilibrium conditions, the continuum sorting model is reduced to an equilibrium sorting model, which comprises two methods to solve for the equilibrium sorting profile. For non-equilibrium conditions, the continuum sorting model is reduced to a sorting evolution model. It solves for the time evolution of both the vertical sorting profile and the bed load transport composition fromthe following parameters: the initial sorting profile, the total bed load transport rate, and the probability density function (PDF) of relative trough elevations. Both reduced models describe sorting through grain size-selective deposition down the bedform lee face and the variability in trough elevations. In addition, methods are proposed to account for vertical sediment fluxes through both a change in time of the PDF of relative trough elevations and net aggradation or degradation. However, testing the continuumsorting model for situations with net aggradation or degradation was beyond the scope of the thesis. In a morphological model system, the equilibrium sorting model may be applied instantaneously in case the time scale of large-scale morphological changes is much larger than the time scales of vertical sorting, vertical dune dimensions, and dune migration. This constraint seems to be satisfied in situations with large-scale aggradation or degradation, such as long-term bed degradation after a river bend cut-off or long-term aggradation or degradation due to river training works. For situations with local small-scale aggradation or degradation, e.g., in river bends, it is likely that the time evolution of sorting needs to be accounted for when computing changes in morphology. In that case, the sorting evolution model must be applied. The equilibrium sorting model was calibrated and verified against flume experiments. Two constants in the lee sorting function were used as calibration constants. The sorting evolution model was verified by comparing the computed time evolution of both the vertical sorting profile and the bed load transport composition to measured data from flume experiments. No parameters were calibrated upon. The computations by both models agree reasonably well with the measured data. Note that the continuum sorting model computes the bed load transport composition by itself. This suggests that there is a strong interaction among (1) the vertical sorting profile, (2) the PDF of relative trough elevations, and (3) the bed load transport composition. It is believed that this strong interaction does not allow for one of the components to be modelled independently from one another. The results indicate that also the bed roughness is intimately connected to the vertical sorting profile and the PDF of trough elevations. The new continuum sorting model is deterministic in the computation of the vertical sorting profile, but probabilistic in terms of the bed surface. This probabilistic element arises from the fluctuations of the bed surface due to the presence of bedforms. The continuum sorting model is the first to incorporate sediment sorting fluxes through grain size-selective deposition down the bedform lee face, the variability in trough elevations, a change in time of the PDF of relative trough elevations, and net aggradation or degradation. Because of its improved description of the vertical sorting profile, the continuumsortingmodel yields better predictions of the bed surface composition than the discrete bed layermodels presently available. Since the bed surface composition plays a crucial role in the sediment transport, it is believed that themodelwill also lead to improved predictions of sediment transport rates and thus morphological changes, although testing the model as part of a morphological model system was beyond the scope of the present study. In order to use the new continuum sorting model in predictive applications, the model needs to be extended to plane-bed conditions and a sub-model for the PDF of relative trough elevations needs to be developed.","sediment; dunes; sorting model; rivers; non-uniform; vertical","en","report","UT (University of Twente)","","","","","","","","","","","","",""
"uuid:ae661060-5509-47de-8f83-bf110c77a4e6","http://resolver.tudelft.nl/uuid:ae661060-5509-47de-8f83-bf110c77a4e6","Environmental flow requirements for rivers: An integrated approach for river and coastal zone management","Marchand, M.","","2003","","rivers; coasts; environmental flows","en","report","Delft Cluster","","","","","","","","","","","","",""
"uuid:115c96a3-6c4e-48c1-a698-f831829d184c","http://resolver.tudelft.nl/uuid:115c96a3-6c4e-48c1-a698-f831829d184c","A linear approach for the evolution of coherent structures in shallow mixing layers","Van Prooijen, B.C.; Uijttewaal, W.S.J.","","2002","The development of large coherent structures in a shallow mixing layer is analyzed. The results are validated with experimental data obtained from particle tracking velocimetry. The mean flow field is modeled using the self-similarity of the velocity profiles. The characteristic features of the down-stream development of a shallow mixing layer flow, like the decrease of the velocity difference over the mixing layer, the decreasing growth of the mixing layer width, and the transverse shift of the center of the mixing layer layer are fairly well represented. It turned out that the entrainment coefficient could be taken constant, equal to a value obtained for unbounded mixing layers: ? = 0.085. Linearization of the shallow water equations leads to a modified Orr–Sommerfeld equation, with turbulence viscosity and bottom friction as dissipative terms. Growth rates are obtained for each position downstream, using the model for the mean flow field. For a given energy density spectrum at the inflow boundary, integration of the growth rates along the downstream direction yields the spectra at various downstream positions. These spectra provide a measure for the intensity and the length scale of the coherent structures (the dominant mode). The length scales found are in good agreement with the measured ones. The length scale of the most unstable mode appears much larger than the length scale of the dominant mode. Obviously, the longevity of the coherent structures plays a significant role. Three growth regimes can be distinguished: in the first regime the dominant mode is growing, in the second regime the dominant mode is dissipating, but other modes are still growing, and in the third regime all modes are dissipating. It is concluded that the development of the coherent structures in a shallow mixing layer can fairly well be described and interpreted by the proposed linear analysis.","rivers; channel flow; mixing; turbulence; flow instability; flow visualisation; hydrology; fractals","en","journal article","American Institute of Physics","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:9de6e91f-786c-4ae2-b909-7513438d5849","http://resolver.tudelft.nl/uuid:9de6e91f-786c-4ae2-b909-7513438d5849","Opstelling voor meting hoogwaterpeil","Jongeling, T.H.G; Blok, B.W.G.","","2002","","waterstandmeting; water level measurement; stroming; flow; golven; waves; golfdemping; wave damping; bemonstering; sampling; rivieren; rivers","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:b9545ba7-2423-4c20-ace2-0e1cd799d18a","http://resolver.tudelft.nl/uuid:b9545ba7-2423-4c20-ace2-0e1cd799d18a","The effect of groynes on rivers: Literature review","Yossef, M.F.M.","","2002","Groynes are structures constructed at an angle to the flow in order to deflect the flowing water away from critical zones. They are made of stone, gravel, rock, earth, or piles, beginning at the riverbank with a root and ending at the regulation line with a head. They serve to maintain a desirable channel for the purpose of flood control, improved navigation and erosion control. In the River Rhine, which is considered the backbone of North-western European waterways network, the primary objective of groynes is to provide a fairway of sufficient depth and width. For example the River Waal, the most important branch of the Rhine River in the Netherlands is regulated by around 500 groyne. Within the framework of the research project ""Space for the Rhine Branches"" several measures have been devised to achieve a decrease of the water levels at peak discharges, one of those measures, is lowering of the existing groynes. The rationale behind this proposal is that; due to large-scale erosion of the low-water bed through the past decades, the groynes are now higher than necessary for keeping the main channel at depth. Lowering the groynes along certain reaches of the river would result in a reduction of the effective roughness during high water conditions thus, increasing the river's flood conveyance capacity. If the groynes are lowered, however, the balance of hydrodynamic forces acting on the groyne-fields will change, and there will be a large-scale morphological impact. To identify this impact, a thorough understanding to the effect o f groynes on the morphology of the river is necessary. The sediment exchange between the groyne-fields and the main channel needs to be more comprehensible. The purpose of this report is to acquire the background knowledge required to study the effect of groynes on a river. The characteristics of the existing groyne-fields along the Waal River are presented. The hydrodynamic and morphological impact of groynes on a river is described. Moreover, because navigation plays an important role in the interaction between the groyne fields and the main channel, the navigation induced water motion and its effect on the flow in groyne-fields is described. Finally, a review of some prediction attempts to the interaction between the groyne-fields and the main channel is presented.","groynes; rivers; Delft Cluster; DC 03.03.04","en","report","Delft Cluster","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:1ee18f19-cb9e-4bdb-a447-d0cd2c113e3e","http://resolver.tudelft.nl/uuid:1ee18f19-cb9e-4bdb-a447-d0cd2c113e3e","Gevoelens bij aanwijzen en gebruik van retentiegebieden en groene rivieren","Baan, P.J.A.; Rabou, J.P.","","2002","","hoogwaters; floods; overstromingen; floods; waterretentie; water retention; rivieren; rivers","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:461ce3fd-4ead-4550-9a23-71b4f2fa826c","http://resolver.tudelft.nl/uuid:461ce3fd-4ead-4550-9a23-71b4f2fa826c","RIVERSandLAND: Dikes for eternity, an ace up our sleeve","Wondergem, P.J.M.","Rijkswaterstaat","2001","This investigation is aimed at creating an alternative concept of living with water and required flood safety for the large Dutch rivers, which concept can be realised over some hundred of years. It has provided the opportunity for frank and open thinking and discussion, and should lead to a concept that can be also used in other areas. An important starting point was that many people in the Netherlands must still be able to live, work and enjoy recreation in that area under comparable conditions with regard to prosperity and welfare as they do today. The concept that was developed, now called the RiversandLand safety concept, gives water all the space it needs, by which even the highest imaginable discharge wave in the big rivers will cause only a relatively slight increase in water level. The consequence is that this area will then look completely different from the current river landscape. The very low-lying areas will be permanently under water, while there will be other areas that will never or almost never be flooded. The areas in-between will become wet or dry depending on how high the land lies. Flooding will occur between once a year and several times a century.","rivers; safety against flooding","en","report","Rijkswaterstaat, DWW","","","","","","","","","","","","TAW/ENW",""
"uuid:40545be3-9d32-41f3-9674-cd817fa8ca52","http://resolver.tudelft.nl/uuid:40545be3-9d32-41f3-9674-cd817fa8ca52","One-dimensional models for mountain-river morphology","Sieben, A.","","1996","In this report, some classical and new simplifications in mathematical and numerical models for river morphology are compared for conditions representing rivers in mountainous areas (high values of Froude numbers and relatively large values of sediment transport rates). Options for simplification are summarized based on time scale of hydrographs and length scales of river geometry. This results in concepts based on quasi-steady and/or quasi-uniform flow assumptions. Additionally, the behaviour of frictionless, critical flow with a mobile bed is considered. The non-linear interaction between changing flow and morphology is investigated for different values of the Froude number. Neglecting this interaction in numerical solution procedures appears to affect the solution. Also, mass and momentum contributions of sediment in transport on the mixture of water and sediment are analyzed. It is shown that errors due to simplification in numerical models for river morphology vary with the different up- or downstream propagating waves that are part of the solution. Conclusions further refer to the importance of wave non-uniformity (wave length, dominance of friction), Froude number and bed mobility on the error made when using simplified modelling concepts. Application of simplified modelling concepts based on subcritical low-land rivers in the modelling of transcritical and supercritical flows can result in significant errors.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:ae713383-4e76-43a1-9d11-48f08ae7e66d","http://resolver.tudelft.nl/uuid:ae713383-4e76-43a1-9d11-48f08ae7e66d","Advection models of longitudinal dispersion in rivers","Kranenburg, C.","","1996","A derivation is presented of a general cross-section averaged model of longitudinal dispersion, which is based on the notion of the advection of tracer particles. Particle displacement length and particle travel time are conceived as stochastic variables, and a joint probability density function is introduced to arrive at an integral advection model for the cross-section averaged concentration. Starting from this model special advection models known from the literature are obtained in a consistent way. These models, in which only the travel time is a stochastic variable, predict skewed tracer concentration contributions of the kind observed in the field, but satisfy the condition of approach to Gaussian behaviour for large spreading times. A relationship between the particle displacement length and the longitudinal dispersion coefficient is derived. The application of advection models to non-uniform rivers and the relationship with the dead-zone model are outlined.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:5e46fc03-dde3-4dec-b97a-c00ef4c9dffb","http://resolver.tudelft.nl/uuid:5e46fc03-dde3-4dec-b97a-c00ef4c9dffb","A study on one-dimensional and discontinuous river flows with mobile beds","Sieben, A.","","1995","This report focusses on discontinuous behaviour of hydraulics and morphology in rivers. The varying widths, slopes and bed levels that can be observed in mountain rivers can induce rapid, or discontinuous changes at a short lengthscale. When present, these discontinuities have a major impact on changes in water and bed levels during floods. In this study, existing theories on discontinuous solutions are applied to river flows with mobile beds. The propagation rate and stability of a discontinuity are analysed with the Lax shock-wave criterion. Effects of transitions in flow regime are described qualitatively by solving the Rankine-Hugoniot relations. Attention is paid to the effect of river bed mobility on discontinuous flows.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:e659e47c-740b-4511-9442-f1a2adfdfaeb","http://resolver.tudelft.nl/uuid:e659e47c-740b-4511-9442-f1a2adfdfaeb","Notes on the mathematical modelling of alluvial mountain rivers","Sieben, A.","","1994","The ability of describing and predicting hydraulic and morphological phenomena in mountain rivers is limited, partially due to the limits of deterministic approaches where stochastic effects in sediment supply and water inflow are extremely significant, and partially due to the very specific conditions that can be observed in mountain rivers, that complicate the modelling. The dynamics of morphology and hydraulics of mountain rivers must be known when applying numerical modelling procedures to mountain rivers. Simplifying a complex, nonuniform geometry significantly affects the behaviour of the model at high values of the Froude number. The number and type of boundary conditions to be prescribed at a boundary can change with flow regime. Hydraulic and morphological changes in supercritical flows are coupled and transversal effects are significant. The mathematical models discussed are a single-layer model and a double layer model conform Ribberink (1987). With the help of the characteristics, the models are analysed and compared. Analysing the characteristic surface yields indispensible insight in the twodimensional behaviour of the mathematical models. To prevent the mathematical model from being elliptical, the thickness of the mixing layer has a maximum. This value is investigated, approximated and evaluated. It appears that the behaviour of the model can be significantly affected by the model parameters (hydraulic as well as morphological). Regarding the selection between onedimensional and two-dimensional modelling, it can be concluded that transverse effects have a significant influcence on the behaviour of the model for Froude near unity. Conclusions in this report stress the need for research on the modelling of complex geometry for flow with higher values of Froude and the prediction of the model parameters used (such as mixing-layer thickness and sediment fluxes) at varying flow conditions.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:693de6a8-eefa-48d0-bb18-22ba61988e80","http://resolver.tudelft.nl/uuid:693de6a8-eefa-48d0-bb18-22ba61988e80","Analysis of the transport of a pollution cloud in the Upper-Rhine River between Lake of Constance","Van Kuik, C.A.; Van Mazijk, A.","","1994","In the one-dimensional 'Rhine Alarm Model' differences between the actual travel time of a pollution cloud, originating from an instantaneous release of an accidental spill, and the travel time, based on the flow velocity is represented by a lag coefficient. In the model this lag coefficient is defined by the relative difference between these two travel times. This paper presents the results of a study on the influence of tributaries and suppressed flow by weirs on the lag coefficient in general and on the influence of the River Aare and the suppressed flow by water power stations on this coefficient in the Upper-Rhine River between Lake of Constance and Basel especially. Also the influence of incompletely transversal mixing in the vicinity of the point of release at a river bank as a special case of a polluted tributary is discussed. In the study analytical and numerical approaches were applied. For the numerical approach a two-dimensional transport model of the ""Versuchsanstalt fUr Wasserbau (VAW)"" (Hydraulic Research Institute) of the ETH-Ziirich (Federal University of Technology of Zurich) was used. The main conclusion is that the behaviour of the lag coefficient along the Upper-Rhine River is strongly influenced by sudden increases of the flow velocity at power stations, due to the differences in waterdepth upstream and downstream of the station, and at the Aare-Rhine confluence, due to the large discharge ratio of these river branches. The outcome of these flow-velocity discontinuities is a relatively large negative value of the lag coefficient upstream of the discontinuity and a relatively large positive value downstream. This is because upstream of the discontinuity the transport velocity of the centroid of the pollution cloud is already influenced by the larger flow velocity downstream of the discontinuity as soon as the front of the cloud has passed the discontinuity. Downstream of the discontinuity the transport velocity of the centroid is still influenced by the smaller flow velocity upstream of the discontinuity as long as the tail of the cloud remains upstream of the discontinuity. Case studies on the Upper-Rhine River between Lake of Constance and Basel show good fits of the calibrated values of the lag coefficient in the Rhine Alarm Model with the results of the two-dimensional transport model.","dispersion; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:ff77dce8-19bc-4612-97b1-3464de96e81a","http://resolver.tudelft.nl/uuid:ff77dce8-19bc-4612-97b1-3464de96e81a","River engineering","De Vries, M.","","1993","One dimension models - basic eauations, analytical models, numberical models. One dimensional models -suspended load, roughness and resistance of river beds. Solving river problems - tools, flood mitigation, bank protection.","river engineering; rivers","en","lecture notes","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:a2433bee-65a9-4dee-a7ca-14cbd11be206","http://resolver.tudelft.nl/uuid:a2433bee-65a9-4dee-a7ca-14cbd11be206","Hydraulics and morphology of mountain rivers; literature survey","Sieben, J.","","1993","Present knowledge on fluvial processes in mountain rivers should be expanded to enable the development of projects dealing with mountain rivers or mountain-river catchment areas. This study reviews research on hydraulic and morphological features of mountain rivers. A major characteristic of mountain rivers is the variability of the hydraulic and morphological parameters. Flows can change from extremely non-uniform flow over large roughness elements at low stages to relatively uniform flow at high stages. The irregularity of geometry complicates the modelling of the turbulent, non-uniform and/or unsteady behaviour of water and sediment. It can be concluded that, due to the complexity of the conditions observed, a proper, general description of sediment movements in mountain rivers is not possible yet. Description or prediction of morphological developments at present is limited to exceptionally isolated phenomena. Morphological responses of a river to a flood depend on (i) the size-distribution of the bed material and (ii) the distribution in time and place of hydrographs and sediment supply. The effects and relevancy of extreme hydraulic conditions have to be investigated, to enable description and prediction of long-term morphological evolution. Considering the importance of extreme, and subsequently low-frequency variables, the prospect of theoretical simulation models of morphological processes in mountain rivers seems rather remote.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:13b8565a-9b49-4d35-8897-25b430b5a320","http://resolver.tudelft.nl/uuid:13b8565a-9b49-4d35-8897-25b430b5a320","Use of models for river problems","De Vries, M.","","1993","In Chapter 2 of this report an overview is given on fluvial processes involved in the modelling discussed. Chapter 3 is concerned with scale models, whilst Chapter 4 deals with numerical models. The main problems treated are, firstly, modelling of the water movement, followed by sediment transport and morphology. Attention is also given to the dispersion of dissolved matter and problems associated with ice. The 'tools' for scale models and numerical models are given only little attention. For scale models the tools are instruments and control systems. For numerical models numerical schemes are involved. A good introduction can be found in Vreugdenhil (1989). In Chapter 5 guidance is given on the selection of the type of model for river problems, though this has to be of a general nature.","rivers; hydraulic models; modelling; mathematical models","en","report","Unesco","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:bcb47286-6371-4645-b9ac-0a25cdcb448f","http://resolver.tudelft.nl/uuid:bcb47286-6371-4645-b9ac-0a25cdcb448f","Study of bedform geometry in large rivers","Julien, P.Y.","","1992","","numerieke modellen; numerical modelling; Rijn; Rhein; rivieren; rivers; duinen; dunes; hoogwaterafvoer; flood discharge; beddingvormen; bed forms; Maas; Meuse","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:a53398eb-1b23-491d-8937-b6e450b3a9c3","http://resolver.tudelft.nl/uuid:a53398eb-1b23-491d-8937-b6e450b3a9c3","Interpolatie waterstanden, fase 4","Snoeker, X.C.","","1992","","Nederland; rivieren; rivers; meetnetten; monitoring networks; waterstanden; water levels; modellen; models","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:f5446eb8-d367-41fc-81fa-2083d01a22a7","http://resolver.tudelft.nl/uuid:f5446eb8-d367-41fc-81fa-2083d01a22a7","Levende Rivieren","Helmer, W.; Litjes, G.; Overmars, W.; Barneveld, H.; Klink, A.; Sterrenburg, H.; Janssen, B.","WL Delft; Stroming bv; Bureau Klink; Bureau Meet","1992","Hoe om te gaan met de Nederlandse riveren op een zodanige manier dat de natuur bevorderd wordt.","environment; rivers","nl","report","Wereld Natuurfonds","","","","","","","","","","","","",""
"uuid:bd4a4388-66bd-4711-b761-fa0e3d854274","http://resolver.tudelft.nl/uuid:bd4a4388-66bd-4711-b761-fa0e3d854274","Het interpoleren van waterstanden met WAKFIL","Moll, J.R.","","1991","","kalman-filters; kalman filters; waterstanden; water levels; rivieren; rivers","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:4ca0340f-a5e4-47a4-a346-7c71a7d209d5","http://resolver.tudelft.nl/uuid:4ca0340f-a5e4-47a4-a346-7c71a7d209d5","Modelling of river morphology with non-orthogonal horizontal curvilinear coordinates","Mosselman, E.","","1991","A numerical two-dimensional model for river morphology is extended with bank erosion. The model is formulated in curvilinear coordinates. This allows the use of a boundary-fitted computational grid, suited for rivers with a curved centre-line and a non-uni form width. Dealing with non-homogeneous bank erodibility is shown to require a non-orthogonal coordinate system. This enables the use of simple algebraic grid generators, but complicates the transformed equations. A main feature of the present study is that all coordinate derivatives in the transformed equations are replaced by grid properties that are invariant for grid rotation, such as local grid skewness and grid line divergences. This facilitates the physical interpretation of transformation terms and the estimation of their contribution to the solution. The model is verified by comparing its results with results from the original model, and by comparing computations on nonorthogonal grids with a computation on an orthogonal grid. An examination of the truncation error reveals the importance of a smooth grid point distribution for accuracy.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:0734f459-096b-426b-9020-d9f9a48ddf54","http://resolver.tudelft.nl/uuid:0734f459-096b-426b-9020-d9f9a48ddf54","Simulation of meandering river processes","Crosato, A.","","1990","A simple mathematical model for the simulation of river meandering processes is presented and analysed. The model is schematized as follows: computation of steady-state flow field and riverbed topography; and computation of bank erosion rate as a function of the near-bank hydraulic and morphological properties. The model is linear for the prediction of flow field and river bed topography, while geometrical non-linearities arise from the bank erosion equation. The flow and river bed model is derived by fully coupling flow field, bed topography and sediment transport and it (roughly) accounts for the secondary flow momentum convection.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:a1d108a6-ecf3-46c4-ae67-3eb999c51ab3","http://resolver.tudelft.nl/uuid:a1d108a6-ecf3-46c4-ae67-3eb999c51ab3","A theoretical model for suspended sediment transport in river bends","Talmon, A.M.","","1989","A two dimensional depth-averaged model for the concentration field of suspended sediment in river bend flow is formulated. Transport of suspended sediment in horizontal and vertical directions is modelled. Convection by the main and secondary flow and turbulent diffusion are incorporated. The model is capable of computing the exchange of sediment with the bed-load layer adjacent to the bed. The model is based on the three dimensional convection-diffusion equation formulated in a cylindrical bed following coordinate system. Non-orthogonality of the coordinate system is included. The concentration field is modelled by a first order asymptotic solution of the convection-diffusion equation. The zeroth order contribution to the solution is given by equilibrium shape concentration verticals, the first order contribution is due to the convection by the flow. The result is formulated in depth-averaged variables. The time and length scales of the model are computed. These scales are significantly affected by the choice of reference level, the choice of boundary condition at this level, the suspension parameter and the Chezy coefficient. The model will have to be calibrated and verified by measurements and numerical computations.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:1ca904d1-2b9c-4eb3-ae7c-0e57ba722daf","http://resolver.tudelft.nl/uuid:1ca904d1-2b9c-4eb3-ae7c-0e57ba722daf","Theoretical investigation on discharge-induced river-bank erosion","Mosselman, E.","","1989","Bank erosion is incorporated in one-dimensional and two-dimensional horizontal models for river morphology. The banks are assumed to consist of a fraction of cohesive material, which becomes washload after being eroded, and a fraction of granular material, with the same properties as the material of the bed. The banks are taken to be eroded by discharge flow causing lateral entrainment of lower parts of the banks and near-bank bed degradation, both inducing mass failure of upper parts of the banks. Theoretical analyses are performed in order to reveal the influence of bank erosion on the morphological system. From an analysis of characteristics of the one-dimensional model it is concluded that generally river widths cannot be stabilized by protecting certain carefully chosen bank section~ only, and that computations of river planimetry can be decoupled from the computations of flow and bed topography. A linear analysis of the one-dimensional model is used to clarify the interactions between bank and bed disturbances, whereas a linear analysis of the twodimensional model is used to demonstrate that the input of bank erosion products decreases transverse bed slopes, but hardly influences the wave lengths and damping lengths of flow and bed topography in natural rivers with moderately migrating banks.","morphology; rivers","en","report","TU Delft","","","","","","","","Civil Engineering and Geosciences","","","","",""
"uuid:58bc70ac-2d16-4d9b-907d-b397a3c2544c","http://resolver.tudelft.nl/uuid:58bc70ac-2d16-4d9b-907d-b397a3c2544c","Morphological modelling for rivers with non-uniform flow","Ribberink, J.S.","","1980","In Chapter I a derivation of the equations and an extension of the mathematical model will be carried out. The sediment-mixture is separated in a number of fractions - each with a representative grain size - and the equations describing the sediment-movement are split up for every fraction separately. In order to get some insight in the new model in Chapter 2 a restriction will take place to sediment-mixtures consisting of only two sediment-fractions. As a result only one extra dependent variable viz. the probability of one of the fractions, comes into the equations. Moreover the characteristic directions and relations belonging to the set of partial differential equations will be derived mainly in order to obtain information concerning the time-scales of changes in bedlevel and bedcomposition; also the interaction between these changes and the influence of some determining parameters will be studied. In Chapter 3 specific calculations will be carried out of the characteristic directions and relations and the influence of two possible concepts for a transportformula per fraction is studied. In Chapter 4 four simple applications of the mathematical model for two sedimentfractions are treated. The watermotion is simplified in order to be able to carry out the calculations partly by hand. In Chapter 5 a summary and conclusions are given.","rivers; sedimenttransport; river morphology; non-uniform sand","en","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:f59d8b43-0f3c-4670-8433-7f34c4618d89","http://resolver.tudelft.nl/uuid:f59d8b43-0f3c-4670-8433-7f34c4618d89","Morphological computations for suspended sediment transport: unsteady sediment transport","Kerssens, P.J.M.","Waterloopkundig Laboratorium","1978","The present report gives a description of the mathematical model for suspended sediment transport. The model can be used to simulate the movement of suspended sediment in a two-dimensional (longitudinal and vertical) flow field. It can also be applied to determine bed level changes caused by any human interference in the regime or geometry of a river or estuary. Both for non-uniform and unsteady conditions the morphological behaviour in time can be described. It must be emphasized, however, that the method is restricted to non-cohesive and nearly uniform sediment material. In this report the attention is paid mainly to the sediment diffusion equation, the derivation of the sediment diffusion coefficient, the boundary conditions and the numerical solution method, while some of the computational aspects are described extensively. The derivation of the equations governing the motion of the water and the continuity of the bed-sediment is only briefly dealt with, as this can be found elsewhere, together with the computational method to solve the equations and to compute the bed-level changes. As a conclusion of the present investigation the mathematical model to simulate the morphological behaviour of a stream, described in this report can be considered as a practical tool for many engineering problems. In particular its applicability has already been proved for the computation of sedimentation in trenches with relatively gentle slopes, sand-traps, etc.. Moreover by a verification of the mathematical model on a flume investigation on this subject, the results turned out to be rather reliable. The applicability and reliability of the bed-load model, whose equations and computational method have been used to determine the hydraulic conditions and the bed-level changes, have, however, been shown before.","sediment transport; rivers; suspended material","en","report","Waterloopkundig laboratorium (Deltares)","","","","","","","","","","","","",""
"uuid:e25fd3bd-4aeb-4fcf-bdf3-f15ce8e2b340","http://resolver.tudelft.nl/uuid:e25fd3bd-4aeb-4fcf-bdf3-f15ce8e2b340","Regulation structures","Van Bendegom, L.","","1974","","rivers; river regulation structures; groynes; revetments; weirs","en","report","TU Delft, Department Hydraulic Engineering","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","",""
"uuid:4845c565-9649-4260-bbee-a330c13b9e0b","http://resolver.tudelft.nl/uuid:4845c565-9649-4260-bbee-a330c13b9e0b","Beddingvormen","Wichers Hoeth, A.W.","Deltares","1969","Overview of bed forms (ripples, dunes, etc) in rivers. A literature study regarding bed forms caused by river flow in cohesionless material (sand bed). Bed forms generated by waves and wind are excluded.","bed forms; rivers","en","report","Waterloopkundig Laboratorium (Deltares)","","","","","","","","","","","","",""
"uuid:b6b9f68f-ad44-425f-91e3-67f9946092cc","http://resolver.tudelft.nl/uuid:b6b9f68f-ad44-425f-91e3-67f9946092cc","Lecture notes on ""The Role of Rivers to Mankind""","Berdenis van Berlekom, H.A.","NEDECO","1969","It is the task and target of River Engineering as a profession to provide all the tools for arriving at an optimum utilization of the potential resources, optimum in the sense of promoting the beneficial characteristics of the river and eliminating or at least checking the adverse qualities. To strive for this aim, there must be a scientific understanding of the complex pattern of natural forces that exert their influence; a general knowledge on what we call the phenomenon ""River"". These lecture notes try to provide this understanding. In specific, it will provide insight into the following subjects related to the ""River"": - The river's functions - The longitudinal profile - (In)dependent variables in the river valley - Water movement - Sediment movement - Bed formation in a straight river - Cross-sections of a river in a bend - Features of cross-sections in a long narrowed section - Rivers under natural conditions Furthermore, the lecture notes include some improvement schemes in which improvements are described step-by-step. This section especially focuses on regulation and normalization.","morphology; rivers; river engineering; river regulation; river management; river profile; hydraulics; river processes","en","report","Polish Academy of Sciences Institute of Hydro-Engineering, Gdańsk","","","","","","","","","","","","Selected Problems from the Theory of Simulation of Hydrodynamic Phenomena",""
"uuid:e3a97534-e3da-4970-a074-5e9db6c89b33","http://resolver.tudelft.nl/uuid:e3a97534-e3da-4970-a074-5e9db6c89b33","Discussion of bedload movement formulas of Kalinske, Einstein and Meyer-Peter and Müller and their application to recent measurements of beload in the rivers in Holland","Frijlink, H.C.","Thomas, C.W. (contributor); TU Delft","1952","Overview of sediment transport formulas and comparison with measurements in Waal and Rijn river in the Netherlands.","sediment transport; rivers; river morphology","en","report","US Bureau of Reclamation","","","","","","","","","","","","",""
"uuid:aa740bb8-3fab-4296-b3db-b28526980f2f","http://resolver.tudelft.nl/uuid:aa740bb8-3fab-4296-b3db-b28526980f2f","De Rijn-Maasmond (Helinium) in de Romeinse tijd","van Veen, J.","","1951","Bepaling van de oude ligging van de mond van de Rijn aan de hand van boringen in dit gebied op basis van de aanwezigheid van veen in de boorkernen.","estuaria; rivers","nl","report","KNAG","","","","","","","","","","","","","52.179315, 4.446321"