Searched for: author:"Uijttewaal"
(21 - 40 of 97)

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Truong Hong, S. (author), Uijttewaal, W.S.J. (author), Stive, M.J.F. (author)
Mangrove forests along the Mekong delta estuaries are usually observed to degrade together with the increasing extension of fish farms. In this limited-width condition, the formation of coherent structures, their interactions with mangroves, the role of the width of the mangrove forest, and their effects on the exchange processes between the...
journal article 2019
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Alhaddad, S.M.S. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)
Recent studies have revealed that breaching, rather than liquefaction, is the dominant failure process in underwater slopes of fine sand and the main driver of observed flow slides in nature. As a result, breaching is getting more attention from hydraulic and geotechnical researchers. Measurements of breaching-generated turbidity currents are...
conference paper 2019
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Haidari, A.H. (author), Heijman, Sebastiaan (author), Uijttewaal, W.S.J. (author), van der Meer, W.G.J. (author)
Feed spacer orientation affects the velocity pattern and pressure drop of spacer-filled channels such as those encountered in Spiral-wound Membrane (SWM) modules of Reverse Osmosis (RO). However, there are only limited numbers of experimental studies on this topic. This study sets out to reveal more detailed information on the pressure drop...
journal article 2019
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Jacobsen, Niels G. (author), Bakker, Wout (author), Uijttewaal, W.S.J. (author), Uittenbogaard, Rob (author)
The work presents an experimental investigation into the motion of and hydrodynamic forces along a single flexible stem in regular waves. The experiment covers a large range in relevant non-dimensional parameters: the drag-to-stiffness ratio, the inertia-to-stiffness ratio, the Keulegan-Carpenter number and the Reynolds number. The two first...
journal article 2019
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Verbeek, M.C. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)
Coastal infrastructure, such as bridges and storm surge barriers with weirs, provides an attractive location for harvesting renewable energy using tidal turbines. Often stone layers are applied downstream of coastal infrastructure to protect the sea bed from erosion. However, little is known about the potential effect of tidal energy extraction...
conference paper 2019
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Broekema, Y.B. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)
Flow separation and its control have been the subject of intensive research for decades. Flow separation occurs when the boundary layer loses contact with the associated confining wall, which is usually caused by a pressure gradient acting against the local flow direction. Numerous strategies exist to control flow separation, and in this...
journal article 2019
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Wei, P. (author), Mudde, R.F. (author), Uijttewaal, W.S.J. (author), Spanjers, H. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)
This study aimed to characterise the gas-liquid flow and mixing behaviour in a gas-mixed anaerobic digester by improving phase interaction modelling using Computational Fluid Dynamics (CFD). A 2D axisymmetric model validated with experimental data was set up using an Eulerian-Eulerian method. Uncertainty factors, including bubble size, phase...
journal article 2019
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Duro, G. (author), Crosato, A. (author), Kleinhans, Maarten G. (author), Winkels, Timotheus G. (author), Woolderink, Hessel A.G. (author), Uijttewaal, W.S.J. (author)
Distinct bankline patterns appeared after the removal of protection works along a navigable reach of the Meuse River. A series of oblique embayments now dominate the riverine landscape after ten years of bank erosion, but their location and asymmetry cannot be explained yet. This work analyses and integrates field measurements of flow, ship...
journal article 2019
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Vargas-Luna, Andrés (author), Duro, G. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)
While the scientific community has long recognized that alluvial rivers are the product of interactions between flowing water and bed material transport, it is increasingly evident that vegetation mediates these interactions and influences the stream channel characteristics. In a novel set of mobile bed laboratory experiments with variable...
journal article 2019
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Gutiérrez, Juan Pablo (author), van Halem, D. (author), Uijttewaal, W.S.J. (author), del Risco, Efraín (author), Rietveld, L.C. (author)
As a consequence of the suspended sediments in river water, cake formation on the streambed and clogging of the aquifer may occur, leading to a decline in the production yield of riverbank filtration systems, particularly in highly turbid river waters. However, naturally occurring flow forces may induce sufficient scouring of the streambed,...
journal article 2018
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Chen, Hui (author), Ni, Yan (author), Li, Yulong (author), Liu, Feng (author), Ou, Suying (author), Su, Min (author), Peng, Yisheng (author), Hu, Zhan (author), Uijttewaal, W.S.J. (author), Suzuki, T. (author)
Coastal vegetation is efficient in damping incident waves even in storm events, thus providing valuable protections to coastal communities. However, large uncertainties lie in determining vegetation drag coefficients (C<sub>D</sub>), which are directly related to the wave damping capacity of a certain vegetated area. One major uncertainty is...
journal article 2018
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Oudenbroek, Kevin (author), Naderi, Nader (author), Bricker, J.D. (author), Yang, Y. (author), van der Veen, C. (author), Uijttewaal, W.S.J. (author), Moriguchi, Shuji (author), Jonkman, Sebastiaan N. (author)
In countries with steep rivers, such as Japan and the United States, bridges fail on an annual basis. Bridges on spread footings are especially susceptible to failure by hydrodynamic loading, often exacerbated by debris damming. Here, such failures are investigated via small scale model laboratory experiments and full scale numerical...
journal article 2018
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Duro, G. (author), Crosato, A. (author), Kleinhans, Maarten G. (author), Uijttewaal, W.S.J. (author)
We apply structure from motion (SfM) photogrammetry with imagery from an unmanned aerial vehicle (UAV) to measure bank erosion processes along a mid-sized river reach. This technique offers a unique set of characteristics compared to previously used methods to monitor banks, such as high resolution and relatively fast deployment in the field....
journal article 2018
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Wei, P. (author), Tan, Qiuman (author), Uijttewaal, W.S.J. (author), van Lier, J.B. (author), de Kreuk, M.K. (author)
For a proper operational performance assessment of excess sewage sludge digesters in practice, a better understanding of waste activated sludge (WAS) rheological behaviour is important, especially regarding the low-shear and poor mixing zones in anaerobic digesters. The potential rheological instability of WAS with different total solids (TS)...
journal article 2018
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Hong Son, Truong (author), Uijttewaal, W.S.J. (author)
Vegetation in general and mangrove, in particular, plays a significant role in the protection of the coastal and estuarine regions from erosion. In particular, estuarine mangrove forests can effciently reduce the impact of a strong along-bank flow during high tides and high river discharge, creating shelter regions for the development of the...
journal article 2018
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Vargas Luna, A. (author), Crosato, A. (author), Byishimo, P. (author), Uijttewaal, W.S.J. (author)
Alluvial rivers are shaped by sequences of water flows excavating their channels. Observations show that besides the magnitude, also the frequency and duration of streamflow oscillations might be important for the river channel formation. In addition, the river morphology appears influenced also by both size and degree of uniformity of the...
journal article 2018
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Duro, G. (author), Crosato, A. (author), Kleinhans, Maarten (author), Uijttewaal, W.S.J. (author)
In recent years, many riverbanks in Europe had their protections removed to reactivate natural erosion processes and improve riparian habitats. Yet, other river functions may be affected, such as navigation and flood conveyance. The quantification and prediction of erosion rates and volumes is then relevant to manage and control the integrity...
journal article 2018
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Vargas-Luna, Andrés (author), Crosato, A. (author), Byishimo, Protogene (author), Uijttewaal, W.S.J. (author)
Alluvial rivers are shaped by sequences of water flows excavating their channels. Observations show that besides the magnitude, the frequency and duration of streamflow oscillations might also be important for the river channel formation. In addition, the river morphology appears influenced by both size and degree of uniformity of the...
journal article 2018
document
Broekema, Y.B. (author), Labeur, R.J. (author), Uijttewaal, W.S.J. (author)
Scour in the vicinity of a hydraulic structure may compromise its geotechnical stability or that of nearby structures. Much fundamental research has been dedicated to the understanding and prediction of these processes, in order to enable the efficient design of mitigation measures. While most of these efforts consider laterally uniform flows,...
journal article 2018
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Le, T.B. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)
Rivers have been trained for centuries by channel narrowing and straightening. This caused important damages to their ecosystems, particularly around the bank areas. We analyse here the possibility to train rivers in a new way by subdividing their channel in main and ecological channel with a longitudinal training wall. The effectiveness of...
journal article 2018
Searched for: author:"Uijttewaal"
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