"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:92d79aa9-65fe-4a5d-82ec-c7a3e690c3df","http://resolver.tudelft.nl/uuid:92d79aa9-65fe-4a5d-82ec-c7a3e690c3df","Evaluation and validation of the spectral linear wave theory and ‘traditional’ formulae for pulsating wave loads for unimodal and bimodal seas: Comparison to Goda and measurements","Tuin, Henry (ARCADIS Nederland); Voortman, Hessel (Hessel Voortman Engineering consultancy); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); de Almeida Sousa, E. (TU Delft Hydraulic Structures and Flood Risk; ARCADIS Nederland)","","2022","For the design of vertical hydraulic structures pulsating wave forces need to be calculated. The total wave force is a result of every wave component (long waves and short waves) within a wave field. The common formulae are derived for regular or unimodal narrow sea states and use one characteristic wave height and period. Broad-banded spectra like bimodal sea states are present at many locations. Moreover, new hydraulic structures like Panamax or post-Panamax locks do have a large vertical surface exposed to pulsating wave loads. Swell components within the wave spectrum are disproportionally contributing to the total wave force compared to short waves. This depth effect for broad-banded or bimodal wave spectra is not considered by the traditional wave formulae which could result in significant underestimations of wave forces on hydraulic structures.
This paper aims to determine the wave loads of irregular non-breaking wave fields under any wave spectrum: narrow banded, broad-banded, or bimodal. Spectral linear wave theory (LWT) is used to transform any wave spectrum to a wave force spectrum. The wave force or wave pressure at any level can directly be evaluated from the wave force spectrum or wave pressure spectrum for any shape of the wave spectrum considered within this research. Spectral LWT is compared to the outcome of wave flume experiments with bimodal seas and other wave force formulae, like the Goda formula and quasi-regular LWT and the NewWave theory.
This paper gives a description and evaluation of the spectral LWT applied for bimodal wave spectra and a comparison of the accuracy and validity of other wave force formulae. The peak forces and peak pressures distribution obtained by spectral wave theory compare well to the measurements. It appears that the use of a spectral LWT to obtain characteristic extreme forces improves the accuracy of the extreme load more than the use of a second order wave model with a quasi-regular assumption (i.e. where the spectral shape is not considered). For the typical conditions that occur at hydraulic structures (horizontal bed, intermediate to deep water, non-breaking, and uni- and bimodal seas) the often-used Goda formula can both under of overestimate the peak loads. Goda is well applicable for conditions with (breaking) waves narrow wave spectra and values of kph <0.5.","Spectral Linear wave theory; Linear Wave Theory; New Wave; wave spectrum; wave force spectrum; bimodal spectrum; significant wave force","en","journal article","","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:4640791b-75cb-4c7c-a1d5-24a792818548","http://resolver.tudelft.nl/uuid:4640791b-75cb-4c7c-a1d5-24a792818548","Numerical Evaluation of Design Rules for Non-Breaking Wave Loads on Vertical Walls","van Vledder, G.P. (TU Delft Environmental Fluid Mechanics; Van Vledder Consulting); Hofland, Bas (TU Delft Hydraulic Structures and Flood Risk); Tuin, Henry (ARCADIS Nederland); van Maris, Bob (Student TU Delft)","Goseberg, Nils (editor); Schlurmann, Torsten (editor)","2019","This paper describes a numerical evaluation of design rules for the determination of wave loads of non-breaking waves on vertical structures. Design guidelines were proposed by Sainflou (1928) and Goda (1974). These guidelines use geometric parameters of the structure, an incident wave height and a wave period. In practice (cf. CERC, 1984), a Rayleigh distribution of individual wave heights is assumed to determine the design wave height in an irregular wave field. Their reliability and range of applicability are poorly known, especially when the incident wave condition consists of a mixed sea state, like a local wind sea and a low-frequency (swell) component. To validate the above described design methods, we applied the non-hydrostatic numerical wave model SWASH to simulate wave loading on a rigid vertical wall for single and mixed sea states. In addition, we compared the results with linear wave theory and the spectral response approach using transfer functions based on linear wave theory.","Wave load; vertical structures; Goda; Sainflou; SWASH; force spectrum; linear wave theory","en","conference paper","Bundesanstalt für Wasserbau","","","","","","","","","","Hydraulic Structures and Flood Risk","","",""
"uuid:0ca37201-a0fc-47b4-994f-f3dbf2de8698","http://resolver.tudelft.nl/uuid:0ca37201-a0fc-47b4-994f-f3dbf2de8698","Extending the Link Transmission Model with general concave fundamental diagrams and capacity drops","van der Gun, J.P.T. (TU Delft Transport and Planning); Pel, A.J. (TU Delft Transport and Planning); van Arem, B. (TU Delft Transport and Planning)","","2015","","Link Transmission Model; kinematic wave theory; first-order model; capacity drop; moving jam","en","conference paper","","","","","","","","","","Transport and Planning","Transport and Planning","","",""
"uuid:f17280e8-188c-42cb-9d57-a8239a46b93a","http://resolver.tudelft.nl/uuid:f17280e8-188c-42cb-9d57-a8239a46b93a","Buckling Analysis of Grid-Stiffened Composite Shells","Wang, D.; Abdalla, M.M.","","2014","There is a renewed interest in grid-stiffened composite structures; they are not only competitive with conventional stiffened constructions and sandwich shells in terms of weight but also enjoy superior damage tolerance properties. In this paper, both global and local structural instabilities are investigated for grid-stiffened composite panels using homogenization theory. Characteristic cell configurations with periodic boundary constraints are employed for orthogrid- and isogrid-stiffened shells in order to smear the stiffened panel into an equivalent unstiffened shell. Homogenized properties corresponding to classical lamination theory are obtained by matching the strain energy of the stiffened and equivalent cells. Global buckling analysis is carried out based on the homogenized shell properties. Bloch wave theory is adopted to calculate the local buckling load of grid-stiffened shells, where the interaction of adjacent cells is fully taken into account. Moreover, instead of considering skin buckling and stiffener crippling separately, as is commonly done, the skin and stiffeners are assembled together at the level of the characteristic cell. The critical instabilities can be captured whether they are related to the skin or stiffener or their interaction. The proposed combination of global/local models can also be used to predict the material failure of a structure. Numerical examples of orthogrid- and isogrid-stiffened isotropic panels show that the local buckling loads predicted by the proposed method match finite element calculations better than semi-analytical methods based on assumptions and idealisations. The proposed method is further validated using typical configurations of flat composite panels and circular composite cylinders.","buckling; grid-stiffened structures; composite; homogenization techniques; Bloch wave theory","en","conference paper","CIMNE","","","","","","","","Aerospace Engineering","Aerospace Structures & Materials","","","",""
"uuid:0f154350-46b9-452a-9b11-75103b60f574","http://resolver.tudelft.nl/uuid:0f154350-46b9-452a-9b11-75103b60f574","Numerical modelling of ship-induced water motions: Feasibility and validation study","Verheij, H.J.; Raven, H.C.; Doorn, N.; Borsboom, M.J.A.; Lambeek, J.J.P.","","2001","","stromingsmodellen; flow models; numerieke modellen; numerical modelling; golftheorie; wave theory","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:011694ee-394b-44f5-9866-981513bdd780","http://resolver.tudelft.nl/uuid:011694ee-394b-44f5-9866-981513bdd780","A new vertical approximation for the numerical simulation of non-hydrostatic free surface flows","Stelling, G.S.; Kester, J.A.T.M. van","","2000","","hydrodynamica; hydrodynamics; interpolatie; interpolation; numerieke modellen; numerical modelling; golftheorie; wave theory","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:b9d225e6-2804-4fec-ac85-c510c7bd8880","http://resolver.tudelft.nl/uuid:b9d225e6-2804-4fec-ac85-c510c7bd8880","Numerical modelling of ship-induced water motions: Feasibility study","Verheij, H.J.; Raven, H.C.; Doorn, N.; Borsboom, M.J.A.","","2000","","stromingsmodellen; flow models; numerieke modellen; numerical modelling; golftheorie; wave theory","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:3e7728ad-b2ac-480f-94f5-7f657fe90ce3","http://resolver.tudelft.nl/uuid:3e7728ad-b2ac-480f-94f5-7f657fe90ce3","Effect of Wave-Current Interaction on the Wave Parameter","Li, Y.C.; Herbich, J.B.","TU Delft","1982","The interaction of a gravity wave with a steady uniform current is discussed in this paper. Analysis indicates there is no dominant difference in the results obtained when employing either the equation of conservation of wave energy flux or the equation of conservation of wave action flux. Numerical calculations of the wave length change by different non-linear wave theories show that errors in the results computed by the linear wave theory are less than 10 percent within the range of 0.15 <= d/Ls <= 0.40, 0.01 <= Hs/Ls <= 0.07 and -0.15 <= U/Cs <= 0.30, where d = water depth, Hs = wave height in still water, Ls = wave length in still water, Cs = wave celerity in still water, and U = surface current velocity. Numerical calculations of wave height change employing different wave theories show that errors in the results obtained by the linear wave theory in comparison with the non-linear theories are greater when the opposing relative current and wave steepness become larger. However, within range of the following currents such errors will not be significant. These results were verified by model tests. Nomograms for the modification of wave length and height by the linear wave theory and Stokes' third order theory are presented for a wide range of d/Ls, Hs/Ls and U/Cs. These nomograms provide the design engineer with a practical guide for estimating wave lengths and heights affected by currents.","wave-current interaction; non-linear wave theory; numerical calculations; nomograms; linear wave theory","en","report","Texas Engineering Experiment Station","","","","","","","","","","","","Ocean Engineering Program",""
"uuid:ebf2c3e9-b56f-4388-81f3-d894c285b3f5","http://resolver.tudelft.nl/uuid:ebf2c3e9-b56f-4388-81f3-d894c285b3f5","GOLVEN, GOLFPL, TABTHE: Programma's voor berekenen golfwaarden met verschillende theorieën : gebruikershandleiding","Verhage, L.","","1980","","golftheorie; wave theory; computerprogramma's; software","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:cac91c43-1a31-4472-8b63-11b9eec83d76","http://resolver.tudelft.nl/uuid:cac91c43-1a31-4472-8b63-11b9eec83d76","GOLVEN, GOLFPL, TABTHE: Programma's voor berekenen golfwaarden met verschillende theorieën : I/O-overzicht","Verhage, L.","","1980","","golftheorie; wave theory; computerprogramma's; software","nl","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:49802a3d-dd05-4319-b4bc-a8d2d986bfc1","http://resolver.tudelft.nl/uuid:49802a3d-dd05-4319-b4bc-a8d2d986bfc1","A numerical comparison of some water-wave theories: Report on investigation","Voogt, W.J.P. de","","1979","","golftheorie; wave theory","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:70bedf90-bae7-4ff1-b691-10977a1fa312","http://resolver.tudelft.nl/uuid:70bedf90-bae7-4ff1-b691-10977a1fa312","An evaluation of some wave theories","Dingemans, M.W.; Vis, F.C.","","1978","","golftheorie; wave theory","en","report","Deltares (WL)","","","","","","","","","","","","",""
"uuid:557c1857-e54a-4ad7-a684-5c2a965331f6","http://resolver.tudelft.nl/uuid:557c1857-e54a-4ad7-a684-5c2a965331f6","A higher order theory for deep water waves","Monkmeyer, P.L.; Kutzbach, J.E.","TU Delft","1965","The classical problem of describing the characteristics of deep water waves of finite amplitude is considered. The method of analysis initially follows that of Nekrasov, but differs in that a non-linear algebraic equation is derived. This equation is solved to the third, fifth and fifteenth order by means of a digital computer and the data is presented in tabular form. Expressions for the wave speed and wave shape, predicted by the analysis, are compared with the results obtained by Stokes. The highest wave in water is also discussed.","waves; wave theory; Stokes theory","en","report","ASCE","","","","","","","","","","","","",""
"uuid:bea93b90-00a0-4d09-9b24-624f68244e20","http://resolver.tudelft.nl/uuid:bea93b90-00a0-4d09-9b24-624f68244e20","Contribution to the Theory of Internal Waves","Groen, P.","Rijkswaterstaat","1948","The behaviour of internal waves in vertically inhomogeneous fluids has been studied theoretically by various authors, from the point of view of general hydrodynamics as well as of meteorology and of physical oceanography (see the list of references, which, however, is not meant to be complete). For mathematical reasons most of them assumed discontinuities at certain levels, either in the density or in its first derivative with respect to the vertical coordinate, z. Any transition layer was often assumed to be thin in comparison with the wave length. FJELDSTAD [7], on the other hand, by using numerical integration, succeeded in giving an.approximate method of solving the problem for certain general density-distributions, such as may actually occur in the sea, a method, however, which is only applicable for very long waves. Besides this restriction to long waves only, FJELDSTAD's method has one other disadvantage, viz. of not directly yielding general rules or relations between the properties of the internal waves and certain parameters of the density-distribution. It is therefore, that we have gone back to somewhat more special density distributions, which are perfectly continuous with respect to the density and its first derivative to z (as are FJELDSTAD's density-distributions), but which appear to be capable of an analytical treatment; furthermore, the results are also valid for small wavelengths. In the present paper we deal only with fluids extending to infinity both upwards and downwards. At first sight this seems rather unrealistic. We know, however, that the wave-motions are always confined to a certain layer, above and below which they are negligibly small, so that, if only the boundaries of the fluid fall without this layer, they will not interfere essentially with the solutions we shall find here. The thickness of this layer depends on the wave length (see section 5). . For the rest, it is quite possible to introduce a free surface and a rigid bottom, if necessary. This will make the computations much more complicated and laborious, however.","internal waves; wave theory; density distribution; waves; mathematical modelling; Fjeldstad","en","report","KNMI","","","","","","","","","","","","",""