The applicability of SWASH model for wave transformation and wave overtopping: A case study for the Flemish coast (original) (raw)

A Comparison of Empirical, Semiempirical, and Numerical Wave Overtopping Models

Journal of Coastal Research, 2008

REIS, M.T.; HU, K.; HEDGES, T.S., and MASE, H., 2008. A comparison of empirical, semiempirical, and numerical wave overtopping models. Journal of Coastal Research, 24(2B), 250-262. West Palm Beach (Florida), ISSN 0749-0208.

COMPARISON OF NUMERICAL MODELS FOR WAVE OVERTOPPING AND IMPACT ON A SEA WALL

Coastal Engineering Proceedings, 2014

The paper discusses three different numerical models in a study of wave overtopping and impact on a sea wall. The models used are SWASH (based on the nonlinear shallow water equations), DualSPHysics and FLOW-3D (both based on the full Navier-Stokes equations). The models are validated against experimental measurements in a setup with a quay wall and berm in front of the sea wall. The two models based on the full Navier-Stokes equations provide good estimates of the wave impact on the sea wall. Moreover, reasonable agreement with experimental values of averaged overtopping discharges was found for the full test time series simulated with FLOW-3D. Notwithstanding the SWASH model provides reasonable estimates for the wave overtopping on a simple quay wall, at a significantly lower computational cost than the other two models, it clearly underrates the overtopping discharge in the case of a combination of a quay wall, berm and sea wall. Further investigation is needed to draw conclusions on the model accuracy of SWASH in such a case.

Van Doorslaer et al. REDUCTION OF WAVE OVERTOPPING: FROM RESEARCH TO PRACTICE

The present paper shows the purpose, the test results and the practical implementation of two innovative crest designs, based on scale model test with mainly non-breaking waves. First, the parapet and its geometrical parameters are shown. Second, the reduction of a dike with stilling wave basin is presented. Both crest designs will be built along the Belgian coast in order to fulfill current and anticipate future safety norms. Alternatives and/or performance are discussed within the present paper. INTRODUCTION To ensure the safety in Belgian coastal regions now and in the future (up to 2050, including the sea level rise) a Coastal Safety Plan 3 is being worked out, in which is declared that cities near the coastline have to be protected against storms with a return period of 1000 year (which is a minimal acceptable protection level). If this storm would appear now, theoretical and physical models have shown that the safety of one third of the Belgian coastal zone is insufficient. Su...

Wave overtopping of a typical coastal structure of the Portuguese coast using a SPH model

Journal of Coastal Research

DIDIER, E. and NEVES, M.G., 2009. Wave overtopping of a typical coastal structure of the Portuguese coast using a SPH model. Journal of Coastal Research, SI 56 (Proceedings of the 10th International Coastal Symposium), 496 – 500. Lisbon, Portugal, ISSN 0749-0258. Smoothed Particle Hydrodynamics (SPH) method is a mesh-free, Lagrangian, particle method for modeling free-surface flows. The potential range of applications is very wide (waves, impact on dams, offshore...) as the mesh-free technique facilitates the simulation of highly distorted fluids/bodies, whereas Eulerian methods can be difficult to apply. Models based on SPH are an option to address coastal processes, particularly the interaction between waves and coastal structures, i.e. wave overtopping, that is a practical problem in coastal engineering. It involves complicated free surface deformations and SPH model is an ideal approach to simulate such a process. The paper presents an engineering application of SPH model to def...

Simulation of random wave overtopping by a WCSPH model

Applied Ocean Research, 2021

In this work the Weakly Compressible SPH-based (WCSPH) model DualSPHysics has been validated and applied to study the random wave overtopping of dike-promenade layout in shallow water conditions. Data from physical model tests carried out in a small-scale wave flume have been used for model validation. The results have been compared in terms of water surface elevation, mean discharges and individual overtopping volumes distribution. The selected geometrical layout is representative of the coastal area of Premià de Mar, in Catalonia (Spain). This stretch of the coast presents both railways and a bike path very close to the shore and therefore exposed to possible sea storms. For the first time an SPH-based model has been employed to reproduce long-lasting wave overtopping tests, made of time series of 1000 irregular waves, which are representative of real sea states. The density diffusion scheme and the modified Dynamic Boundary Conditions have been applied in the present simulations. By employing standard setup for SPH modelling of wave-structure interaction problems of a very long duration, stable simulations and accurate results have been attained.

A generic and practical wave overtopping model that includes uncertainty

Proceedings of the Institution of Civil Engineers - Maritime Engineering

Mean wave overtopping discharge is generally accepted to be a primary design criterion for assessing the performance of coastal structures. It is a boundary condition for many coastal flood risk assessments. Modern methods for assessing wave overtopping discharges and their consequences are well documented and reported. Among the various tools available for assessing wave overtopping, the use of artificial neural networks has become increasingly popular. This paper introduces the next stage in the development of these models. Using the same source data, the new generic meta-modelling overtopping model reduces uncertainties and gives clear guidance on the range and validity of the outputs. Keywords coastal engineering/hydraulics & hydrodynamics/risk & probability analysis Notation A generic and practical wave overtopping model that includes uncertainty Tim Pullen et al. HRPP777 2 2 a positive universal scale factor used in constructing the covariance matrix for the Gaussian process minimum period of an periodic input variable 1 , 2 , … correlation lengths used in constructing the covariance matrix for the Gaussian process, one for each of the input variables

THE INTERNATIONAL DATABASE ON WAVE OVERTOPPING

Coastal Engineering 2004 - Proceedings of the 29th International Conference, 2005

One of the main objectives within the EU-project CLASH (www.clash-eu.org) was to create a generic prediction method for wave overtopping at coastal structures by means of the Neural Network technique. An extensive and homogeneous database on wave overtopping was set up within CLASH, mainly with the aim to be used for the training process of the Neural Network (NN). A total number of 10,532 tests from 163 independent test series were screened and included in the database. The final database consists of far more information than needed for the training of the NN: 31 parameters are included to describe each overtopping test of which only 17 are used for the NN development. This explains the possible use of the overtopping database on its own. Plotting various parameters of the database together in graphs gives a clear view on the contents of the database. Also the ranges covered by the parameters can be detected in this way. The creation of the database, the analysis of the database, and the possible use of the database on its own are described in this paper.

Wave overtopping in harbour areas

2017

Wave overtopping in harbour areas is a fairly untreated topic in the context of flood risk analyses. Pragmatic approaches were undertaken to evaluate the possible influence of wave overtopping on the frequency of flooding. However no consensus was reached on how wave overtopping in a harbour area could be quantified. Therefore it is also difficult to determine whether wave overtopping should be accounted for in a flood risk assessment or not. This master thesis seeks to find an answer on the question which method is best suitable to quantify wave overtopping in harbour areas. Along the way it is studied which wave processes play a role and how available models take into account these processes. Subsequently a choice for a certain method or model can be made. Using this approach the question whether the effect wave overtopping might be significant in a flood risk analysis is answered. At first a theory study is undertaken which consists of two parts. The first part examines the theor...