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• W628612910 abstract "Present strategies for coastal defence in the Dutch coast are mainly focused on conventional solutions such as revetments, dunes, dikes, groynes as well as on beach nourishment. No attention has so far been paid to the implementation of Offshore Breakwaters. An offshore breakwater is a shore parallel structure which is constructed seperately from the shore. The main drawback in implementing offshore breakwaters as a coastal defence measure is the nonavailability of proper methodologies to predict the morphological response in the presence of interdepending different combinations of boundary parameters. Even the very few available prototype experiences of other countries can not be adopted blindly to the Dutch coast as they are very country specific and site specific. Numerical models have become increasingly important in the prediction of waves, currents, sediment transport and shore evolution. The current study is aimed at finding the applicability and limitation of numerical models and at reeommending an appropriate procedure to employ such models to simulate morphological changes due to offshore breakwaters. The selected study area is in the vicinity of Scheveningen. Research work is carried out in two phases viz. with the one dimensional model UNIBEST,and the two dimensional model MIKE21.Much attention is devoted to represent the strong tidal influence which is a dominating characteristic feature in the Dutch coast. In case of one dimensional (ID) modelling, the objectives are achieved through the development of a set of graphs indicating the variation of sediment transport rates under different boundary condition parameters such as waves, tide, structure geometry and changes in coastline orientation. The results are presented in graphical form with dimensionless parameters, where applicable. MIKE21simulations are carried out with two selected offshore structural layouts under some selected boundary conditions to assess the hydrodynamic and morphodynamic behaviour. UNIBESTresults indicate the presence of an optimal structure height which maximizes the sediment transport. The results also gave some doubts about the correctness of the formula used for wave transmission calculations. The most dominating wave directions are found to he West and North. In spite of the limitations of UNIBEST(such as the inability to include the wave diffraction effects and the spatial distribution of hydrodynamic and morphodynamic phenomena resulting from the introduetion of offshore structures), the programme is found to be efficient in terms of cost and computational effort. It can effectively be utilized to get an insight into the behaviour of boundary parameters at a preliminary stage of an investigation. Apart from the heavy involvement of computational efforts, MIKE21is found to be a very capable tool in simulating the spatial distribution of flow fields and wave diffraction effects. Applicability is found to be reasonably acceptable as phenomenas such as formation of eddies and transport pattems reassembling the formation of salients/tombolos could be observed in the output results. The result of the study is, among others, a recommended procedure which outlines the use of UNIBESTat a preliminary stage to identify the most crucial boundary parameters in the morphological process and of employing MIKE21to investigate such selected conditions in detail. In this way, a compromise could be achieved between cost, computational effort and relatively high accuracies." @default.
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• W628612910 date "1996-07-23" @default.
• W628612910 modified "2023-09-26" @default.
• W628612910 title "Applicability of numerical models in simulating morphological changes due to offshore breakwaters" @default.
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