Development of a quasi 2-DH model for numerical modeling of shoreline changes

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2021-2-15

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Özsoy, Can

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The scope of this thesis is to develop a quasi-2-dimensional numerical model to numerically modeling shoreline response under wave action in the vicinity of various coastal defense implementation. The developed quasi-2-dimensional model is applicable in both the medium and the long term. The model is utilizing a spectral wave model, which solves the energy balance equation. Longshore sediment transport is solved through the bulk sediment transport formula, and it is distributed over the surf-zone. The aim is to develop an accurate sediment transport model combining a spectral wave model with directly computed sediment transport expressions without prolonging computation time. The model consists of cross-shore and swash zone sand transport for maintaining an equilibrium profile. The developed quasi-2-dimensional numerical model is compared with theoretical cases and validated through Gravens and Wang’s (2007) laboratory experiments. For theoretical cases, beach cusps, model’s scope of cross-shore sediment transport, and a single groin case investigated. Moreover, series of experimental results in an offshore breakwater’s vicinity are compared with the model results for laboratory experiments. In initial cases of laboratory experiments, the model successfully represents both the shoreline and the areal changes. As the shoreline advances through the offshore breakwater and tombolo starts to form, incoming wave and local orientation angles start to increase; the model results deviate from laboratory measurements.

Subject Keywords

Sediment transport, Shoreline change model, Quasi-2DH

URI

https://hdl.handle.net/11511/90803

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. Özsoy, “Development of a quasi 2-DH model for numerical modeling of shoreline changes,” M.S. - Master of Science, Middle East Technical University, 2021.