ICCE 2022

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INVESTIGATION OF DIRECTIONAL SPREADING EFFECT ON WAVE RUN-UP USING SWASH. (2023). Coastal Engineering Proceedings, 37, currents.6.


In order to keep optimal safety of coastal lines, it is necessary to maintain an appropriate crest level of coastal dikes. This is designed based on wave run-up height and/or wave overtopping discharge. Therefore, it is important to estimate wave run-up and overtopping as accurate as possible. However, the influence of directional spreading on wave run-up and overtopping has not been fully understood yet. In this study, non-hydrostatic model SWASH (Zijlema et al., 2011) is used. First, we implemented a wave run-up model in SWASH in 2DV (flume like) and 3D (basin like). Then wave run-up are simulated for some different cases and compared to the existing empirical wave run-up formulas in literature (e.g. Holman, 1986 and Mase, 1989).


Altomare, Suzuki, Verwaest (2020): Influence of directional spreading on wave overtopping of sea dikes with gentle and shallow foreshores. Coastal Engineering, ELSEVIER, 157: 103654.

Fiedler, Smit, Brodie, McNinch, Guza (2018): Numerical modeling of wave runup on steep and mildly sloping natural beaches, 131. Coastal Engineering, ELSEVIER, 106–113 pp.

Guza and Feddersen (2012): Effect of wave frequency and directional spread on shoreline runup. Geophysical research letters, vol. 39, L11607.

Holman (1986): Extreme value statistics for wave run-up on a natural beach. Coastal Engineering, ELSEVIER, 9: 527—544.

Mase (1989): Random wave runup height on gentle slope. J.Waterw. Port Coast. Ocean Eng. 115(5): 649–661.

Zijlema, Stelling and Smit (2011): SWASH: An operational public domain code for simulating wave fields and rapidly varied flows in coastal waters. Coastal Engineering, ELSEVIER, 58: 992-1012.

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Copyright (c) 2023 Tomohiro Suzuki, Panagiotis Vasarmidis, Corrado Altomare, Sieglien De Roo, Marcel Zijlema