EROSION PROGRESSION OF WOODED COASTAL DUNE

Berna Ayat Aydogan, Nobuhisa Kobayashi

Abstract


Active plantation of woody plants over coastal sand dunes has been known to reduce the wave overtopping and overwash. In this study interactions among waves, sand dune and woody plants were investigated experimentally. Wooden plants were represented by cylindrical wooden dowels. Two tests were conducted to examine the placement density of the dowels. Additional two tests were conducted to examine the toppling effect of the dowels covering the dune. The measured data indicate that toppling of the dowels on the foreslope of the dune diminishes the effectiveness of the dowels in reducing dune erosion and overwash because the dowels on the foreslope reduced wave uprush and overtopping. The data collected in these experimental study were used to calibrate and verify the numerical model CSHORE.

Keywords


vegetation; dune; erosion; toppling

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References


Ayat, B., and Kobayashi, N. 2014. Vertical cylinder density and toppling effects on dune erosion and overwash, J. Waterway, Port, Coastal, Ocean Eng., 10.1061/(ASCE)WW.1943-5460.0000264 , 04014026.

Ayat, B., and Kobayashi, N. 2013. Numerical modeling of erosion and overwash of vegetated dunes, Proceedings of 6th SCACR – International Short Course/Conference on Applied Coastal Research, Lisbon, Portugal.

Kobayashi, N., Gralher, C., and Do, K. 2013. Effects of woody plants on dune erosion and overwash, J. Waterway, Port, Coastal, Ocean Eng, 6, 466-472.

Gralher, C., Kobayashi, N., and Do, K. 2012. Wave overwash of vegetated dunes. Proceedings of 33rd International Conference on Coastal Engineering, ASCE, 1-7.

Kobayashi, N., Farhadzadeh, A., Melby, J.A., Johnson, B.D., and Gravens, M. (2010). Wave overtopping of levees and overwash of dunes. J. Coastal Research, 26(5), 888-900.




DOI: https://doi.org/10.9753/icce.v34.sediment.16