Hai Trung Le, Jentsje van der Meer, Gerrit Jan Schiereck, Vu Minh Cat, Gerben van der Meer


Sea dikes in Viet Nam have been built up during a long history. Every year, about 4 to 6 storms attack the coast and cause severe damages of the sea dikes. Till now, little is known about strength and stability of the inner slope covered with grass under impacts of wave overtopping during storm surges. Destructive tests have been performed with the Wave Overtopping Simulator in Viet Nam revealing that grass slopes are able to withstand a certain amount of wave overtopping. In Hai Phong, a slope section covered by Vetiver grass could suffer a maximum wave overtopping discharge of up to 120 l/s per m. In Nam Dinh, three tested locations within a short dike section of 50 m show a large variation in erosion resistance of the Bermuda grass slope with maximum discharge of 20, 40 and 70 l/s per m.


discharge; erosion; grass; wave overtopping simulator; soil; wave overtopping

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Bosman, G., 2007. Velocity and flow depth variation during wave overtopping. MSc thesis, Delft University of Technology, Delft, The Netherlands.

EurOtop Manual, 2007. Wave Overtopping of Sea Defences and Related Structures - Assessment Manual. UK: N.W.H. Allsop, T. Pullen, T. Bruce. NL: J.W. van der Meer. DE: H. Schüttrumpf, A. Kortenhaus. www.overtopping-manual.com.

Le Hai Trung, Nguyen Ba Tuyen, Vu Minh Cat and Gerrit Jan Schiereck, 2008. Wave overtopping on Vietnamese sea-dikes. Seventh International Conference on Coastal and Port Engineering in Developing Countries (COPEDEC VII). Dubai, UAE, 2008.

Mai Van Cong, 2010. Probabilistic Design of Coastal Flood Defences in Viet Nam. PhD thesis, Delft University of Technology, Delft, The Netherlands.

Schüttrumpf, H. and van Gent, M. R. A, 2003. Wave overtopping flow at seadikes. ASCE, Proc.

Coastal Structures 2003, Portland, USA, pp. 431 – 443.

Van der Meer, J.W., Snijders, W., and Regeling, E., 2006. The wave overtopping simulator. ASCE, proc. ICCE 2006, San Diego, 4654-4666.

Van der Meer, J.W., 2007. Design, construction, calibration and use of the wave overtopping simulator. Comcoast, Workpackage 3: Development of Alternative Overtopping – Resistant Sea Defences, Phase 3.

Van der Meer, J.W., G.J. Steendam, G. de Raat and P. Bernardini. Further developments on the wave overtopping simulator. ASCE, Proc. ICCE 2008, Hamburg. pp. 2957-2969.

Van der Meer, J.W., Schrijver, R., Hardeman, B., Van Hoven, A., Verheij, H., Steendam, G.J., 2009. Guidance on erosion resistance of inner slopes of dikes from three years of testing with the Wave Overtopping Simulator. Proc. ICE, Breakwaters, Marine Structures and Coastlines; Edinburgh, UK.

Wave Overtopping Simulator tests in Viet Nam - Two years of testing, Hai Phong and Nam Dinh province. Technical report, 2010. Project "Technical Assistance for Sea Dike Research". Water Resources University, Ha Noi, Viet Nam.

DOI: https://doi.org/10.9753/icce.v32.structures.2