WAVE OVERTOPPING AND SEDIMENT TRANSPORT OVER DUNES

Proceedings of the International Conference on Coastal Engineering

Mark W. Hancock²  Nobuhisa Kobayashi¹ 

[1] Center for Applied Coastal Research, Department of Civil Engineering, University of Delaware;Frederic R. Harris, Inc.

关键词: overtopping;    sediment transport;    dune;   

DOI  :  10.9753/icce.v24.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Experiments were conducted on a sand beach to represent occurrences of minor to major dune overtopping by varying the spectral peak period of incident irregular waves. Both water overtopping and sand overwash rates were measured. The experimental results were compared to existing empirical formulas for equilibrium beach slopes (Kriebel, Kraus, and Larson, 1991), cross-shore sediment transport (Kraus and Mason, 1993), and irregular wave reflection (Seelig, 1983) from sand beaches. Scale and non-equilibrium effects were found to be important causes of discrepancies between predicted and measured values. Additionally, an empirical formula for the overtopping of coastal structures (De Waal and Van der Meer, 1992) was compared with overtopping measurements for the experimental dune. The empirical formula of De Waal and Van der Meer gave order-of-magnitude estimates, but could not account for the effects of the profile evolution within each test. The measured average volumetric sediment concentration was found to be independent of the normalized overtopping rate and varied by only a factor of two.

【 授权许可】

Unknown