Nguyen Xuan Tinh, Magnus Larson, Chantal Donnelly, Hitoshi Tanaka


Every year there are many severe storms occurring around the world, in general, and in Japan, in particular. The occurrence of storms is expected to increase because of the global warming effects. An increasing wave height together with a rising mean water level during a storm create a high possibility for waves to overtop the beach crest causing a lot of sediment to be eroded to offshore areas or deposited in the inland direction. The study of the barrier island response to storms has therefore become very important in terms of sediment transport and beach morphology change, as well as damage to nearshore structures due to runup overwash and inundation overwash. However, changes in the beach profile and prevailing sediment transport mechanisms during a real event are difficult to obtain. Thus, laboratory studies are necessary to conduct. This study presents a laboratory experiment on the impact of storms on a sandy barrier islands. The main aim is to investigate the entire barrier island (or sand spit) response due to storm conditions considering the increase in water level due to storm surge. Also, further development of an analytical model for barrier profile change caused by runup overwash is presented and obtained results overall captured order-of-magnitude barrier face retreat and volume changes after the storm.


Storm; Barrier evolution; experiment; overwash; washover, analytical model

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Baldock, T.E., Hughes, M.G., Day, K. and Louys, J., 2005. Swash Overtopping and Sediment Overwash on a Truncated Beach. Coastal Engineering 52, 2005, 633-645

Bymes, M.R., and Gingrerich, K.J., 1987. Cross-inland profile response to Hurricane Gloria, Proceedings Coastal Sediments '87, ASCE, 1486-1502.

Coastal Engineering Manual (CEM) 2002: Chapter III-3, "Cross-shore Sediment Transport Processes"

Donnelly, C. 2008: Coastal overwash: Processes and modeling, PhD Thesis, Department of Water Resources Engineering, Lund University, Sweden, 52pp.

Hancock M.W., 1994: "Experiments on irregular wave overtopping and overwash of dune", Master thesis in Civil Engineering, Faculty of the University of Delaware, Netwark, DE

Kobayashi, N., Tega, Y., and Handcock, M.W. (1996). "Wave reflection and overwash of dunes," Journal of Waterway, Port, Coastal, and Ocean Engineering, ASCE, Vol. 122, No. 3, 150-153.

Larson, M., Wise, R.A., and Kraus, N.C., 2005: "Modeling dune response due to overwash transport," Proceedings 29th Coastal Engineering Conference, World Scientific Press, 2133-2145

Larson, M.L., Donnelly, C., Jimenez, J., Hanson, H. (2009): Analytical model of beach erosion and overwash during storms, Proceedings of ICE Maritime Engineering. Vol. 162, pp115-126

Parachure, T., Dean, R.G., and Srinivas, R., 1991. Laboratory study of overwash on barrier islands. Progress Report, Coastal and Oceanographic Department, University of Florida.

Tuan, T.Q. 2007: Seasonal breaching of coastal barriers. PhD Thesis, Department of Coastal Engineering, Delft University, The Netherlands, 177pp.

Van der Wal, K., and K. Pye. 2003. "The Use of Historical Bathymetric Charts in a GIS to Assess Morphological Changes in Estuaries." Hydrographic Journal, 110. October.

Williams, P.L., 1978: Laboratory development of a predictive relationship for washover volume on barrier island coastlines, Master thesis, Department of Civil Engineering, University of Delarware, Netwark, DE, 154p.