Kideok Do, Nobuhisa Kobayashi, Kyung-Duck Suh


The performance of a large nourishment project on Bethany Beach, Delaware is evaluated using available beach profile, wave and tide data during September 2007 to September 2010. The volume of the placed sand with the median diameter of 0.31 mm was about 500 m3/m along the curved shoreline of 1.8 km length. The nourished beach was attacked by two severe storms in May 2008 and November 2009. The eroded sand volume above the mean sea level (MSL) was about 70 m3/m for each of the two storms and emergency repairs were necessary. The numerical cross-shore model with multiple cross-shore lines is used to compute the cross-shore and longshore sediment transport. The beach erosion above MSL is shown to be caused by the offshore sand transport and the alongshore gradient of the longshore sand transport rate. The performance of the nourished beach is predicted to be sensitive to the sand diameter in the range of 0.23 to 0.45 mm.


Beach; Sand; Nourishment; Storm; Erosion; Waves; Currents


Dean, R.G. (1991). Equilibrium beach profiles: Characteristics and applications, J. Coastal Res., 7(1), 53-84.

Do, K., Kobayashi, N., and Suh, K.D. (2012). Performance of Bethany Beach nourishment project against two severe storms in 2008 and 2009, Res. Rep. No. CACR-12-01, Center for Applied Coastal Research, Univ. of Delaware, Newark, Del.

Farhadzadeh, A., Kobayashi, N., and Gravens, M.B. (2012). Longshore sediment transport due to breaking waves and external current, J. Waterway, Port, Coastal, Ocean Eng., (in press).

Figlus, J. and Kobayashi, N. (2008). Inverse estimation of sand transport rates on nourished Delaware beaches, J. Waterway, Port, Coastal, Ocean Eng., 134(4), 218-225.

Jiménez, J. and Madsen, O.S. (2003). A simple formula to estimate settling velocity of natural sediments, J. Waterway, Port, Coastal, Ocean Eng., 129(2), 70-78.

Kobayashi, N. and Jung, H. (2012). Beach erosion and recovery, J. Waterway, Port, Coastal, Ocean Eng., (accepted).

Kobayashi, N., Farhadzadeh, A., and Melby, J.A. (2010). Wave overtopping and damage progression of stone armor layer, J. Waterway, Port, Coastal, Ocean Eng., 136(5), 257-265.

Kobayashi, N., Hicks, B.S., and Figlus, J. (2011). Evolution of gravel beach profiles, J. Waterway, Port, Coastal, Ocean Eng., 137(5), 258-262.

Kobayashi, N., Buck, M., Payo, A., and Johnson, B.D. (2009). Berm and dune erosion during a storm, J. Waterway, Port, Coastal, Ocean Eng., 135(1), 1-10.

Puleo, J.A. (2010). Estimating alongshore sediment transport and the nodal point location on the Delaware-Maryland coast, J. Waterway, Port, Coastal, Ocean Eng., 136(3), 135-144.

Ramsey, K.W. (1999). Beach sand textures from the Atlantic coast of Delaware, Open File Rep. No. 41, Delaware Geological Survey, Newark, Del.

U. S. Army Engineer Research and Development Center. (2002). Coastal Engineering Manual, Part III, Coastal Sediment Processes, Coastal and Hydraulics Lab., Vicksburg, Miss.

Yamada, F. and Kobayashi, N. (2007). Intertidal multiple sand bars in a low-energy environment, J. Waterway, Port, Coastal, Ocean Eng., 133(5), 343-351.

Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.