An Empirical Model to Estimate Overwash

作者：Park Young Hyun; Edge Billy L^*

来源：Journal of Coastal Research, 2010, 26(6): 1157-1167.

DOI：10.2112/JCOASTRES-D-09-00017.1

• Laboratory experiment
• sediment transport
• laser measurement
• overwash empirical equation
• zero point method

Overwash induced by storms is one of the factors that threaten coastlines causing erosion and sediment transport especially in areas of low dune elevation Laboratory experiments provide mechanisms for eliminating many of the varied environmental conditions that typically exist in the field For instance it is difficult to observe conditions before and after the landfall of a storm however such observations are much simpler in a laboratory setting The experiments conducted in this study focused on the volume of eroded and transported sediment by overwash of the berm and dune at different slopes the wave heights and the periods of regular and irregular waves Experiments were conducted under both short term (327 s) and longer term conditions (30 60 and 180 min) The newly developed zero point method that calculates the offshore and onshore sediment transport was used for analysis and was verified with field measurements The empirical equations were developed using robust regression after selecting dominant factors in a sensitivity analysis The regression equations compared favorably with the laboratory and field data The empirical equation for irregular waves proved to be a simple and quick way to estimate the landward sediment transport rate by overwash

• 出版日期2010-11