Overwash induced by storm conditions

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Title: Overwash induced by storm conditions
Author: Park, Young Hyun
Abstract: Erosion problems are not only in the Texas area , but exist also along the coastline all over the world . Even though many researchers have studied coastal processes related with beach erosion and deposition over the decades , these processes are too complex to understand completely and field measurements are difficult to obtain during landfall of storms which cause fatal damages . Overwash is strongly suspected to cause extreme erosion as seen from long -term field measurements in the upper Texas coast . Overwash and washover are the source of cross -shore erosion and deposition of beach material along the coast , respectively . Waves superimposed on increased storm surges overtop and generate serious erosion of the berm . However , the data for these processes do not completely describe the shoreline erosion problems . Providing better descriptions requires field measurements and laboratory experiments with careful calibration . This study was conducted in two major sections . First was a field measurement and second was a laboratory experiment . This study used the RTK -DGPS to measure the change in the beach profile over multi year period . The GPS system is one of the ways to have the best resolution . The laboratory experiment was done in a 2D wave tank on mid -scale based on similitude law at Texas A &M University . The experiment was necessary to obtain better empirical formulas . The erosion rate of the sand was measured at different wave conditions and slopes of the berm or upper beach face in regular and irregular waves respectively . The erosion rate is much bigger at higher wave height , longer wave period and steeper beach face . The erosion rate is increased proportional to speed of bore and it is decreased with time . The empirical formulas were the first approach to simulate the impact of overwash . The laboratory results represented good agreement with the field data and might be applicable to predict the shoreline recession by overwash induced by storms . Further improvements can be expected by adding these empirical formulas to a numerical model to predict sediment transport in the swash zone .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1171
Date: 2009-05-15

Citation

Overwash induced by storm conditions. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1171 .

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