In this paper a new expression is derived for practical applications in coastal areas, as well as for numerical modeling of sediment transport and shoreline change on the nearshore. This expression was derived starting with the Longuet-higgins (1970) equation, wich is valid for periodic waves, and using the sea state theory for wind generated waves. Its reliability was assessed by comparing six field and laboratory databases (LSTF- Smith et al., 2003; Duck, 1985; Sandyduck 1 and 2; Schoonees and Theron, 1996; Wang et al., 1998). The formula's main parameter is a new function which depends on the wave and seabed sediment characteristics. In general, based on the calculation results, the newly developed formula yelded overall good predictions. The pattern in the graph which compares measured and calculated transport rates for all datasets is similar, although a few points are located far away from the main group of points. In conclusion, the objectives in this report, which were to develop a new expression for the longshore sediment transport rate and to test the formula against data, were successfully achieved.
LONGSHORE SEDIMENT TRANSPORT: A NEW FORMULA FOR WIND GENERATED WAVES
BARBARO, Giuseppe;
2008-01-01
Abstract
In this paper a new expression is derived for practical applications in coastal areas, as well as for numerical modeling of sediment transport and shoreline change on the nearshore. This expression was derived starting with the Longuet-higgins (1970) equation, wich is valid for periodic waves, and using the sea state theory for wind generated waves. Its reliability was assessed by comparing six field and laboratory databases (LSTF- Smith et al., 2003; Duck, 1985; Sandyduck 1 and 2; Schoonees and Theron, 1996; Wang et al., 1998). The formula's main parameter is a new function which depends on the wave and seabed sediment characteristics. In general, based on the calculation results, the newly developed formula yelded overall good predictions. The pattern in the graph which compares measured and calculated transport rates for all datasets is similar, although a few points are located far away from the main group of points. In conclusion, the objectives in this report, which were to develop a new expression for the longshore sediment transport rate and to test the formula against data, were successfully achieved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
