Longshore Variation of Depth of Closure around Coastal Structure

Abstract

The depth of closure determination on Sendai Port and Yuriage Port is predicted using bathymetry data from 1988 to 1998 and 1994 to 1997, respectively. Several cross sections are taken in order to produce longshore variation. Its relation with standard deviation value is also depicted in several cross sections. Wave data collected during 1991 to 2003 is utilized. Boussinesq equation modified by Peregrine (1967) is applied considering its application in non-linear phenomenon. Regular incoming wave is assumed in numerical computation to obtain u_bmax. Furthermore, Shields parameter (τ₀^*) as incipient motion criterion is calculated. The result is confirmed using longshore variation of h_c obtained from bathymetry analysis.