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原文传递 Effect of Asymmetric Directional Spreading on the Total Radiation Stress

题名：	Effect of Asymmetric Directional Spreading on the Total Radiation Stress
其他题名：	Barbaro,G.,Foti,G.,Sicilia,L.,and Malara,G.(2014)."A formula for the calculation of the longshore sediment transport including spectral effects."J.Coast.Res.,30(5),961-966.
正文语种：	英文
作者：	Annika O'Dea
关键词：	Radiation stress;Directional asymmetry;Refraction;Random waves
摘要：	The process of wave refraction in nearshore zones can result in an asymmetric directional distribution of spectral energy when oblique, multi-directional wave fields propagate into shallow water areas. Here the effect of this directional asymmetry on the net wave-induced radiation stresses is analyzed. The net radiation stresses are calculated for a shoaled JONSWAP frequency spectrum with both symmetric and asymmetric directional distributions and then compared with those calculated from the commonly-used monochromatic formulation (appropriate for spectra that are narrow-banded in frequency and directions). Past studies have demonstrated that the use of the monochromatic approximation in radiation stress calculations results in a significant overestimation of the radiation stress components Sxx and Sxy in broad-banded seas. The present results show that the inclusion of directional asymmetry in radiation stress calculations reduces this overestimation for Sxx but increases the overestimation for Sxy for a range of dominant wave directions. Thus, directional asymmetry is an additional factor that contributes to overestimation when the monochromatic approximation is used for Sxy and can therefore also lead to an overestimation of associated parameters such as alongshore current velocities and alongshore sediment transport rates.
出版年：	2015
论文唯一标识：	P-108Y2015V141N06008
英文栏目名称：	Technical Notes
doi：	10.1061/(ASCE)WW.1943-5460.0000305
期刊名称：	Journal of Waterway, Port, Coastal, and Ocean Engineering
拼音刊名(出版物代码)：	P-108
卷：	141
期：	06
页码：	62-67