近海海洋对热带风暴线性响应的底坡度和底摩擦效应

一个简单的二维线性模式用于考查近海海洋对过境热带风暴的动力响应过程中的底坡度和底摩擦效应。选择了自东向西和向西后转向的两个模式风暴路径。数值试验结果表明，海底坡度与风暴引起的水位波动、风暴中心后部的尾流以及路径右侧后方面的涡旋密切相关。而底摩察是阻尼风暴潮和风暴流持续增长的重要因子。结果还表明，近海对风暴的强响应偏向于风暴轨迹的右侧，这与Ｃｈａｎｇ和Ａｎｔｈｅｓ（１９７８）对深海响应的研究结论是一

BOTTOM SLOPE AND FRICTION EFFECTS ON THE LINEAR RESPONSE OF COASTAL OCEAN TO TROPICAL STORMS

A simple linear two-dimensional model is used for testing the bottom friction and slope effects on the dynamic response of a coastal ocean to the passing tropical storms. Two model tracks, westward and recurved, which are the same as specified in a previous study (Wang and Wang, 1993), are selected.Our numerical experiments indicate that the bottom slope is closely related with the amplitude of the storm-driven wave of water level, the wake current behind the storm center and the vortex on the right hand side of the storm track. The bottom friction is an important factor for restraining the continuosu growth of the surge and the storm driven currents.It is similar to the conclusion mentioned in the deep sea response study by Chang and Authes (1978) that the coasta1 oceanic response is biased toward the right of the storm track.By comparison between the linear and non-linear models it is found that nonlinear effect is not dominant in the response process.