长江口台风暴潮的计算模式研究

长江口台风暴潮的数值研究包括计算模式的研究、增水计算、潮波传播计算和预报模式研究等四部分.本文阐述用二维全流型风暴潮方程组计算长江口地区风暴潮的模式.将计算域分成口外区增水线性计算和口内区考虑增水与潮汐综合作用非线性计算.文章讨论了两个计算区域的确定,并详述了采用套网格差分格式时,时间、空间步长不同的计算域间的交接方法.

Numerical Model of Yangtze Estuary Storm Surge

The numerical study on storm surge of Yangtze estuary consists of four parts: the numerical model, the calculation of set-up, the calculation of tidal ware transmission, and the study on predicative model. The model presented here, depending on storm surge equation sets in terms of vertically integrated horizontal velocity components of total water column, is specifically designed for the calculation of storm surge of Yangtze estuary region. The domain calculatted is divided into two parts: the outer part, linear region and the inner part, nonlinear region considering the complex influence of set-up and tides. The determination of bound between regions is discussed, and especially, the linking method between regions with different spatial steps is described in detail .when the nest difference scheme is adopted.