Author(s): Yang Shiymg and Wu Huiding
Pages: 562-573
Year: 1988 Issue:  6
Journal: Oceanologia et Limnologia Sinica
Keyword:  风暴潮数值预报; 风暴潮模式; 时间步长; 分离解; 控制方程组; 科氏力; 分离方法; 大气压力; 平流; 水位梯度;
Abstract: An economical explicit integration scheme for a numerical storm surge prediction model is described in this paper. A splitting technique is used, with which the governing equations for the storm surge model are divided into three stages. The adjustment stage includes the elevation gradient and Coriolis terms which is integrated by using a forward-backward method. In the advection stage, the horizontal advection terms are calculated with a longer timestep. The wind stress, bottom stress and the atmospheric pressure gradient terms are split from the other terms and integrated in a separate stage with the same timestep as used in the advection stage. The forecasting region covers the Huanghai Sea, the East China Sea and the South China Sea. The hindcasts have been carried out for some cases of typhoons which caused storm surges. The use of split explicit scheme leads to a substantial computational economy compared with previously available schemes. It is shown that the computed results improve accuracy for some cases.