摘要
本文叙述一种用于风暴潮数值预报模式的经济的显式积分方案。应用分离技术将风暴潮模式控制方程组分成三个阶段。调整阶段包括水位梯度和科氏力项,采用向前-向后方案积分。包括水平平流项的平流阶段采用长的时间步长。风应力、底应力和大气压力梯度项和其它项分开,并且用和平流阶段同样长的时间步长积分,显式分离方案已应用于风暴潮模式。预报域包括黄海、东海和南海,对一些引起风暴潮的台风个例进行后报试验。结果是采用显式分离方法比非分离方法计算经济,而且对有些个例,计算精度比以前所用方法也略有提高。
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.
作者
杨世莹
吴辉碇
Yang Shiying;Wu Huiding(National Research Center for Marine Environment Forecasts,SOA,Beijing)
出处
《海洋与湖沼》
1988年第6期562-573,共12页
Oceanologia Et Limnologia Sinica
