8007号强台风暴潮物理机制数值分析

NUMERICAL ANALYSIS OF THE PHYSICAL MECHANISMS OF THE STORM SURGE OF TYPHOON No. 8007

一、前言8007号(Joe,1980)强台风暴潮是我国近百年来最严重的一次,广东省雷州半岛的南渡站测得它的最大增水值是5.94米,成为我国有逐时潮位资料记录以来风暴潮的最高记录,居世界第三位。它的成因及物理机制问题,引起了我国风暴潮界的普遍关注。为分析、研究其结构和成因,作者从风暴潮二维全流方程组出发,选用有限差分数值解的途径,对8007号强台风暴潮进行了分析计算。结果表明,与实际情况较为吻合,从而清晰地再现了这场特大的台风暴潮,且在一定程度上揭示了该场暴潮的物理机制。

Typhoon No.8007 struck at the western coast of Guangdong province onJuly,22,1980 induced one of the greatest storm surges in about one hundredyears in China bearing the characters of high value and rate of surge,broader area under effect and short duration.The genesis and physical mechanisms ofwhich have amused great attentions and interests.This paper uses definite difference numerical methods of two demensionalwhole current equations in solving of storm surge to make a series of analysesand modelling of this storm surge.The results from which,agreed with thefield conditions,have not only reproduced qualititatively and quantitatively thepractical features of the storm surge,but also revealed its physical mechanis-ms.The storm surge was induced normally by typhoon No.8007 in the favo-urable physical environments along the coast but not by resonance,the majordriving force being the wind stress of the typhoon.