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引起广西近岸增减水主要是台风导致的风暴潮所致。受台风影响,北海站42年中最大增水1.45m,最大减水-1.87m。受台风走向影响,广西近海总是先减水后增水。引起广西近海增减水除去台风直接作用外,还有广东沿海陆架波西传的间接作用。西传的陆架波一部分直接穿过琼州海峡进入北部湾,另一部分绕过海南岛以顺时针方式进入北部湾。2001年7月6日,台风“尤特”已在珠江口北岸登陆,可是7月8日却在广西近海普遍引起20cm以上增水。7月2日18时,台风“榴莲”已经在广西登陆,但是西传的陆架波使广西沿岸发生很强的西向流,表层地转流流速接近92cm/s。广西沿岸增减水除去台风直接与间接作用外,还有地形的影响与大气重力波的强化作用。
Caused by the coast of Guangxi is mainly caused by typhoon storm surges. Affected by the typhoon, Beihai Station in the biggest increase in 42 years 1.45m, the maximum water reduction -1.87m. Affected by the typhoon, Guangxi offshore is always the first water after water. Caused by the addition and subtraction of Guangxi offshore waters to remove the direct role of typhoons, but also the indirect role of the Guangdong coastal shelf wave West. Some of the Western Shelf waves directly pass through the Qiongzhou Strait and enter the Beibu Gulf. The other part bypasses the island of Hainan to enter the Beibu Gulf in a clockwise manner. July 6, 2001, typhoon “Ute ” has landed in the north bank of the Pearl River estuary, but July 8 in Guangxi offshore generally caused more than 20cm of water. At 18:00 on July 2, the typhoon “Durian” has landed in Guangxi, but the western shelf waves caused a strong westward flow over the coast of Guangxi. The surface flow velocity was close to 92cm / s. In addition to the direct and indirect effects of typhoons on the coasts of Guangxi, there is also the effect of topography on the enhancement of atmospheric gravity waves.