东海沿岸假潮基本特征

The Fundamental Characteristics of Seiches Along the East China Sea Coast

根据东海沿岸海洋站的实测潮位资料，对东海沿岸假潮的基本特征进行了初步分析和统计，结果表明，东海区港湾假潮特征明显，浙江沿海假潮比福建沿海多。全年多数出现在３、４月和８、９月间，坎门、嵊山、长涂和三沙的最大振幅分别为１７０、９５、８５和１００ｃｍ，大陈和平潭为４１和３９ｃｍ，长涂的平均周期主要在２０～３０ｍｉｎ，其余各站普遍在２０ｍｉｎ以内，当有热带气旋影响时，持续时间较长，最长可达１００ｈ以上；除长涂假潮主要出现在涨、落潮过程中外，其它站假潮多发生在高、低潮时。

Based on the dare of tide height recorded by the Ocean Station along the East China Sea coast, we have primarily analyzed and recorded the fundamental characteristics of seiches along the coast of the East China Sea. The result shows that the characteristics of seiches are obvious and that the seiches occur more frequently along the coast of Zhejiang Province than those along the coast of Fujian Province. They occur mostly during March and April, August and September. The maximum amplitude in Kanmem, Shengshan, Changtu and Shansha is 170, 95, 85, 100 cm respectively. The amplitude in Dachen and Pingtan is 41 and 39 cm. The average period in Changtu ranges mainly between 20-30min, while that in other stations is generally less than 20 min. When affected by tropical cyclone, the seiches will last for a long time up to 100 h or more. Except in Changtu Where the seiches occur during the flood and ebbtides,and those in other statoins mostly at high tide and low tide.