摘要
本文分析了多年的台风和波浪资料得到如下的结果:对崇明东滩有较大影响的台风路径主要有两类:即在浙江中部至长江口登陆的台风和在长江口外侧海域转向北上的台风;佘山岛海洋站百年一遇的最大波高为5.6m;台风期间偏北、东北、东南的强风向均能引起长江口较大的增水现象。 本文还以8310号台风为例,阐明了台风前后的冲淤变化及台风浪塑造的滩地地貌形态。指出东旺沙和北八效高潮滩冲淤甚微,中低潮滩冲刷严重,奚东沙高潮滩冲刷严重,中低潮滩呈微淤状态。波浪对东滩塑造的主要地貌形态有冲刷坑和浪蚀泥坎。
Typhoon wave affecting the eastern Chongming flat is landing on between the middle part of Zhejiang coast and the Changjiang Estuary. and going north along the coast of the Changjiang River. The typhoon can induce water rising. The No. 8310 typhoon had made water rise of 1. 33 m at Hengsha. Based on the long- term observations at Sheshan Island oceanographic station, the maximum wave height probability of one time over 100 years is 5.6 m. During the No. 8310 typhoon, all the observable piles had been scoured off in the lower and middle flats of Dongwangsha. indicating that the strength of the erosion is serious. The erosion rang is 2-14 cm in Beibaxiao. Owing to surf of nearshore water, scouring occurs at the high tidal flat, erosion depth can reach 21 cm. and the middle, lower flats have some erosion and accumulation in Xidongsha. The sediment profiles show that the typhoon wave can made the materials growing coarser, decrease in porosity and increase in cohesion.
出处
《东海海洋》
1993年第4期8-16,共9页
Donghai Marine Science
关键词
台风
风浪
冲淤作用
崇明东滩
typhoon wave eastern Chongming flat storm deposits
