辐射沙脊群蒋家沙西段地貌演变特征

Geomorphic evolution characteristics of western segment of Jiangjiasha in radial sand ridge group area

基于卫星遥感技术,采用地貌特征线遥感解析法,分析蒋家沙沙脊、黄沙洋水道和苦水洋水道1973—2014年地貌演变特征。结果表明,蒋家沙沙脊、黄沙洋水道和苦水洋水道是个有机整体,近岸段由西向东摆动,离岸段由北向南摆动,尤其是苦水洋水道往离岸方向(即向东)退缩极为显著。该特征可能与南北两大潮波系统交汇而成的移动驻潮波南移有关,该特征也揭示了该区域海床的时空冲淤规律。

Based on satellite remote sensing technology,this study used the analytical method of geomorphic feature lines to analyze the geomorphic evolution characteristics of the Jiangjiasha sand ridge,Huangshayang channel,and Kushuiyang channel during the period from 1973 to 2014. The results show that the Jiangjiasha sand ridge,Huangshayang channel,and Kushuiyang channel form an organic whole; the nearshore segment moves from west to east; and the offshore segment moves from north to south. The Kushuiyang channel has retreated significantly in the offshore direction（ eastward）. This may be related to the southward movement of the moving tidal wave formed by the intersection of the southern and northern tidal wave systems,and reveals the erosion and deposition patters of the seabed in this area.