【摘要】 利用1997—2001年在东海海域获得的多波束全覆盖测深数据和收集的部分高分辨率单道地震剖面,对东海陆坡海底峡谷的地形要素,如长度、弯曲度、平均坡度、剖面特征、头部和末端的水深等进行了详细的分析和统计。根据平面形态将海底峡谷划分为3种类型:直线型、蛇曲型和树枝型。海底峡谷主要分布于中段和南段的东海陆坡之上,平面形态特征总体上自北向南趋于复杂(直线型→蛇曲型→树枝型),规模逐渐增大,不同平面类型代表了峡谷不同的演化阶段。峡谷的分布格局和变化趋势主要受控于冲绳海槽扩张背景下的构造活动。更多还原

【Abstract】 Topographical features such as the length,the bending level,the mean slope,the profile character and the water depth at the head and the tail of the submarine canyons on the East China Sea Slope were studied based on the multibeam bathymetric data acquired in the East China Sea from 1997 to 2001 and the collection of single-channel seismic profiles with high resolution.In morphology,three types of submarine canyons were recognized,which are linear,meandering and dendritic.They are mainly distributed on the middle and the southern segments of the slope.Their morphology tends generally to become complicated(linear→meadering→dendritic) and their scale increases graduallyfrom north to south.Different types of canyons represent different evolutionary stages.The distribution pattern and the changing tendency of the canyons are mainly controlled by the tectonic activities related to the spreading of the Okinawa Trough.更多还原