【摘要】 依据海域的自然环境特征 ,浙江东部近海可划分为以下 4个海区 : 现代长江水下三角洲前缘斜坡区 , 河口港湾区 , 岛群区 , 水下岸坡区。其中岛群区依据潮汐通道的发育程度又划分为 3个亚区 : 1 舟山群岛北区、 2 舟山群岛南区、 3南部岛群区。研究结果表明土体失稳主要分布于 、 2 区的潮汐通道中 ,且以通道深槽边坡、通道凹岸、通道交汇处以及通道中的残留高地边缘等部位最为常见。通过对水下滑坡的分布规律及潮汐通道的冲淤特征的分析 ,得出了潮汐通道的冲淤变化而引起的坡度增大是滑坡产生的主要诱发因素等结论。更多还原

【Abstract】 According to natural environment condition features,the inshore east of Zhejiang Province can be divided into four regions as follows:Ⅰ delta front region of the modern Yangtze River subaqueous delta,Ⅱ estuary and harbor region,Ⅲ islands region,and Ⅳ underwater slope region.The islands region can be subdivided into three sub regions again according to the development degree of tidal channels:Ⅲ 1 northern region of the Zhoushan Islands,Ⅲ 2 southern region of the Zhoushan Islands,and Ⅲ 3 region south of Zhoushan Islands.Research results suggest that many instabilities exist in tidal channels of Ⅱ and Ⅲ 2 regions,what is more,the deep troughs of the channel,concave bank,conjoining of channels and margins of relict salients in channels are the positions where the instabilities concentrate.Based on the study of the distribution of landslides and the alteration of erosion and deposition in the tidal channels,a conclusion can be drawn that the increasing of gradient caused by the alteration of erosion and deposition is the main triggering factor to cause failures.更多还原