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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。
According to the characteristics of the natural environment in the sea area, the coastal areas in the east of Zhejiang can be divided into the following four sea areas: the modern Yangtze River delta front slope area, the estuary harbor area, the island group area and the underwater bank area. The island group is divided into three sub-regions according to the development of the tidal channel: 1 North Zhoushan Islands, 2 South Zhoushan Islands and 3 South Island Islands. The results show that the instability of soil is mainly distributed in the tidal channel of Zone 2, and the most common is the channel deep groove slope, the channel concave channel, the confluence of channels and the residual highland edge in the channel. Through the analysis of the distribution law of underwater landslide and the scouring and silting characteristics of the tidal channel, it is concluded that the increase of slope caused by the erosion and deposition of the tidal channel is the main inducing factor of landslide.