舟山外钓山海岸边坡泥沙动力与冲淤演变特征  

Sediment Dynamics and Evolution on the Coastal Slope of the Waidiaoshan Island, Zhoushan, Zhejiang, China

作　　者：刘毅飞[1] 夏小明[1] 贾建军[1] 

机构地区：[1]国家海洋局第二海洋研究所海底科学重点实验室,浙江杭州310012

出　　处：《海洋通报》2007年第6期53-60,共8页Marine Science Bulletin

基　　金：国家自然科学基金(40231010;40276031);重大基础研究前期研究专项(2002CCA04800);国家908专项评价项目(908-02-03-08)

摘　　要：通过对研究区海域的水文泥沙进行现场测验,对比1960-1962年海图、1995年和2001年水下地形图三期地形数据和分析浅地层探测数据等方法,分析了舟山外钓山岛西海岸边坡的水动力、悬浮泥沙及冲淤特征,探讨了海岸边坡发育演变的模式与机制。研究结果表明,在基岩岬角海岸与潮流深槽的边界控制及往复潮流的作用下,舟山外钓山岛西海岸边坡演变是一个"上淤下冲"的模式,即边坡变陡至边坡土体失稳并在不定期外力触发下滑塌堆积坡脚,然后上部重新淤积、下部滑坡体不断被侵蚀的循环过程。According to the observed data of hydrodynamics, suspended sediments, sub-bottom profiles and topographic maps, we analysed the sediment dynamics, erosion and accretion process on the west coast of the Waidiaoshan Island in Zhoushan and studied the evolutionary model and mechanism of the coastal slope. The results show that the upper slope is accumulated and the lower slope is eroded under the control of the rocky coast, deep tidal trench and rectilinear tidal current. To some extent, the slope becomes unstable, and the sub-bottom layer may slide down and pile at the foot of the slope due to the gravity. The above process is the cyclic one.

关 键 词：外钓山海岸 泥沙动力 冲淤演变 

分 类 号：P731.2[天文地球—海洋科学]