外钓山岛附近海域冲淤演变分析

Analysis on Scouring-Silting Variation of the Sea Area Nearby Waidiaoshan Island

基于外钓山岛附近海域2004年、2007年和2011年3个年份的水深数据,结合Google Earth的影像资料,应用地理信息系统,详细研究了2004-2015年间外钓山岛的岸线演变和2004-2011年间外钓山岛整体开发前附近海域的冲淤变化。结果显示,外钓山岛的岸线总体保持稳定,只是在局部岸段由于围海造地和新建码头改变了原有的岸线形态;附近海域经历了由缓慢冲刷到较快淤积的调整过程,但总体上以淤积为主,平均淤积0.61 m,淤积速率为7.6 cm/a。同时,利用水文泥沙实测资料和开发利用现状,探讨了外钓山岛附近海域的冲淤原因和动态趋势,说明人类活动是导致该海域淤泥的主要原因。

Based on the bathymetric data of the sea area nearby Waidiaoshan Island in 2004, 2007, 2011, and the image data on Google Earth, geographic information system is applied to study the coastline evolution of Waidiaoshan Island from 2004 to 2015 and the scouring-silting variation of the sea area nearby Waidiaoshan Island before its large scale development, from 2004 to 2015. The results indicate the coastline maintains sta- bility on the whole, except for reclamation and wharf construction in some local parts changing its original form. The sea area nearby Waidiaoshan Island has experienced the process of slowly scouring to quickly silt- ing. But in generally, it is characterized by deposition, with average siltation thickness 0.61 m and its rate 7.6 cm/a. Meanwhile, the scouring-silting variation reason and trend is discussed according to the hydrological and sediment data as well as the exploitation situation, illustrating the primary cause to deposition is human impact.