基于遥感测量的海岸线变化与分析

Analysis of coastline change based on remote sensing measurement

采用较高分辨率的卫星影像,对影像的空间数据进行挖掘,解译出不同时期的海岸线;在盐城沿海选择12个断面,定量地获取海岸线信息,计算海岸的淤蚀形态和速率变化;分析典型岸段人类活动对海岸线变化的影响.分析结果表明：在人类活动影响下研究区域海岸线形态平直化程度加剧,2007—2009年海岸线平直情况突出,长度缩短近40km;2009—2010年海岸线平直化有所减缓.盐城海岸线年平均淤长速率在44~100m.射阳河口北部海岸线变化很小,南部淤长比较明显（其中水龙港—川东港口海岸年淤长速率达到278m）.

High-resolution satellite images were used to mine spatial data of images and interpret the coastlines in different periods.Twelve cross-sections in the coastal area of Yancheng City were selected to obtain the coastline information quantitatively and calculate the pattern and speed variation of progradation and erosion of the coastline.The impacts of human activities on changes in the coastline in typical coastal sections were analyzed.The results show that the coastline was intensely straightened due to human activities in the study area.During the period from 2007 to 2009,nearly 40 km of the coastline length was cut down.The straightening process of the coastline slowed down during the period from 2009 to 2010.The annual average progradation rate of the coastline of Yancheng City ranged from 44 m to 100 m.There was a little change in the coastline north of the Sheyang Estuary.The progradation variation was significant in the south,where the annual progradation rate of the coastline from Shuilong Port to Chuandong Port reached 278 m.