1974年以来长江口北支沙洲演变过程遥感监测

Remote sensing monitoring of sandbars evolution in north branch of Yangtze River estuary since 1974

1974年以来，长江口北支沙洲处于快速演变中。应用1974~2013年逐年的卫星遥感影像，对长江口北支主要沙洲的演变过程进行了分析。结果表明：长江口北支沙洲在40 a 间处于不断地发育和消失过程中，以永隆沙和兴隆沙逐步并入崇明岛、新村沙发育形成并不断壮大为典型。此外，周围还有一些沙洲处于不断地形成、壮大和消失过程中。研究成果可为长江口北支沙洲的开发利用、生态保护等提供数据支撑。

The sandbars in north branch of Yangtze River estuary evolve rapidly since 1974. The evolution of nain sandbars in North Branch of Yangtze River estuary is analyzed by using the annual satellite renote sensing inages fron 1974 to 2013. The re-sults show that the sandbars in north branch of Yangtze River estuary developed and disappeared constantly during the last forty years,especially,Yonglong sandbar and Xinglong sandbar were incorporated into Chongning Island gradually,and Xincun sand-bar was forned and kept growing continuously. In addition,sone sandbars in surrounding area energed,developed and disap-peared constantly. The results provide data for utilization,developnent and ecological protection of sandbars in north branch of Yangtze River estuary.