南黄海辐射沙脊群地形遥感识别及分析

Identification and Analysis of the Radial Sand Ridges in South Yellow Sea Based on Remote Sensing Technology

为认识南黄海辐射沙脊群的分布演变规律,并为海洋发展战略的实施提供参考资料,在综合分析国内外沙脊线以及中轴线提取方法的研究现状基础上,以南黄海辐射沙脊群为研究区,将遥感技术与中轴线、沙脊线结合形成遥感沙脊线法和遥感中轴线法,提取潮汐水道的平面中轴线和沙脊的沙脊线以进行沙脊群的动态演变监测。选用1992至2009年间4景TM遥感影像对辐射沙脊群地区进行沙脊线和中轴线提取,综合分析后得出以下结论:(1)黄沙洋中轴线的头部变化不大,分支点在17年间不断变动,尾部向北移动了3 383米。(2)苦水洋中轴线的变化很大,头部分支点向东南移动,中轴线后段完全变向。(3)西洋主轴尾部变化并不大,1992年后西侧的一支逐渐消失,未消失的两支在多年后又汇聚成新的一支。(4)东沙沙脊线主轴由一个分支变为两个分支,主轴弯曲程度逐年增加,并整体向东北移动。

This paper aims to understand the rules and changes of the radial sand ridges in South Yellow Sea,as well as reference to the implement of ocean development strategy.Combined remote sensing technique,sand ridge line and axis line,the remote sensing sand ridge line method and remote sensing axis line method are conceived,which are applied to our research region.The sand ridge lines and axis lines in radial sand ridges were extracted and studied based on four TM images from 1992,1996,2000 and 2009.The results showed that：（1）In Huangshayang,the start of centerline changes a little,however the branch point varies a lot during 17 years.The end of centerline moves northward 3,383m.（2）In Kushuiyang,the centerline changes significantly.The main changes are change in branch point nearby start of the line,and change in direction in end of the line.（3）In Xiyang,the centerline changes a little in end section.The west brancn disappeared after 1992,and the left two branches recombined into one branch.（4）A new branch formed in Dongsha,and the sand ridge line changes significantly,the middle of the line becomes like shape S.The line has the trend to move northward as a whole.