漓江下游河流地貌50年变化的高分遥感影像解译分析

Analysis of fluvial landform change of Lijiang River downstream reach in 50 years based on high resolution remote sensing image

以美国1962年的高分辨率间谍卫星KH-4和2012年我国高分辨率资源卫星ZY-3的遥感影像为信息源，对桂林漓江下游上龙-木桥背河段河流地貌50年发生的变化开展了对比研究，旨在寻找漓江河流地貌的变化规律。通过基于ENVI的图像处理和MapGIS的目视解译，对两时相下的河流边滩、江心洲、凹凸岸个数、曲率和河段面积等地貌信息进行了测量和计算，在此基础上开展统计和对比分析，结果表明：（1）区内边滩有的在逐渐消亡，有的在加深堆积，状态并不统一；江心洲的面积和周长均有所增大。（2）凹凸岸规模变中有稳的趋势，长度为1～2 km和3～4 km的个数在减少，而2～3 km的个数则在增加。（3）河段曲率、河段面积及周长都有减小的趋势。

The variation about fluvial landforms of Lijiang River is carried out in an comparative analysis of the downstream reach of the Lijiang River from Shanglong to Muqiaobei for 50 years of changes about fluval land-forms,based on remote sensing image from the high resolution spy satellite KH-4 of America in 1962 and high resolution resources satellite ZY-3 of China in 2012.Measurement and calculation of the geomorphic information are used such as point bar,middle bar,number of concave-convex bank,curvature and river area under two images in different times based on the image processing with ENVI and visual interpretation with MapGIS.Three aspects of investigation conclusions are got through statistical and comparative analysis based on the form work. The state of point bar is not stable and unified in the region:some in the dying,some in the deepening accu-mulation.Area and perimeter of middle bar increased some during the same period.The scale of concave-con-vex bank trends to change but stable.The number decreases when scale length is 1 -2 km and 3-4 km,and 2-3 km increasing.The curvature viver area and perimeter show the reduction tendency.