以往研究河床演变、泥沙扩散形式、三角洲发育模式等都必须有大量的水文、泥沙、潮汐资料,还需要有实测的断面和测线来控制河床、河口及滨海海域的各要素,投入的工作量是相当可观的。但是取得的资料仍是不同步的,断续的,只是点上和线上的资料,面上的情况仍不清楚。遥感图象既能提供区域自然景观和地质构造条件方面的背景材料,多时相遥感图象分析又可获取大范围连续的同步相关资料,便于动态观测。因此,遥感图象也是研究河床演变的重要手段。目前,我国应用遥感图象研究河床演变业已开始,并在古河道的研究、讨论遥测水深和含沙量的方法、河口滨海区沿岸流、曲流演变、岸滩上河流微地貌的研究等方面都已取得良好效果。

The author investigated and studied the developing model of the Delta of Yellow river and various forms of sediment diffusion near the seashore,the stability of Meng-zheng reach of the Yellow flyer valley,the transitioonal zone from mountain to plain,and development cycles of meandering channels shaped likea "goose head" in the reach of the Yangtze River from Changjiang town to the Yangzhou,by the following means.First,with the help of Landsat images,ratio and clustering analyses werc made by the 101 image processing system,combined with the visual interpretation based on the spectrum of ground objects and their representations on images.Then the results were tested by field investigations,observational data,historical information and maps.