基于GIS的长江口北港冲淤演变及河道特征可视化分析

以1964 2002年多幅不同年代的长江口北 港海图为基础资料，利用GIS和DEM相结合的方法，并借助于三维河道冲淤演变立体图和冲淤 量数据，分析了北港的冲淤演变和河道特征演变。结果表明：1964 2002年，北 港河段整体表现为冲刷，泥沙冲刷量为3.775亿t；在38年里北港河道的断面形态经历了 从两槽一脊向三槽两脊以及三沙四沟的复杂演变。研究方法可在今后河势分析、河道整治研究中加以应用。

Visualization Analysis on Evolution of Erosion and Deposition and Channel Character in North Harbor of Yangtze River Estuary

This paper takes lots of ocean charts on North Harbor of Yangtze River estuary from 1964 to 2002 as basic data,using the method of combining GIS with DEM,and by means of three dimension river course erosionand deposition(EAD) evolution relief map and the EAD statistic data,and then does EAD analysis and river course character evolution analysis for North Harbor.The results indicate that: firstly,North Harbor generally shows erosion character from 1964 to 2002,the amount of sand erosion is 0.377 5 billion t;secondly,the com-plex evolution process of North Harbor River course character represents from two troughs one ridge to three troughs two ridges and then three sand-banks four channels during the 38 years.The research method can be ap-plied into river shape analysis and river course realignment study in the future.