长江江苏段岸线资源评价因子的定量分析与综合评价

Assessment and quantitative acquirement of factors for evaluating bank resources of the Yangtze River in Jiangsu province

评价因子的选择与定量获取是长江岸线资源评价的重要内容。以岸线稳定性、岸前水深、岸前水域宽度以及岸线陆域宽度作为评价因子,在GIS支持下,应用叠加分析与格网分析等技术方法,定量评价岸前水深和岸前水域宽度,对其中的技术环节作了详细说明;应用分形理论,对江苏长江段岸线以及可能影响岸线稳定性的岛屿进行了分形分维数计算,并以此为基础,应用多时相的卫星影像以及一些辅助资料来判断局部岸线的稳定性。在对4个单项因子评价单元的基础上,通过GIS叠加分析获取岸线的综合评价单元,应用因子赋分的方法对每一单元岸线进行综合评价。

How to select and quantitate the corresponding factors is one of the important conten - ts to evaluate the waterfront resources of the Yangtze River.The factors in this study include riverbank stability,water-front depth,water-front breadth and water-behind land width.With the help of GIS,overlapping and grid technique are used to quantitate and analyze the water-front depth,water-front breadth and the water-behind land width.And the paper discusses the process on how to acquire all the above - mentioned parameters by applying the correlative technique in detail.In order to find out and quantitate the factors affecting the bank stability,the fractal theory is applied to compute the fractal dimensions of riverbank and islands of the Yangtze River,and on the basis of the mentioned above,multi-temporal satellite imageries and other factors are used to estimate the local bank stability.The integrative evaluation units are acquired from overlapping each of the mentioned evaluation units.Finally,the integrative evaluation is done on the basis of the evaluation units.