基于ArcGIS的丘陵山区局地水系提取及分维值估算  

Extraction of River Networks Based on ArcGIS and Estimation of Rivers' Fractal Values in Hilly Areas

作　　者：黄晶晶[1] 张卫华[1] 魏朝富[1] 

机构地区：[1]西南大学三峡库区生态环境教育部重点实验室西南大学资源环境学院,重庆400716

出　　处：《中国农村水利水电》2012年第11期1-3,8,共4页China Rural Water and Hydropower

基　　金：国家水体污染控制与治理科技重大专项课题项目(2012ZX07104-003);国土资源部公益性行业科研专项经费项目(200911015-04);重庆市工程技术中心建设项目(CSTC;2010CB7008)

摘　　要：选取重庆市綦江河流域龙仓段为研究对象,通过洼地识别、填充、水流方向以及汇流累积量的计算等一系列过程,提取出不同集流阈值下的水系并讨论了水系的分形分维特征。结果表明:①集流阈值越小,提取出的水系就越密集,同时分维值和集流阈值有着良好的对数拟合关系,说明集流阈值和分维值都能体现河网分布的复杂度。②研究区中水系分维值的极大值≤1.6,表明该水系还处于侵蚀发育的幼年期。研究局地水系的分维特征,对于局部农业发展和灌排工程的合理布局具有一定的意义。Through depression recognition and filling, calculation of flowing direction and flow accumulation in GIS, this paper ex-tracts the river networks with threshold values of various catchments, and discusses the fractaIs and fractal dimension characteristics based on the Qijiang River catchment in Longcang section, Chongqing. The results show that： （1）The smaller the threshold value is, the more intensive the river networks will be; and there is a clear logarithm relationship between the threshold and fractal dimen sion values of river networks. The results indicate that both values can reflect the complexity of the river networks; （2）In this study area, the maximum value of fractal dimension of river networks is less than 1.6, which means the river network is still in the young stage of erosion and development. It＇s significant to study the characteristics of fractal dimension for the regional development of agri-culture, and the rational distribution of irrigation and drainage infrastructure.

关 键 词：ARCGIS 提取 水系 DEM 分维 

分 类 号：S271[农业科学—农业水土工程]