基于DEM的西辽河流域河网水系提取研究  

Research on Drainage Network Extraction of Western Liaohe River Basin Based on DEM

作　　者：靳晓辉[1] 何俊仕[1] 董克宝[1] 

机构地区：[1]沈阳农业大学水利学院,辽宁沈阳110866

出　　处：《节水灌溉》2014年第10期43-45,共3页Water Saving Irrigation

基　　金：水利部公益性行业科研专项:"西辽河平原"水-生态-经济"安全保障研究"(201101021)

摘　　要：河网水系是对流域进行水文分析的重要数据,其生成的准确性会直接影响水文模型模拟的精度。以西辽河流域为研究区,在ARCGIS软件操作平台上对研究区的数字高程模型数据进行河网水系提取,设定不同的流域汇流累积阈值,分别计算出各模拟河网的分形维数及河网密度,取二者拟合趋势变化相同处阈值对应的河网与实际河网进行比较,发现此处的模拟河网与实际河网具有较高的拟合度,从而避免阈值确定的随机性、主观性等问题,有效地提高流域河网水系提取的精度。Drainage network is the important data for watershed hydrological analysis, and its accuracy will directly affect the preci- sion of hydrological model simulations. In this study, the Western Liaohe River Basin is taken as a research area, the drainage net- work extraction is carried out through ARCGIS software based on the digital elevation model data of West Liao River Basin. The fractal dimension and drainage density are calculated in each simulative river network under different flow accumulation threshold, then the simulative river network at the same fitting trend of the two indicator parameters is taken to compare with the actual river. It is found that the former is most close to the actual river. This method avoids randomness and subjectivity on the threshold deter- mination, and effectively improves the accuracy of drainage network extraction.

关 键 词：河网水系 分形 河网密度 阈值 

分 类 号：TV212[水利工程—水文学及水资源]