基于SRTM_DEM的泾河流域特征信息提取研究  

Research on Extraction of Hydrological Information in the Jinghe River Basin Based on SRTM_DEM

作　　者：王峥[1] Nguyen Thi Tinh 马孝义[1] 尹京川[1] 胡杰华[1] 

机构地区：[1]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100

出　　处：《中国农村水利水电》2011年第11期32-36,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(50879072);国家科技支撑计划课题(2006BAD11B04);西北农林科技大学人才专项基金项目(BJRC-2009-001)

摘　　要：流域特征信息的提取对于水文地理信息分析、模拟技术和水文模型建立具有重要意义。基于STRM_DEM数据,在ArcGIS 9.3环境下,提取泾河流域坡度、坡向等地形特征,以及河网、流域边界和面积等水文要素,并划分子流域。分析表明,当阈值取5 000(40.5km2)时,生成的流域河网能够较好地反映该地区水系。根据河网分级、低级集水区域生成结果和流域地形特征,可划分为32个子流域,为流域分布式水文模型的构建提供了基础地理信息。SRTM_DEM提取泾河和部分支流流域面积误差均较小,说明提取结果与实际非常接近。结果表明,SRTM_DEM数据和ArcGIS 9.3提取流域特征信息方便快捷,具有较高的精度和准确性,应用前景广阔。The extraction of watershed feature information is significant to hydrology and geographic information analysis, simulation technology and the establishment of the hydrological model. Based on STRM DEM data in ArcGIS 9.3 environment, extraction of the gradient, aspect, the river network, river watershed boundary and area, and extracting subbasin. An analysis shows that, a threshold of 5000（40. 5 km^2 ） will make river network reflect the region water system better. According to the classification, small river catchment area and watershed topographic features,Jinghe River Basin can be divided into 32 subbasins. The relative errors of Jinghe River Basin area and some tributary area extraction are all small. Extraction results and the practical very close. The result shows that SRTM_DEM data and ArcGIS 9.3 for extraction of basin feature information has high accuracy, precision, convenient and wide applieation.

关 键 词：SRTM_DEM 泾河流域 河网 子流域 流域面积 

分 类 号：TV212.51[水利工程—水文学及水资源]