Research on Watershed Extraction Method Based on GIS

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Li, Yanan^1^2^3 ; Lei, Na^1^2^3 ; Xiong, Yufei^1^2^3

Shaanxi Land Engineering Construction Group Co, Ltd, Xi'an, China^1

Institute of Land Engineering and Technology, Shaanxi Land Engineering Construction Group Co, Ltd, Xi'an, China^2

Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi'an, China^3

关键词: Data-sources;    Digital elevation model;    Flow direction;    Ground elevation;    River network;    Water system;    Watershed analysis;    Watershed extraction;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022168/pdf
DOI  :  10.1088/1755-1315/300/2/022168

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Digital Elevation Model (DEM) mainly describes the ground elevation, which contains rich hydrological information and is one of the main data sources for current watershed analysis. This paper takes Fuxian County of Shaanxi Province as the research area, and uses the ASTER GDEM data of 30m resolution, based on the Hydrology module of ArcGIS10.3 platform, after the filling of the earth, the calculation of the flow direction, the calculation of the cumulant accumulation, the determination of the convergence threshold, the extraction of the river network, etc. The method of basin watershed extraction is studied and the characteristics of the basin are comprehensively analysed. The results show that when the convergence threshold is 11000, the extracted river network is closest to the actual river network, and the derivative relationship can be used to determine that the extracted river network reflects the threshold of the real water system Published under licence by IOP Publishing Ltd.