| Extraction and analysis of hydrological characteristics of Yanhe watershed based on DEM |
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| DOI：10.7606/j.issn.1000-7601.2012.04.36 |
| Key Words: digital elevation model (DEM) Yanhe watershed extraction of hydrological characteristics drainage water threshold |
| Author Name | Affiliation | | SONG Xiangyang | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WU Faqi | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHAO Longshan | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WU Guangyan | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Qingfeng | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| According to the algorithm for cross flow simulation of surface runoff combined with the tool of hydrological analysis in ArcGIS software, hydrological characteristics of river system in Yanhe watershed and related information were extracted based on the DEM data and were also compared with the digital water system on 1∶25 topographic maps. The results showed that the drainage water threshold was the key parameter for the extraction accuracy of water system, and the greater of drainage water threshold, the fewer and thinner of extracted water system; the smaller of drainage water threshold, the more concentrated of extracted water system vice verse. The number of river source, density of water system, class of river and the total river length decreased as drainage water threshold increased, but the main river length changed slightly. When threshold was 5.51 km2, water system extracted was relative coincident with the actual condition. Hydrological characteristics of river system in watershed and sub-watershed of Yanhe wa
tershed were extracted based on the DEM data with 90 m resolution, which was feasible and could provide service for the construction of digital watershed and the management of basin water resources. |
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