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| Division of response units to earth surface processes and their extraction of topographic characteristic in the Hilly-gully Region of Loess Plateau |
| Qin Wei1, Zhu Qingke2, Zuo Changqing1, Zhao Leilei2, Kuang Gaoming2, Wang Zhaoyan1, Zhang Jingfeng1, Shan Zhijie1 |
| 1.Department of Sedimentation, China Institute of Water Resources and Hydropower Research, 100048; 2.Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing Forestry University, 100083：Beijing, China |
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Abstract The analysis and regulation of earth surface processes is an important way to ensure human living in harmony with nature. Further, dividing the response unit to earth surface processes efficiently and reasonably is an important premise for the earth surface processes research. Aim at the topography differentiation characteristics of soil erosion in the Hilly-gully Region of Loess Plateau, we put forward that the gully line, ridges line, divide line and shoulder line of valleys were extracted by overlapping in a watershed, which will benefit to make up earth surface processes response units with relatively homogeneous gradient, aspect and position of the slope. The extraction method of the gully line, ridges line, divide line and shoulder line of valleys form hydrologically correct DEM data were presented separately, and measuring technology for the topographic characteristics of response units to earth surface processes such as average gradient, overall aspect, area and perimeter were presented in ArcGIS9.2 software. It can be concluded that fast division of response units to earth surface processes were finished and their topographic characteristics were effectively extracted. The results in this paper will play an important basic function for promoting the research of earth surface processes in the Hilly-gully Region of Loess Plateau.
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Received: 25 August 2011
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