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Author(s): |
Wenxia Qiu, Institute of Engineering Surveying, Sichuan College of Architectural Technology, Deyang, China
Zhengwei He, State Key Laboratory for Geo-Hazard Prevention and Geo-Environment Protection, Chengdu, China
Zheng Lu, Institute of Engineering Surveying, Sichuan College of Architectural Technology, Deyang, China
Huixi Xu, Institute of Engineering Surveying, Sichuan College of Architectural Technology, Deyang, China |
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Abstract: |
To evaluate the freeze-thaw erosion in study area, the comprehension assessment index was established based on weighted and additive method, using influence factors of freeze-thaw erosion, which were the annual temperature range, annual precipitation, slope, aspect, vegetation and soil respectively. Research results have shown that: the freeze-thaw erosion in study area is heavy. The extreme intensity erosion occupied the first place. The second place was the intensity erosion. Moderate erosion, intense erosion, tiny erosion and light erosion followed. During 1976-2005, the area, where the freeze-thaw erosion intensity was unvaried, was dominant. The trend of three kinds of erosion, including tiny erosion, intensity erosion and extreme intensity erosion, was upward, and the rest was downward. The area, where erosion intensity varied, distributed in low-elevation valley sides, on hills with higher elevation, in area with no or little vegetation cover, and at the junction between no-sunny and sunny slope. The total trend of freeze-thaw erosion in study area was upward, but the rate was downward. In other words, the enhancement tendency eased up.
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