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[1]LI Dong,WEI Xia,LI Xungui,et al.Sensitivity Evaluation of Freeze-Thaw Erosion in Gansu Province Based on RS and GIS[J].Research of Soil and Water Conservation,2015,22(02):1-6.

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Sensitivity Evaluation of Freeze-Thaw Erosion in Gansu Province Based on RS and GIS

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 02 Page number: 1-6 Column: Public date: 2015-04-28

Title:: Sensitivity Evaluation of Freeze-Thaw Erosion in Gansu Province Based on RS and GIS

Author(s):: LI Dong, WEI Xia, LI Xungui, LI Yaojun; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China

Keywords:: GIS; RS; freeze-thaw erosion; sensitivity evaluation; Gansu Province

CLC:: S157

DOI:: -

Abstract:: Freeze-thaw erosion is one of the three largest erosion types in plateau area, which destroys the soil properties and threatens the security of a project, at the same time, hinders the regional economic and social development, but research object on this type of erosion was rarely launched. In order to enrich the study on freeze-thaw erosion intensity and distribution, Gansu Province was taken as the case, the annual range of temperature, slope, vegetation coverage, annual precipitation and freezing and thawing period average rainfall period average minimum temperature were selected as the freeze-thaw erosion factors on evaluation indexes. With the support of RS and GIS technology, freeze-thaw erosion was evaluated by freeze-thaw erosion intensity classification in the region by using the method of comprehensive evaluation index and relative evaluation, multivariate linear regression analysis on the annual temperature range was carried out according to the measured meteorological data for many years, a regression equation more suitable for Gansu area was obtained. Definition of freeze-thaw boundary and freeze-thaw erosion intensity distribution map of Gansu were made, deepening the understanding of the area of freezing and thawing in Gansu Province, and the understanding of the erosion status. The results show that GIS and RS can rapidly provide technical support, and the sensitive areas of freeze-thaw erosion in Gansu Province mainly concentrate in the southeast of the northern direction, locate in the southeast of Jiuquan, Jiayuguan, southwest of Zhangye and the western region of Gannan, the freeze-thaw erosion area of Gansu Province is 38 800 km², accounting for 8.6% of the total area, frozen thawing erosion occurs in the areas with the least altitude between 3 300～4 400 m, freeze-thaw erosion intensity generally weakens from the southwest to the northeast.

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