Eco-geological vulnerability assessment based on major controlling factors: A case study of Xichang City, Sichuan Province
ZHANG Jinghua1(), OUYANG Yuan1(), LIU Hong1,2, HUANG Hanxiao1, ZHANG Tengjiao1, LI Fu1, LI Tong2
1. Chengdu Center of China Geological Survey, Chengdu 610081, China 2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
The eco-geological vulnerability assessment of Xichang City, Sichuan Province was performed in this study to provide bases for the ecological protection and restoration of the city. Firstly, an assessment indicator system was constructed, for which 10 major influencing factors of the eco-geological vulnerability in Xichang City were selected according to the eco-geological survey and comprehensive research. Then the eco-geological vulnerability assessment of Xichang City was conducted using the improved analytic hierarchy process (AHP) and the geographic information system (GIS). The results are as follows. Xichang City suffers from vulnerable eco-geology. The areas with moderate-high eco-geological vulnerability account for 50.14%, although no areas suffer extreme eco-geological vulnerability. The areas not suffering eco-geological vulnerability and those with slight eco-geological vulnerability are concentrated in the Anning River valley and the Qionghai Lake Basin, while the areas with moderate-high eco-geological vulnerability are mainly distributed in the Maoniu Mountain area in the western part of Xichang City and the Luoji Mountain area in the southeastern part of the city. Overall, the whole city includes five areas with eco-geological vulnerability, namely two areas with slight eco-geological vulnerability in the Anning River Valley (I) and Daqing (II), one area with moderate eco-geological vulnerability in the Baru-Ma’anshan area (III), and two areas with high eco-geological vulnerability on the western slope of the Luoji mountain (Ⅳ) and in the Maoniu Mountain (Ⅴ). Different ecological protection and restoration schemes and different development and construction measures should be implemented for different eco-geologically vulnerable areas in the city.
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