[1]LI Yimin,YUAN Jing,JIANG Deming,et al.GIS-Based Risk Assessment of Landslide Disaster in High Mountain Valley[J].Research of Soil and Water Conservation,2021,28(03):355-363.
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GIS-Based Risk Assessment of Landslide Disaster in High Mountain Valley
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 03
Page number:
355-363
Column:
Public date:
2021-04-20
- Title:
- GIS-Based Risk Assessment of Landslide Disaster in High Mountain Valley
- Keywords:
- landslide; high mountain canyon area; GIS; analytic hierarchy process; information model; risk assessment
- CLC:
- P954
- DOI:
- -
- Abstract:
- In order to deepen the understanding of landslide disasters in Lushui City and meet the actual needs of disaster prevention and mitigation in Lushui City, the development characteristics and formation mechanism of the landslide in Lushui City were analyzed based on the data of 235 landslide disaster points. Combined with correlation analysis, 8 factors including slope, elevation, road, water system, stratigraphic lithology, fault, land use type and rainfall were selected to build a risk assessment index system. Based on GIS technology, the relationship between each index and the relative density of landslide disaster points was analyzed, and each index was graded. The analytic hierarchy process and information model were used in evaluation and zoning of the landslide hazard risk in the study area. The results show that:(1)landslides in the study area are prone to occur between slopes of 30°～50° and elevations less than 1 900 m; soft rocks or soft-hard rock layers in the area are more likely to cause landslide hazards; the closer to the road, fault zone and river, the greater the possibility of landslide disaster; the rainfall also has the impact on the occurrence of landslides; the probability of landslides increases with the increase of rainfall; construction land and cultivated land are prone to landslide disasters;(2)the extremely high and high risk areas of landslide hazards in the study area mainly distributed on both banks of rivers and roads where human activities are strong;(3)the areas of extremely high, high, medium and low risk areas are 448.75 km2, 848.51 km2, 1 011.61 km2 and 779.54 km2, respectively; the extremely high and high risk areas only account for 42% of the total area of the study area, but contain 86.81% of the landslide disaster points, and the landslide density is as high as 0.157 3 km2, indicating that the landslide risk in this area is high.
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Last Update:
2021-04-20