Comprehensive assessment on landslides and debris flows in Sichuan Province based on GIS and RS
Integrating the technology of remote sensing (RS) and geographic information systems(GIS), we built a comprehensive assessment information system for geo-hazards (landslides and debris flows). Locations of landslides and debris flows were established by manual interpretation after preprocessing RS images, and environmental factors were obtained through a method of GIS spatial analysis. Relationships between geo-hazard locations and each type of environmental factor were analyzed, and the factors closely related to geo-hazards were selected as the basic factors for a risk zonation. The values of the selected factors were evaluated through expert evaluation according to their relationships with geo-hazard locations, and the risk zonation was established using a method of analogy. Results indicated that the numbers of landslides and debris flows having areas >900 m 2 were 435 and 715, respectively, and that they were distributed mainly in the middle and southern parts of Sichuan Province. Slope, hypsography, lithology and rainfall were important conditions for both landslides and debris flows. Distance to a river and the degree of vegetation coverage were important for debris flows, but were of less importance for the occurrence of landslides. The regions with high risk degree were mainly in the south of Sichuan Province, especially near Panxi, and across a broad section of the middle of Sichuan Province. This research has done an effective exploration on an assessment of geological disasters using integrated RS and GIS technology, so as to provide a scientific basis for methods to prevent geological disasters.
landslides and debris-flows comprehensive assessment Geographic Information Systems remote sensing Sichuan Province
B.L. Zhang S.M. Zhang W.C. Zhou
Shandong Normal University, Jinan, China Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijin Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China
国际会议
成都
英文
491-500
2007-05-17（万方平台首次上网日期，不代表论文的发表时间）