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Loess area based on GIS Landslide Hazard Assessment

Author: GaoYu
Tutor: ZhangJun；LuYuDong
School: Chang'an University
Course: Environmental Engineering
Keywords: Loess area Landslide Risk Assessment Geographic Information Systems Database AHP
CLC: P642.22
Type: Master's thesis
Year: 2005
Downloads: 375
Quote: 9
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Abstract


With GIS (Geography Information System - GIS) theory of continuous improvement and the rapid development of techniques, GIS technology has been initially limited the scope of application was extended to almost all areas related with spatial information. Especially in the new century, GIS theory has been more mature, and gradually become the main tool for analysis of spatial information. In recent years, as China's rapid economic development, especially with the depth of western development, human engineering activities impact on the environment and gradually strengthened. In our country, especially the western ecological environment is fragile loess area, geological disasters, especially landslides, there have been a growing trend. This paper attempts to apply GIS technology to loess landslide hazard assessment to go, designed to quickly and efficiently identify the loess landslide hazard. This paper studies landslide core issue - hazard evaluation to Xiji County landslide, for example, try loess landslide hazard assessment in the integration of geographic information system technology to address disaster risk assessment in the past low efficiency, accuracy, time-consuming problems, achieve loess landslide hazard evaluation of information technology and scientific. This paper constructs an ArcGIS geographic information system platform, using AHP loess landslide hazard evaluation of the entire process. And using 30m × 30m evaluation unit, Xiji County study area on loess landslide hazard assessment, the resulting landslide hazard map and the investigation that the distribution of landslide-prone areas in good agreement. Through this research, mainly achieved the following results: (a) typical for Xiji County loess landscape environment, the establishment of a more comprehensive GIS-based landslide hazard assessment loess region's technology roadmap and working methods. Including problem analysis → → Evaluation Index System Risk Assessment factor selected database construction → → → risk assessment model results. (2) the construction of the study area based on GIS landslide database; (3) to determine the GIS-based landslide hazard evaluation; (4) identified the GIS-based landslide hazard assessment and mathematical models are applied; (5) Final generated in the study area landslide hazard zoning map extent; (6) The results show that the study area Xiji County landslide hazard areas are mainly distributed in the most southwestern county loess layer is thick, the higher the peak ground motion hilly loess region . This survey obtained with the actual landslide-prone area maps agree well, indicating that this institute evaluation method used is feasible.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Engineering Geology > The geological and engineering geological > Landslide
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