Loess Areas Of Gis-based Landslide Hazard Assessment

With constant improvement of the theories of Geography Information System (GIS) and rapid development of technology, the GIS has been widely applied to all the current fields related to spatial information beyond the initial limited field. In particular, since the new century come, the GIS theory has ripened relatively , and becomes the major tool of analysis of spatial information gradually. In recent years, along with the fast development of the economy of our country, especially with the thorough of west development, human project campaign gradually strengthened the influence of environment. In the loess area of west China, the geographical hazards especially loess landslides shows the tendency of growing. In order to solve this problem, the paper tries to apply the latest technology of GIS to the researches on the loess landslides hazards assessment.This paper focuses on the core problem of the research of landslides, landslide assessment, takes geological hazards of landslide in XiJi county as an example and attempt to use the technology of GIS in loess landslides so as to solve such problems in past as low efficiency, bad accuracy, and waste of time. Try to make the course informed and scientific. This paper constructs a workflow based on ArcGIS to have the landslide assessment withAHP. On the base of mapping unit of 30mx30m, the paper makes the assessmentof loess landslide. The research in this paper makes the following achievements:(1) A set of complete technological route and work process of loess landslide assessment based on GIS is set up specially for the loess area of XiJi county. The system includes problem analysis â†'establishment of standards â†' preparation of assessment factors â†' building landslides database â†' building model â†' confirmation of results.(2) Based on GIS, built the database of landslides in research area.(3) Based on GIS, confirmed the standards of loess landslide assessment.(4) Based on GIS, confirmed the model of loess landslide assessment.(5) Finally got the map of loess landslide assessment of research area. The result shows that the most dangerous area distributes the southwest partof Xiji where loess is sick and earthquake happens frequently. This result agrees with the actual distribution of landslides, which proves that the assessment method could be used.