Landslide hazard evaluation of Zigui based on GIS information model in three gorges reservoir

The landslide hazard was evaluated based on the Zigui section in three gorges reservoir in this paper. First of all, the geology, topography and other information were analyzed to establish the landslide geological hazard database of Zigui segment; then, the digital elevation model (DEM) of such this segment was built by inputting each data in the form of map layer into the GIS (geographical information system) and combing geography information system technology; some geography information was collected, such as elevation, slope direction, gradient as well as the distance to the river; then the geological information of the research area was collected according to the geological survey data, such as formation lithology, geological structure, and so on; at last, the six indexes presented above were considered as evaluation factors to establish a landslide geological hazard model. Each information value of each layer was calculated by the model to obtain the information map of a single factor; then they were accumulated to obtain the integrate information map of the whole research area, namely, the landslide hazard shot chart. The landslide geological hazard area was divided into four grades in accordance with different shots: stability area, low-dangerous area, middle-dangerous area and high-dangerous area. It is indicated by the evaluation result that information model, which can well service the research of landslide hazard, is an effective method to carry out regional geological hazard forecast. The evaluation result can provide references for reservoir engineering safety, environmental protection as well as natural disasters prevention and reduction to realize the informationization and scientificalization of landslide geological hazard prevention and reduction.