| With the continuous development and improvement of geographic information and remote sensing technology , geographic information and remote sensing technology has been widely used in all areas of geological disaster hazard assessment ,which provide a scientific basis for the prevention and mitigation plan as well as the development and deployment of control works. In recent years, as the rapid development of China's hydropower projects, geological disasters occur frequently in the western mountains, of which landslides, avalanches and debris flow are most common. These geological disasters seriously affect the safe operation of the Dadu River in the reservoir area,and objectively require increased geological survey and improve the level and quality. This requires geographic information and remote sensing technology,which can speed up the progress of geological prospecting, expand the scope of geological survey, improve accuracy and efficiency of the geological survey.As a whole geological survey work for the reservoir area,it provides a convenient means. This article attempts to use geographic information and remote sensing technology to Dagangshan geological hazard assessment,so to quickly and effectively investigate and evaluate on the Dadu River Dagangshan geological disaster situation and development trend . Finally, it provides a scientific basis for disaster prevention and mitigation plan.In this paper, Dagangshan geological hazards are used for the study, by field survey and wordview2 high-precision remote sensing images, Dagangshan reservoir characteristics and distribution law of geological disasters are researched. Spatial analysis and overlay analysis methods of geographic information system are also used to research Dagangshan geological disasters risk survey and evaluation. Achieved the following results: (1)The spatial resolution of wordview2 high-precision remote sensing image is up to 0.5 meters, and has a strong ability to grasp compared to traditional field survey. It understands a wide range of the geological structure of the surveyed area, the development and distribution of adverse geological features,such as landslides, avalanches and debris flow. So it can make space determine and analysis of the geological conditions.In this paper, results of remote sensing interpretation and field survey data are used to interprete landslides, avalanches and debris flow respectively. There are 11 avalanches, 14 landslides, 7 debris flow. As the results, Dominated by landslides and avalanches, In area, landslides are slightly larger than avalanches.(2)In this paper, remote sensing images and DEM data of the study area are used to establish three-dimensional remote sensing model to obtain a clearer visual image data of geological disasters. The topography, geological structure, distribution of active faults, water, hydro-geological phenomenon,geological external power phenomenon and Quaternary distribution,vegetation species distribution and land utilization, etc along are interpreted.(3)This paper used GIS space analysis function and combined geological disaster situation, discussed the relationship.between the stratigraphic lithology, terrain elevation, terrain gradient, terrain slopes, water system, geological structure and the spatial distribution of geological disasters.(4)This paper against the core study of the area mail hazards—the risk of hazard assessment, With geographic information technology as the main research platform, Selected terrain gradient, terrain slopes, land use types, vertical distribution, stratigraphic lithology, the tectonic line distance, the distance from the water system of the distance from the road,, the earthquake intensity and volume 10 geological disaster evaluation factors, combined research area geological disaster situation used AHP to identify factors weights and establishing risk evaluation model. The resultthe development present situation ofgeological disasters instudy area anastomosishas some of the usefull value. |
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