Study On The Model Of Risk Assessment Of Landslide Hazards Based On GIS Technology

It is important for landslide stability analysis and risk assessment in the research of a slope. There is much data to be dealt with in spatial area in the process. The Geographic Information System (GIS) is suited to do spatial analysis and corresponding data management. This paper explores in the research of slope stability and risk assessment using GIS. Firstly, the research situation abroad and at home is discoursed in this field. Secondly, this paper qualitatively and quantitatively analyzes and classifies the influence factors of landslide. In qualitative analysis, the internal and external causes of landslide are discussed, and in quantitative analysis, the parameters of commonly used in current slope stability calculation theories are analyzed. After this, disasters-causing factors are selected and adjusted according to the site situations. Then a modified quantitative model of risk assessment is established. It should be noted that the model is semi-quantitative because the disasters-causing factors cannot be quantitatively implemented at the present time and the rule of assessment hazard vulnerability isn't established. The modified model from the UN's model of risk assessment considers the difference between possible real loss and assessment loss. This paper also introduces the building of database on landslide risk assessment system. After the merits and defects of three redevelopment methods of the GIS tool software being compared, the integration redevelopment methods based on COM are recommended. The results of research are applied in the GIS based information system of landslide risk assessment in Mountain Lion. The assessment result almost corresponds with the real situation, so the validity and practicability are identified.