ABSTRACT:

Due to a variety of factors, geological disasters occurred frequently in recent years, giving people a huge loss of life, had cause for concern. Shaanxi is the southern region of geological disasters are more serious, especially landslide hazards. This study chooses Mian County, Shaanxi Province as the study area. Mian County landslide disasters are analyzed the types, distribution, development regularities and geological environmental conditions and main influencing factors of the formation conditions of landslide disaster. To use GIS, fuzzy comprehensive evaluation to evaluate the model, and the Analytic Hierarchy Process. To select engineering geological lithologic, ground motion peak acceleration, geological structure, elevation, geomorphological types, slope, annual rainfall, human engineering activities and land use type as the main evaluation factors for landslide hazard risk assessment. Landslide hazard risk is divided into a high risk, moderate risk, low risk and extreme low risk levels.

1 INTRODUCTION

Mian County in Shanxi province is located in the western of Hanzhong City, north of the county is Qinling, Bashan is in the south of the county (Ruxton 1908). Mian County has complex geological conditions as a geological disaster prone city in our country. Landslide disasters caused serious losses to the local people. So how to make use of existing technical means and evaluation method to evaluate the county area, for the entire county of landslide risk assessment plays a decisive role (Fourie 1996).

There is no unified method and standard of the debris flow risk assessment at home and abroad at present. Especially to evaluate the whole scope of the county is still less (Collison 1996). So it is necessary to conduct the study to improve the level of debris flow risk assessment theory (Evans 1997). It will has important theoretical significance (Tang et al. 2002). At the same time, it can also provide the basis for the entire county of debris flow prevention and management. Past research emphasis of landslide disaster countermeasures is single landslide case studies, but now the emphasis on the study of landslide hazard risk assessment is area (Collison 1996). By using AHP and Fuzzy Mathematics and Geographic Information System means the combination to achieve regional landslide hazard evaluation, it can effectively overcome the impact of human factors evaluation process.

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