Yunnan Province The Lushui Geological Disaster Prevention Zoning Study

In this paper, it systematically discusses the characteristics of development and distribution, and the forming conditions and mechanisms of the geological hazards in Lushui County with methods such as geological field investigation, data processing and model calculating. On this basis, the major indexes affecting the forming of the geological hazards are selected, and zoning of the occurrence probability of the geological hazards is made by the comprehensive information model in MapGIS. According to the distribution characteristics of towns, important engineering constructions, and local sustainable development plans, the occurrence probability of geological hazards and the importance of the assessment unit are regarded as two main indexes for constructing a model for zoning of geological hazards. The main conclusions of this research are drawn as following:(1)The main types of geological hazards in Lushui County include landslide, mud-rock flow and unstable slope, of which landslide is the most serious one. The development of geological hazards has obvious time and spatial laws.(2)The results of information value calculation show that, among the factors affecting the forming of landslides, the four attributes are gained: (D intense degree of conformation, (2) soft-rock such as argillaceous rock mass, (3) slope angle > 40° and ? human engineering activities, which are dominant. Combined with the development characteristics of other geological hazards, the occurrence possibility of them can be divided into four grades: high probability, medium probability, low probability and security.(3) According to the people-oriented principle, based on zoning of the geological hazard risks, combined with the development characteristics of the geological hazard and the danger degree, it zones Lushui County in some aspects of geological hazard prevention and control, and it divides the Lushui County into three-grade areas including the key preventing areas, the secondary preventing areas and the general preventing areas.(4) Considering the present economy level, to control geological hazards totally may be less possible and necessary. The hazards-controlling zones based on the occurrence probability of geological hazards and the importance of the assessment unit are given, which can provide scientific basis for local government to make plans for hazards control.