| Geological disasters, referring to the course of development in the evolution of the Earth, the catastrophic geological events as the formation of a variety of natural geological processes and the result of human engineering activities. Due to natural variability and anthropogenic effects caused by geological disasters occur, such as landslides, avalanches, landslides, etc, each year cause abnormal damage to human society. In spite of China in the field of geological hazard category has achieved fruitful results during the past several decades, but, In comparison to Compared with the advanced developed countries level, there are still some differences. Screening and analysis on the regional geological hazards assessment factors, liability, and risk evaluation, there are many problems worth exploring.Mao-xian is located on the eastern edge of the zone, the terrain is abnormal complex geological conditions, geologic hazard are well developed, the distribution of disaster over a broad area, the higher the frequency, is one of the hardest-hit counties southwest valley deep geological disasters is also on the regional geology disaster characterize good experimental base susceptibility evaluation and risk assessment. Thesis Mao-xian for example, relying on the "deep valley southwest slope investigation and assessment of geological disasters" Work project, in 1:50,000 geological disasters basis of detailed investigation and interpretation of remote sensing data, the creation of detailed geological disasters catalog database. On the development and distribution of geological disasters were analyzed quantitatively, and the susceptibility and risk analysis and evaluation of geological disasters in the study area, At the same time, based on analysis of geological disaster-prone nature and risk assessment methods, analysis and comparison the applicability of the various evaluation model with the advantages disadvantages.Finally it is concluded that the study area regional geological hazards and risk zoning map. The main results are set out below:1、 initially revealed the characteristics and distribution of development Mao-xian geological disasters. Types of geological disasters in the region including landslides, avalanches. Geological disasters mainly concentrated in rivers, Serious human activity areas. Among them, The most widely distributed landslide, against the most dangerous. The main factors controlling the geological environment of the study area is the area of geological hazards:River erosion, Type in geotechnical engineering, topography and fracture, and predisposing factors of geological disasters mainly rainfall and human activity.2、The mapping unit fall into five categories: the geographical unit, the grid unit, uniform conditions unit, terrain and slope unit cell. Papers were evaluated based on regional geological disasters study based on the need to select the grid cell.3、Established a more perfect evaluation index system of regional geological disasters, after the combination of quantitative and qualitative mutual way, systems analysis describes the relationship between the geological disasters and other evaluation factors between. Thesis using the analytic hierarchy process, the amount of information law, the right to information law, Logistic regression, fractal theory, gray clustering method, fuzzy comprehensive evaluation, artificial neural networks and support vector machines and other methods of analysis and evaluation of the susceptibility in this Based on the method of using the product and integrated risk analysis method were evaluated. Finally, the susceptibility divided mao-wen Qiang Autonomous geological disasters as four partitions, respectively: high-prone areas, in prone areas, low-prone areas and no-prone areas. Hazard is also divided into four partitions, namely:high-risk areas, the danger zone, low-risk areas and non-hazardous areas. |
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