| In recent years, with the development of the national economy construction, the rapid expansion of the size of the city and the construction of engineering projects, the geological hazards occur frequently and cause more and more serious threat to people’s life and properties. Therefore, it has important theoretical significance and practical value to research geological hazards and its early warning mechanism in Hunan province. It has become a leading edge task on environmental geology and a hot spot of research on academic circles to study the formation mechanism and integrate control of geological disaster. It has also been an important responsibility to prevent and reduce geologic disaster occurrence for governments at all levels. Based on detailed survey catalog and database construction of geological hazard investigation in Hunan province, the geological hazard development conditions, distribution were systematically quantitative analysed.This paper is supported by the project:Study on comprehensive integration of geologic hazard investigation and compartment in Hunan province.(Contract serial number:Ministry of finance, financial construction (2008) No.303), which is issued by the Ministry of Land and Resources and the Ministry of Finance jointly. The author have investigated geological disaster for ten years in Hunan province, based on the integration of geological disasters, multi-source geology data and the construction of spatial database, this paper expounded the development characteristics of geological disasters such as collapse, landslide, debris flow, surface collapse etc and analyzed the relationship between geological disaster and occurring disaster geological background.It also applied Support Vector Machine (SVM) algorithm to study geological disaster prevention in Ningxiang County coal dam of surface collapse area and established geological disaster prevention and control management system in Hunan province and put forward a new method scientifically using meteorological forecast and early warning of regional geological disasters. So it provides a reliable theoretical basis for early warning, prevention and control measures of geological hazard in Hunan Province.With the help of3S and spatial data technology, on the basis of the detailed investigation catalog and database construction of geological disasters in Hunan province, this paper achieved the integration of multi-source data in geological disasters and built a spatial database of geological disasters in Hunan Province.The temporal spatial distribution characteristics and development law of geological disasters in Hunan province are systematically analysed. There have happened3002geological disasters in the past10years, and there still are8475hidden troubles like landslides and surface collapse mainly. Most of the landslides distributed in western Hunan Wuling medium and large mountain area, collapse took place is relatively smaller number scattered in few counties, the debris flow is mainly concentrated in the southern Hunan Chenzhou City, southwestern Hunan the Suining County and northwestern Hunan Shimen County, and the surface collapse is mainly the mining collapse, occured in small and medium-sized coal mine.By making full use of the GIS spatial statistical analysis, overlaying analysis, buffer analysis and DEM modeling, combining with the evaluation methods like information model and factor superposition model etc, this paper studies systematicly the geological disaster formation environment, temporal and spatial distribution law and its correlation with geological environment and realizes the quantitative analysis of correlation degree between geological hazards and geological environment in Hunan province.It applys Support Vector Machine in the evaluation of geological disaster risk.With fast discriminant analysis method, it divides the evaluation unit and constructs the SVM model by training samples. Furthermore, it takes an empirical study on coal dam surface collapse area in Ningxiang County.Combined with the geological environmental conditions into the meteorological conditions and based on the information method geological disaster early warning model, the meteorological pre-warning forecast system of geological disaster is constructed in Hunan province. At the same time, through the Doppler radar image, geological hazard meteorological inversion is analysed and geological hazard identification is researched.Taking the example of Xinshao county on31, May, the retrieval technique and forms the forecasting method of geo-hazard by Doppler Weather Radar is studied. The Weather Radar image was applied to forecast the geo-hazard and the results proved the method to be practicable and precise. |
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