Regional Landslide Hazard Assessment And Risk Management

With the development of society and economy, human beings keep on expanding their living space to mountain areas. As a result, geohazards such as landslides occur more and more frequently in recent years. The importance of landslide hazard prevention and mitigation has been gradually taken into great consideration more than ever, therefore it is urgent to find out a realistic solution to control and manage landslide hazards. Furthermore, regional landslide hazard assessment and risk management are built upon regional landslide hazard assessment. In this paper, reasonable discussions have been dug into this research area, and major creative outcome has been obtained as follows,(1) An integrated methodology system of regional landslide hazard assessment has been established, and the fundamental framework of regional landslide risk assessment and risk management has also been refined. The objective, task, content and implementing process of regional landslide risk assessment and risk management have been illustrated systematically. Then an applicable workflow has been put forward for regional landslide risk assessment and risk management as following, objective confirmation of assessment and management - historical information collection and analysis- field investigation and monitoring of landslide hazard- database establishment for regional landslide hazards- regional landslide hazard assessment - regional landslide hazard management.(2) The regional landslide hazard has been put forward as a formal conception, and the common and difference between regional landslide hazards and the other kinds of natural hazards have been clarified. It is pointed out that both the single hazard pots and regional hazard should be taken into consideration with the same importance when carrying out regional landslide hazard assessment and risk management. The results of regional landslide hazard assessment and risk management could only be a gross generalization.(3) The principles and methods of regional landslide hazard assessment have been discussed systematically. The emphasized points are as follow. During the process of the hazard assessment, the objective should be subdivided into several sub-objectives based on geological process-mechanism analysis, and the hazard of each sub-objective should be assessed with corresponding appropriate factors respectively; To improve the accuracy of the assessment results, it is necessary to determine the actual scope and mode of how each factor impacts the developing and occurrence of landslide hazard, and to research its spatial characterization of influence and impact intensity in this scope as well; Qualitative analysis should be taken as a necessary supplement to quantitative mathematical models; Landslide hazard assessment result will not only elaborate the degree of hazard, but also will clarify the key factors to induce the hazard.(4) A realistic solution for the regional landslide hazard assessment has been provided as following procedure: analyze formation mechanism -subdivide region -analyze with mathematic model -generally assess. At the same time, this procedure has been totally integrated into GHGIS, a computing...