摘要:
本文在对黄河上游地区崩塌、滑坡、泥石流进行野外地质调查和资料收集的基础上,确定了灾害风险评价的主要影响要素和指标体系,进行了以县(市、旗)为单元的风险评价。评价单元共116个。研究区地质灾害风险共分为5级,高风险单元3个,较高风险单元8个,中等风险单元24个,较低风险单元54个,低风险单元27个。风险评价结果表明,评价区内不同地区崩滑流灾害风险程度相对差异较大,总体分布特点是中部地区较高,北部和南部较低。从风险指数的结果来看,有些风评价单元的风险指数非常接近临界值,一旦危险性条件和易损性条件发生改变,将会引起地质灾害的风险级别发生变化。因此,在西部大开发的进程中,无论是在开发资源还是进行各种工程活动,都应注意保护环境,避免地质灾害向着严重的方向发展。
Abstract:
Based on field geological investigations of avalanches,landslides and mudflows in the upper reaches of the Yellow River,the authors determined the main influence factors and index system of the hazard risk evaluation and made risk evaluation with the county(city or qi) as a unit.There are a total of 116 units in the study region and the geological hazard risk is divided into 5 grades.There are 3 high risk units,8 relatively high risk units,24 moderate risk units is three,54 relatively low risk units and 27 low risk units.The results of risk evaluation indicate that the risk grades of avalanche,landslide and mudflow hazards differ greatly in different area of the region.The general distribution pattern is as follows:the risk is higher in the central area and lower in the north and south.The risk indices show that the risk indices of some risk units are very close to the critical value,and once the dangerous conditions and vulnerable conditions change,the risk grades of geological hazards would change accordingly.Therefore during the development of western China,whether for mineral exploration and mining or for various engineering operations,we should pay attention to environmental protection so as to avoid aggravation of geological hazards.
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