辽东山区泥石流成因和危险度区划研究

THE STUDY OF CONTRIBUTING FACTORS AND DANGEROUS DEGREE DIVISIONS DEBRIS FLOW IN MOUNTAIN AREAS OF EASTERN LIAONING PROVINCE

本文从辽东山区的自然条件和人类经济活动入手,分析了山地泥石流的形成原因、特征和性质,认为本区为暴雨型泥石流,特大暴雨是触发泥石流的主导因素。地质构造、岩性、地貌等是导致泥石流的次要因素。以岫岩县为例,通过对泥石流各影响因子的综合评判,首次划分出岫岩县泥石流灾害四个级别的危险度分区,为泥石流的综合防治提供了科学依据。

The contributing factors,features and qualities of debris flows were analysed on the basis of natural conditions and human economic activities in mountain areas of eastern Liaoning Province. The paper points out that debris flow in these areas belongs to rainstorm type. In the factors that result in debris flows,torrential rain is the major factor; geological structure, rock quality and iandform are the secondary factors. This paper gives a typical example of Xiuyan County. By several on-the-spot investigations and analysing comprehensively all the effect factors, the four dangerous-, degree divisions of debris flow in this county are done for the first rime. This provides a scientific basis for the comprehensive control oi debris flow.