Development and distribution rules of geohazards in Diexi- Songpinggou scenic area in a meizoseismal area
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摘要:
以强震区叠溪松坪沟景区为研究范围区，通过多元信息手段调查，共发现地质灾害107处，其中崩塌82处，滑坡25处。地质灾害的发育分布的影响因素包括：原始坡度、高程、坡体结构、水系距离及断裂带距离等。灾害发育分布在坡度30°～50°数量多且规模大；高程2200～3400 m灾害发育数量多，尤其是高程2600～3000 m占总量的42.5%，规模则在高程为3400~3600 m较大；斜向坡体发育地质灾害数量及规模均较大，其次为顺向坡和反倾坡；水系对灾害一般最大影响距离为4.0 km，其中0～1.0 km范围内灾害发育，且规模较大；地质灾害沿地震断裂带呈次“串珠状”分布，0～2.0 km范围内最为显著发育，且符合一定的拟合规律。通过统计归纳分析，厘定了强震区叠溪松坪沟景区范围内地质灾害的发育的主要影响因素，系统的总结了其分布规律，为研究区内的基础建设以及防灾减灾提供了科学依据和参考。
Abstract:The Songpinggou scenic area in Diexi was taken as the study area and there are 107 geological disasters were found, including 82 collapses and 25 landslides in this meizoseismal area. The influencing factors of the development and distribution of geological disasters include: original slope, development elevation, slope structure, water system distance and fault zone distance. The number and scale of disasters are distributed in the slope of 30 ° to 50 ° and the number and scale of disasters are large; the number of disasters with elevation of 2200～3400 m accounts for 42.5% of the total, especially the elevation of 2600～3000 m accounts for 42.5% of the total; the number and scale of geological disasters developed in oblique slope are relatively large, followed by consequent slope and reverse slope; the maximum influence distance of water system on disaster is 4.0 km, in which the range of 0～1 km is within. The results show that the geological disasters are developed and large-scale; the distribution of geological disasters along the seismic fault zone is sub "string beads", and the most significant development is in the range of 0~4.0 km, which conforms to a certain fitting law. Based on the statistical analysis, the main influencing factors of the development of geological disasters in the Songpinggou scenic area of Diexi are determined, and the distribution rules are systematically summarized, which provides scientific basis and reference for the infrastructure construction and disaster prevention and mitigation in the study area.
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