四川省高速公路沿线地质灾害与小流域发育阶段的关系

Relationship between Geological Hazards and Development Stage of Small Watershed along Expressways in Sichuan Province

高速公路作为地表重要的条带状人工建筑,不可避免地受到沿线地质灾害的影响。以四川省高速公路沿线小流域为研究对象,利用地质灾害数据、ASTER GDEM数据,在水文分析的基础上,计算了小流域的面积高程积分值,分析了地质灾害与小流域发育阶段的关系。结果表明,四川省高速公路沿线地质灾害多发生在小流域的壮年期,以及部分老年期;人类工程活动是诱发老年期流域地质灾害的因素。研究结果为高速公路沿线地质灾害易发性评价提供了更宏观的地形特征参考。

As an important strip artificial building on the land surface,expressway is inevitably affected by geological disasters.In the paper,the small watershed along expressways in Sichuan province are taken as the research object,by means of geological disaster data and ASTER GDEM data,on the basis of hydrological analysis,the Hypsometric Integral value of small watershed is calculated.The relationship between geological disasters and the development stage of small watershed is analyzed.The results show that geological disasters along expressways in Sichuan Province mostly occur in the maturity age of small watersheds,'as well as in some old ages.Human construction activities are the factors that induce geological disasters in the old age watershed.The research results provide a more macroscopic reference for the evaluation of geological disaster susceptibility along the expressway.