国道219沿线崩滑地质灾害隐患遥感调查及发育分布规律

    Remote sensing investigation and development distribution regularity of collapse and landslide geological hazard potentials along National Highway 219

    • 摘要: 国道219北起新疆喀什地区叶城县,南至西藏日喀则市拉孜县,沿线地形条件复杂、气候恶劣、人烟稀少,地质灾害隐患地面调查工作开展难度大,遥感技术是进行该地地质灾害隐患研究不可或缺的手段之一。根据遥感影像上色调、形态、纹理、阴影等特征建立崩塌隐患、滑坡隐患的遥感解译标志,在国道219沿线共识别出崩滑隐患126处,其中岩质滑坡隐患39处、土质滑坡隐患6处、岩质崩塌隐患81处。结合斜坡坡度、岩(土)体类型、地质构造和斜坡结构,分析了崩滑隐患的影响因素和空间分布规律,划分出4个集中分布区,分别为萨嘎集中分布区(Ⅰ)、索得—唐热集中分布区(Ⅱ)、日松—多玛集中分布区(Ⅲ)和西昆仑集中分布区(Ⅳ)。结果显示,位于斜坡上部的崩滑地质灾害隐患具有高位链式灾害的特征,灾害过程隐蔽性强、运动距离远、破坏性大,在地质灾害防治工作中应尤为注重此类灾害的研究。研究成果可为沿线防灾减灾工作及重大工程建设规划提供参考。

       

      Abstract: National Highway 219 starts from Yecheng County of Kashgar Area in Xinjiang in the north and ends at Lazi County of Shigatse City in Tibet in the south. The terrain conditions along National Highway 219 are complex, and the climate is harsh, with sparse population. The field survey is difficult to carry out and the remote sensing technology is one of the indispensable means for studying geohazard potentials in this area. The remote sensing interpretation signs of collapse-landslide geohazard potentials are established according to the hue, shape, texture and shadow characteristics of remote sensing images. A total of 126 collapse and landslide geohazard potentials were identified along National Highway 219, including 39 rock landslide potentials, 6 soil landslide potentials and 81 rock collapse potentials. Based on the characteristics of slope angle, rock (soil) type, geological structure and slope structure, the authors analyzed the influencing factors and spatial distribution of couapse and landslide geohazard potentials to divide four concentrated distribution areas, namely Saga concentrated distribution area (I), Suode-Tangre concentrated distribution area (II), Risong-Duoma concentrated distribution area (III) and West Kunlun concentrated distribution area (IV). The collapse-landslide geohazard potentials on the upper position of the slope have the characteristics of high-locality chain disasters, and these geohazard potentials have characteristics of strong concealment, long runout and strong destructiveness, and we should pay more attention to the study of such disasters. This research could provide some references for disaster prevention, mitigation and important engineering construction planning along National Highway 219.

       

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