川藏公路然乌——波密段泥石流分布规律和发育特征

The Study on Regularities of Debris Flow's Distribution and Characteristics of its Development along Ranwu-Bomi Segment of Sichuan-Tibet Highway

川藏公路然乌—波密段是我国冰水泥石流发育地段,泥石流危害严重。在野外调查的基础上,利用Arc GIS平台,对该区域泥石流的分布和发育特征进行了研究。结果表明,研究区泥石流类型主要以冰水型泥石流为主,泥石流性质多样,且以稀性为主,流域形状多呈长条形;泥石流分布密度大,且不同地段分布的泥石流类型不同,不同类型泥石流的面积差异大,暴发时机不同。为了保障G318线的安全运营和人民生命财产安全,建议加强研究区内冰川、冰湖的监测,并做好泥石流的监测预警工作。

There are vast and serious debris flows along the Ranwu-Bomi segment of Sichuan-Tibet highway. Based on the field investigation,this paper studies the distribution regularities and development cheracteristics of debris flows by using the Arc GIS software. The results show that it is mainly glaciofluvial debris flow in this area. The properties are diversified and are mostly diluted debris flows. The watershed morphology is primarily rectangular. The different types of debris flows are in different segments with densified distribution. The different types of debris flows break out at different times with great different areas. For protecting the G318 line ＇ s safe operation and people ＇ s lives and property,it is suggested to strengthen the monitoring of glaciers and glacier lakes and warn debris flows in the study area.