摘要
为探明杰仲沟流域上游的潜在物源在极端条件下形成泥石流灾害,对沟口建筑及G318国道的危害性。以实地无人机拍摄数据为基础,通过三维建模生成研究区高精度的数字高程模型(DEM),再利用基于泥石流运动深度积分的Massflow数值分析方法,模拟泥石流的运动过程。首先分别用两种模型(Voellmy模型和Manning模型)对已发生的泥石流灾害进行了模拟,将模拟结果与现场实际情况进行对比验证,选取了结果更精确地Manning摩擦模型并确定了相应运动参数,在此基础上对体积为3.0×105 m3的泥石流灾害进行了预测模拟评估。通过对模拟结果进行分析处理,划定了研究区内的四个危险区,为泥石流灾害的防治规划和设计提供了有效的参考依据。危险区A位于泥石流沟第一个弯道处,该区及以南区域,泥深和流动强度都较大,但该区域人类活动较少;危险区B位于第一个弯道与第二个弯道之间,危险区C位于第二个弯道处,这两个区域内泥深较大,局部区域流动强度较大,极端条件下,危险性相对较高;危险区D位于国道南侧,该区域流动强度相对较小,但流体在此区域易发生堆积,所以应提高公路下涵洞的排导能力。
In order to find out the potential sources in the upper reaches of the Jiezhonggou watershed, debris flow is formed under extreme conditions, which is harmful to the trench building and the G318 National road. Based on the UAV data, the high-precision digital elevation model (DEM) of the study area is generated by three-dimensional modeling, and the motion process of debris flow is simulated by using the Massflow numerical analysis method based on the depth integral of debris flow motion. Firstly, two models were used to simulate the occurrence debris flow. The more accurate Manning model was selected by comparing the simulation results with the actual situation. On this basis, a volume of 3.0×105 m3 of debris flow is simulated to predict and evaluate the disaster. Through the analysis and processing of the simulation results, four risk zones in the study area are delineated, which provides an effective reference for the prevention and control planning and design of debris flow disasters. The risk zone A is located at the first bend of the debris flow gully. The depth and flow intensity are relatively large in this area but the human activities in this area are less;The risk zone B is located between the first bend and the second of the debris flow gully and the risk C is located at the second bend. The depth is relatively large in these two areas and the flow intensity is large in local area. In extreme conditions, the risk of zone B and C are relatively high;The risk zone D is located on the south side of National highway. Though the flow intensity is relatively small, the fluid is prone to accumulation in this area, so the conductivity of culvert under highway should be improved.
作者
段学良
马凤山
郭捷
孙琪皓
DUAN Xueliang;MA Fengshan;GUO Jie;SUN Qihao(Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Institutions of Earth Science,Chinese Academy of Sciences, Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国地质灾害与防治学报》
CSCD
2019年第6期25-33,共9页
The Chinese Journal of Geological Hazard and Control
基金
第二次青藏高原综合科学考察研究专题
