弃渣型泥石流输沙速率模型试验研究

发布时间：2018-04-26 10:00

本文选题：弃渣型泥石流 + 输沙速率　；参考：《长江科学院院报》2017年09期

【摘要】：近年来,弃渣型泥石流灾害时有发生。为了探索弃渣型泥石流输沙速率,以陕西省小秦岭金矿区的大西岔沟为研究背景,对大西岔沟泥石流的孕灾条件和成灾特征进行了详细的野外调查,发现该区域地形陡峻,弃渣总储量丰富,具备良好的泥石流孕灾条件。同时,泥石流在沿程运动和演化过程中,将具有明显的沿程放大和链生特征。结合野外调查资料,理论推导了弃渣型泥石流输沙速率的计算方法,并根据相似准则设计了水槽模型试验,对计算理论中的冲刷系数进行了率定。试验数据表明冲刷系数的取值范围在3.2×10~(-5)~7.1×10~(-5)m·s/kg之间。这些率定参数将用于后续的小流域泥石流产汇流过程研究之中,同时也为该区域其他相关研究以及泥石流监测预警提供科学参考。
[Abstract]:In recent years, debris flow disasters occur from time to time. In order to explore the sediment transport rate of debris flow, taking Daxichaigou in Xiaoqinling Gold Mine area of Shaanxi Province as the research background, a detailed field investigation was carried out on the disaster conditions and characteristics of debris flow in Daxichagou, Shaanxi Province, and it was found that the topography of the region was steep and steep. The waste residue is rich in total reserves and has good conditions for debris flow disaster prevention. At the same time, debris flow along the course of movement and evolution, will have obvious along the course of amplification and chain characteristics. Based on the field investigation data, the calculation method of sediment transport rate of debris flow is derived theoretically, and the flume model test is designed according to the similarity criterion, and the scour coefficient in the calculation theory is determined. The experimental data show that the scour coefficient ranges from 3.2 脳 10 ~ (-5) to 7.1 脳 10 ~ (-1) ~ (-5) m s/kg. These parameters will be used in the study of debris flow yield and convergence process in small watershed, and also provide scientific reference for other relevant research and debris flow monitoring and early warning in this area.
【作者单位】：长安大学西部矿产资源与地质工程教育部重点实验室;长安大学地质工程与测绘学院;
【基金】：国家973计划资助项目(2014CB744702) 国家自然科学基金项目(41402255) 国家科技支撑计划项目(2012BAC06B02) 中国博士后基金资助项目(2015M572512) 中央高校基本科研业务费专项资金项目(310826161025)
【分类号】：P642.23

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