泥石流堆积扇堵江溃决过程及堰塞坝堵江概率  

The process of debris flow fan accumulation in collapsing a river and the probability of weir blocking a river

作　　者：乔飞宇 李亚军 陈冠 孟兴民 杨云鹏 边世强 种艳 QIAO Fei-yu;LI Ya-jun;CHEN Guan;MENG Xing-min;YANG Yun-peng;BIAN Shi-qiang;CHONG Yan(School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Gansu Tech Innovation Centre for Environmental Geology and Geohazard Prevention,Lanzhou 730000,China;College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000 [2]甘肃省环境地质与灾害防治技术创新中心,兰州730000 [3]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2023年第6期778-785,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金重点项目(42130709);甘肃省自然科学基金重点项目(21JR7RA442);甘肃省重点人才项目(2022RCXM033);中央高校基本科研业务费专项资金项目(lzujbky-2021-6)。

摘　　要：结合2020年构林坪溃决型泥石流模拟试验,分析泥石流堵江过程及河流侵蚀能力,提出堵江堰塞坝堵江概率判别标准,为泥石流堰塞坝工程治理提供参考.重新定义颗粒的面积相关形状系数及体积相关形状系数,可应用于各类不规则形体.从颗粒粒度角度得出泥石流堆积“粗颗粒物质快速移动沉积-细颗粒物质慢速被侵蚀”的特征;从堰塞坝堵江过程角度得出“堆积扇逐层沉积-河流薄弱侵蚀”特征;从沉积侵蚀速率角度得到构林坪流域堵江阈值,且当泥石流颗粒粒度较细时,泥石流沉积速率对该阈值的影响将显著提高,粒度较粗时,以河流侵蚀速率为主要因素.Combined with a simulation test of Goulinping outburst debris flow in 2020,the process of debris flow damming and the river erosion capacity were mainly studied and analyzed,and the criteria for the probability of damming the river were proposed to provide a reference for the damming project of debris flow.The redefinition of a particle area related shape coefficient and volume related shape coefficient could be applied to various irregular shapes.From the perspective of particle size,the characteristics of debris flow accumulation were obtained as follows:"coarse particles move rapidly and deposit-fine particles are eroded slowly";from the point of view of the process of damming a river by weirs and dams,the characteristics of"layer by layer deposition of accumulative fan-weak erosion of rivers"were obtained;from the perspective of the sedimentation erosion rate,the river blocking threshold of the Goulinping watershed was obtained:when the particle size of debris flow was fine,the impact of debris flow sedimentation rate on the threshold would be significantly improved,and when the particle size was coarse,the river erosion rate would be the main factor.

关 键 词：堰塞坝 沉积速率 侵蚀速率 堵江过程 堵江概率 

分 类 号：P642[天文地球—工程地质学]