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德钦县城直溪河泥石流成灾模式及运动过程模拟

王俊豪 管建军 魏云杰 高培强 梅傲霜 张东伟

王俊豪, 管建军, 魏云杰, 高培强, 梅傲霜, 张东伟. 德钦县城直溪河泥石流成灾模式及运动过程模拟[J]. 水文地质工程地质, 2021, 48(6): 187-195. doi: 10.16030/j.cnki.issn.1000-3665.202107017
引用本文: 王俊豪, 管建军, 魏云杰, 高培强, 梅傲霜, 张东伟. 德钦县城直溪河泥石流成灾模式及运动过程模拟[J]. 水文地质工程地质, 2021, 48(6): 187-195. doi: 10.16030/j.cnki.issn.1000-3665.202107017
WANG Junhao, GUAN Jianjun, WEI Yunjie, GAO Peiqiang, MEI Aoshuang, ZHANG Dongwei. A study of the disaster model and movement process simulation of debris flow in the Zhixi River of Deqin County[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 187-195. doi: 10.16030/j.cnki.issn.1000-3665.202107017
Citation: WANG Junhao, GUAN Jianjun, WEI Yunjie, GAO Peiqiang, MEI Aoshuang, ZHANG Dongwei. A study of the disaster model and movement process simulation of debris flow in the Zhixi River of Deqin County[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 187-195. doi: 10.16030/j.cnki.issn.1000-3665.202107017

德钦县城直溪河泥石流成灾模式及运动过程模拟

doi: 10.16030/j.cnki.issn.1000-3665.202107017
基金项目: 中国地质调查局地质调查项目(DD20190647; DD20179609);第二次青藏高原综合科学考察研究项目(2019QZKK0904)
详细信息
    作者简介:

    王俊豪(1987-),男,工程师,主要从事地质灾害调查与技术研究。E-mail:278802594@qq.com

    通讯作者:

    魏云杰(1973-),男,教授级高级工程师,主要从事地质灾害、岩土工程等相关领域研究。E-mail:wyj1973@126.com

  • 中图分类号: P642.23

A study of the disaster model and movement process simulation of debris flow in the Zhixi River of Deqin County

  • 摘要: 云南省德钦县曾多次暴发较大规模的泥石流,是云南遭受地质灾害最严重的地区之一。根据直溪河泥石流的分区、物源、流体和堆积等特征,首先确定了直溪河泥石流的5种成灾模式:崩塌-碎屑流、岩质滑坡-碎屑流、土石混合体滑坡-碎屑流、松散堆积层-基岩接触面滑坡-碎屑流和松散堆积层内滑坡-碎屑流;其次,采用FLO-2D模型对直溪河在10年、20年、50年和100年一遇暴雨周期下发生泥石流时的运动情况进行模拟,定量分析了不同降雨重现期的最大流速、最大堆积深度、冲出沟口堆积距离和体积规模。结果表明:该泥石流暴发时具有启动加速度大、流速快、破坏力强、流通区长的特点;当100年一遇的泥石流发生时,其最大流速达到了3.07 m/s;最大泥深为2.27 m;泥石流冲出方量为84419 m3;致灾面积达到91600 m2。研究结果可为直溪河泥石流灾害防治与治理提供数据参考,为德钦县防灾减灾工程设计提供依据。
  • 图  1  直溪沟流域分区图

    Figure  1.  Zoning map of Zhixigou area

    图  2  泥石流调查工程部署图

    Figure  2.  Schematic diagram of the process of debris flow

    图  3  直溪沟清水流量、泥石流流量过程线

    Figure  3.  Changes in clear water flow and debris flow in the Zhixi Gully

    图  4  10年一遇泥石流堆积深度和流动速度

    Figure  4.  Depth and flow velocity of debris flow accumulation once in 10 years

    图  5  20年一遇泥石流堆积深度和流动速度

    Figure  5.  Depth and flow velocity of debris flow accumulation once in 20 years

    图  6  50年一遇泥石流堆积深度和流动速度

    Figure  6.  Depth and flow velocity of debris flow accumulation once in 50 years

    图  7  100年一遇泥石流堆积深度和流动速度

    Figure  7.  Depth and flow velocity of debris flow accumulation once in 100 years

    表  1  直溪河泥石流沟松散固体物储量表

    Table  1.   Calculations of the loose solids reserves in the debris flow gully of the Zhixi River

    物源类型滑坡崩塌坡积物残坡积物洪积物弃渣合计
    面积/(104 m2)1324147521312738
    体积/(104 m3)12736032666277552255
    可移储量/(104 m3)29182213892218
    一次最大可移储量/(104 m3)1.460.090.730.690.490.193.65
    下载: 导出CSV

    表  2  4种工况具体降雨情况

    Table  2.   Precipitation situation of four kinds of working conditions

    工况最大日降雨量/mm降雨强度/(mm·h−1)
    P=10%56.1923.04
    P=5%63.0325.84
    P=2%71.6429.37
    P=1%77.9431.96
    下载: 导出CSV

    表  3  泥石流参数取值

    Table  3.   Parameters for the debris flow

    参数重度/(t·m−3体积浓度曼宁系数宾汉屈服系数宾汉黏滞系数层流阻滞系数放大因子BF
    $ {\mathrm{\alpha }}_{1} $$ {\mathrm{\beta }}_{1} $$ {\mathrm{\alpha }}_{2} $$ {\mathrm{\beta }}_{2} $
    取值2.70.610.3、0.350.081113.720.0046211.2430002.56
    下载: 导出CSV

    表  4  不同降雨频率下直溪沟泥石流模拟结果

    Table  4.   Simulation results of debris flow in Zhixi Gully under different rainfall frequencies

    爆发周期冲出体积/m3冲出距离/m致灾(堆积区)面积/m2堆积区泥石流体积/m3堆积最大深度/m最大流速/(m·s−1
    P=10%342901272232001551321.81
    P=5%41892133433200215802.211.91
    P=2%47823144738800254912.351.96
    P=1%84419185091600598143.072.27
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-17
  • 修回日期:  2021-09-20
  • 网络出版日期:  2021-10-29
  • 刊出日期:  2021-11-15

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