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云南维西哈达沟中频泥石流特征及堵溃危险性分析

王翔弘绅, 胡桂胜, 杨志全, 倪化勇. 云南维西哈达沟中频泥石流特征及堵溃危险性分析[J]. 中国地质灾害与防治学报, 2023, 34(2): 42-52. doi: 10.16031/j.cnki.issn.1003-8035.202112037
引用本文: 王翔弘绅, 胡桂胜, 杨志全, 倪化勇. 云南维西哈达沟中频泥石流特征及堵溃危险性分析[J]. 中国地质灾害与防治学报, 2023, 34(2): 42-52. doi: 10.16031/j.cnki.issn.1003-8035.202112037
WANG Xianghongshen, HU Guisheng, YANG Zhiquan, NI Huayong. Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(2): 42-52. doi: 10.16031/j.cnki.issn.1003-8035.202112037
Citation: WANG Xianghongshen, HU Guisheng, YANG Zhiquan, NI Huayong. Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(2): 42-52. doi: 10.16031/j.cnki.issn.1003-8035.202112037

云南维西哈达沟中频泥石流特征及堵溃危险性分析

  • 基金项目: 国家自然科学基金项目“国际(地区)合作与交流项目-多尺度滑坡泥石流灾害链发生机制与风险韧性管控” (41861134008);The Youth Innovation Promotion Association CAS (2020367);云南省阿瑟夫汉院士工作站 (202105AF150076);云南省重点研发计划项目(202003AC100002);云南省基础研究计划面上项目(202001AT070043)
详细信息
    作者简介: 王翔弘绅(1996-)男,四川成都人,硕士,安全工程专业,主要从事山地灾害形成机理与工程防治研究。E-mail:wangxianglaunch@qq.com
    通讯作者: 胡桂胜(1984-)男,江西九江人,博士,副研究员,主要从事山地灾害形成机理与工程防治研究。E-mail:huguisheng@imde.ac.cn
  • 中图分类号: P642.23

Characteristics of intermediate frequency debris flow and analysis of the hazard of blockage in Hada gully, Weixi County of Yunnan Province

More Information
  • 中频泥石流具有较大危险性和暴发周期较长的特点,人类活动会诱发其发生并加剧其成灾严重程度,当沟道不能满足泄流输水能力时将发生堵溃,危及两岸甚至是主河河道安全。由于目前中频泥石流危险性分析的缺乏,因此以云南省哈达沟中频泥石流为例,探讨其特征和再次发生泥石流及导致沟道堵溃的危险性,并提出防治建议。结果显示:泥石流重度1.62 t/m3,泥石流沟口流速4.794 m/s,基于暴发频率10%情况下的沟口峰值流量为54.43 m3/s以及一次冲出总量为11072.03 m3;在下游沟道处修建有涵洞,其过流量为16.5 m3/s,小于20 a一遇泥石流流量,一旦发生大型泥石流,则有堵溃危险。研究发现哈达沟中频泥石流危险度为高度危险,堵溃历史判断其再次发生沟道堵溃并有泥石流堵塞腊普河的可能性。

  • 加载中
  • 图 1  哈达沟位置

    Figure 1. 

    图 2  哈达沟地形地貌遥感影像特征图

    Figure 2. 

    图 3  崩滑堆积物源

    Figure 3. 

    图 4  沟道堆积物源

    Figure 4. 

    图 5  维西县月平均降雨量

    Figure 5. 

    图 6  哈达沟沟口处盖板桥涵特征图和腊普河主河

    Figure 6. 

    图 7  损毁居民房屋泥痕

    Figure 7. 

    图 8  堵塞隐患点3过水路面

    Figure 8. 

    图 9  哈达沟危险分区图

    Figure 9. 

    表 1  哈达沟泥石流物源汇总统计表

    Table 1.  Summary of source of debris flow in Hada gully

    物源类型坡面侵蚀物源/104 m3崩塌堆积物源/104 m3沟床堆积物源/104 m3合计/104 m3
    总量动储量总量动储量总量动储量总量动储量
    数值306.74.739.653.0512.53.68328.8511.46
    下载: 导出CSV

    表 2  不同频率H24值表

    Table 2.  List of parameters and results of 24-hour rainstorm intensity of different precipitation frequencies in Hada gully

    设计暴雨的频率P倍比
    系数Kp
    H24p
    /mm
    备注
    100年一遇最大日暴雨量(P=1%)2.11 116.05云南省水文
    手册查定
    50年一遇最大日暴雨量(P=2%)1.92105.6
    30年一遇最大日暴雨量(P=3.33%)1.7998.45
    20年一遇最大日暴雨量(P=5%)1.6791.85
    10年一遇最大日暴雨量(P=10%)1.4780.85
    下载: 导出CSV

    表 3  哈达沟泥石流流体重度查表法结果统计表

    Table 3.  List of parameters and results of basic characteristics of the Hada gully debris flow

    易发程度
    数量化评分
    易发程度
    评价
    重度
    /(t·m−3
    平均重度
    /(t·m−3
    1+φ
    γh=2.65)
    97易发1.6691.6111.701
    下载: 导出CSV

    表 4  不同频率下清水洪峰流量计算成果表

    Table 4.  List of parameters and results of peak flow discharge calculation at different precipitation frequencies in Hada gully

    设计暴雨
    频率/%
    流域汇流
    时间/h
    平均1 h降雨强度
    /(mm·h−1
    最大清水流量
    /(m3·s−1
    12.7442.9735.95
    22.4239.1531.75
    3.332.2136.3428.81
    51.9934.1326.36
    101.6630.1122.22
    下载: 导出CSV

    表 5  哈达沟泥石流流速计算表

    Table 5.  List of flow velocity results at different site location of the Hada gully debris flow

    序号平均泥深
    /m
    泥位纵坡降
    /‰
    流速系数泥石流流速
    /(m·s−1)
    1(形成区上部)2.000461107.857
    2(形成区中部)2.000416106.633
    3(形成区下部)2.000387106.538
    4(堵塞隐患点7)2.000361106.447
    5(堵塞隐患点6)1.800339106.404
    6(堵塞隐患点5)1.800332106.340
    7(堵塞隐患点4)1.600313105.371
    8(堵塞隐患点3)1.600311105.364
    9(堵塞隐患点2)1.500306104.901
    10(堵塞隐患点1
    公路涵洞)
    1.500296104.869
    111.500285104.832
    12(全流域沟口处)1.200274104.794
    下载: 导出CSV

    表 6  哈达沟泥石流其他动态参数模型

    Table 6.  List of dynamic parameter model of the Hada gully debris flow

    估算模型计算的主要参数设计暴雨频率/%参数特征值
    全沟域不同
    频率下泥石流
    流量/(m3·s−1
    Qc= QB(1+φ)Dc
    雨洪修正法[15]
    QB表4所得,
    φ=(γc−1)/(γhγc)=0.633;
    Dc取1.5,γc取1.62;γh取2.6。
    1.00 88.06
    2.0077.77
    3.3370.57
    5.0064.57
    10.0054.43
    全沟域不同
    频率下一次
    泥石流总量/m3
    Q=0.264TQC《泥石流灾害防治工程勘查规范》
    (DT/T0220-2006)附录I提供的计算公式[11]
    T=1800 s1.0017906.06
    2.0015818.86
    3.3314478.68
    5.0013132.24
    10.0011072.03
      注:表中Qc是泥石流流量。
    下载: 导出CSV

    表 7  泥石流基本特征汇总表

    Table 7.  Summary of basic characteristics of debris flow

    特征项目基本特征分类
    泥石流发生的地形条件泥石流的发生、运动和堆积过程,在发育完整的沟谷内进行,可划分为形成水源区、流通区及堆积区沟谷型泥石流
    物质组成主要为碎石土泥石型
    泥石流流体性质堆积物松散,断面无明显的分选性;流体呈稀浆状,ρc=1.62 t/m3,固体物质ρH=2.6 t/m3黏性泥石流
    固体物质提供方式上部形成水源区主要为沟道堆积物源,中部流通区主要为崩滑堆积物源及沟道堆积物源滑坡、崩塌
    水体供给雨量充沛,暴雨激发暴雨泥石流
    暴发频率现场调查,资料统计,历年不同危害程度发生中频泥石流
    灾害严重程度哈达村50户222人及启别村64户310人的生命财产安全,以及居民耕地多余0.52km2。并且威胁省道S303线香维公路的安全,总计威胁资产约5000万元,直接经济损失可达1000万元,潜在经济损失巨大。大型
    发展阶段根据物源、坡度、不良地质现象、主河变形情况判定发展期
    成因自然因素为主,人类活动影响较小自然泥石流
    规模根据泥石流一次堆积总量中型
    综合分类暴雨激发、沟谷泥石型、中型、中频发展期黏性泥石流
    下载: 导出CSV

    表 8  下游涵洞泥石流流量计算成果

    Table 8.  List of parameters and results of sediment flush-out calculation of the Hada gully debris flow in downstream culverts

    位置设计暴雨频率
    /%
    最大清水流量
    /(m3·s−1
    泥石流流量
    /(m3·s−1
    沟口涵洞136.7189.91
    232.4379.43
    3.3329.4272.07
    526.9265.94
    1022.7055.59
    下载: 导出CSV

    表 9  泥石流危险度分级标准

    Table 9.  Classification standards of hazard level of debris flow

    危险等级轻度危险中度危险高度危险极度危险
    判别标准0~0.350.35~0.60.6~0.850.85~1
    下载: 导出CSV

    表 10  泥石流危险因子等级划分

    Table 10.  Classification of hazard factors of debris flow

    评价因子数值等级危险系数
    00.40.71
    泥石流规模y1/104 m32.48≤1(1,10)[10,100)≥1000.4
    松散物源量y2/104 m3328.85≤10(10,100)[100,200)≥2001
    24 h最大降雨量y3/mm80.85≤25(25,50)[50,100)≥1000.7
    泥石流发生频率y4/%10105210
    沟谷流域面积y5/km28.79≤0.5(0.5,10)[10,35)≥350.4
    主沟长度y6/km5.02≤1(1,5)[5,10)≥100.7
    流域相对高差y7/km1.46≤1(1,1.5)[1.5,2)≥20.4
    不稳定沟床比降y80.461≤0.1(0.1,0.3)[0.3,0.6)≥0.60.7
    下载: 导出CSV

    表 11  矩阵权重计算结果

    Table 11.  Summary of matrix weight calculation results of the Hada Gully debris flow

    y1y2y3y4y5y6y7y8权重
    y1123456790.3698
    y21/212345680.1849
    y31/31/21234570.1233
    y41/41/31/2123460.0925
    y51/51/41/31/212350.0740
    y61/61/51/41/31/21240.0616
    y71/71/61/51/41/31/4130.0528
    y81/91/81/71/61/51/21/310.0411
    下载: 导出CSV

    表 12  哈达沟泥石流危险分区评述

    Table 12.  Description of hazard zones for Hada gully debris flow

    危险等级区域范围
    极危险区哈达沟中下游段至沟口腊普河河边区域,主要为历史最高泥位线以下地区,面积约0.85 km2
    危险区河沟两岸崩塌、滑坡后缘裂隙以上50~100 m的范围,面积约0.19 km2
    影响区高于危险区与危险区相邻的地区,它不会直接与泥石流遭遇,但却有可能间接受到泥石流危害的
    牵连而发生某些级别的灾害的地区,面积约0.27 km2
    下载: 导出CSV
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出版历程
收稿日期:  2021-12-29
修回日期:  2022-03-19
录用日期:  2022-04-06
刊出日期:  2023-04-25

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