安宁河断裂带勒帕沟泥石流发育特征及防治建议

张瑞端; 郭长宝; 张永双; 付晓晓

安宁河断裂带勒帕沟泥石流发育特征及防治建议

张瑞端^{1, 2,},
郭长宝²,
张永双²,
付晓晓^{1, 2}

1.
中国地质大学(北京)工程技术学院, 北京 100083
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

科技基础性工作专项 2011FY110102

中国地质调查局项目 1212010914025

国家科技支撑计划课题 2011BAK12B09

国家科技支撑计划课题 2012BAK10B02

详细信息

作者简介:
张瑞端（1988-），男，硕士研究生，地质工程专业，主要从事工程地质与地质灾害方面的研究。E-mail：252273689@qq.com

中图分类号: P642.23
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- 文章访问数: 155
- HTML全文浏览量: 54
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2013-12-11
- 刊出日期: 2014-06-28

DEVELOPMENT CHARACTERISTICS AND PREVENTION SUGGESTIONS OF THE LEPA DEBRIS FLOW IN THE ANNING RIVER FAULT ZONE

1.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 2011年6月17日，勒帕沟发生近50年来最大的一次泥石流，经计算泥石流断面平均流速为2.03 m/s，峰值流量为200.11 m³/s，为大型泥石流，对帕勒村村民生命财产造成了巨大危害。勒帕沟上游岸坡前缘不稳定斜坡体及勒帕沟沟道内松散堆积的卵砾石为勒帕沟泥石流的主要物源。上游支沟中碎屑物块度较小，易被水流冲走，不会形成堰塞湖和溃决型泥石流。勒帕沟流域现今仍有再次暴发泥石流的可能，建议于流域中上游进行人工植树造林，在下游清理河道，进行监测预警，以实现泥石流综合防治。
- 安宁河断裂带 /
- 勒帕沟 /
- 泥石流 /
- 发育特征
Abstract: The paper gives careful calculations of the maximum debris flow in the Lepa gully in June 17^th, 2011, the extraordinarily serious debris flow calamities in the last fifty years. By calculation, the mean velocity of the debris flow was 2.03 m/s with a peak discharge of 200.11 m³/s. The unstable slopes in the front edge of the upper Lepa gully's river bank together with those gravels overlapped on its riverbed proved to be the main solid substance source of the Lepa debris flow. The diameter of the clastics' particle in the upper branch was small, so they are prone to be swept away by floods in the gully rather than resulting in the formation of barrier lakes or extraordinarily serious debris flow calamities. Currently, Lepa gully still has possibility of debris flow's breakout, suggestions lie in planting trees in the upper and middle reaches of the gully, cleaning riverbed in the lower reaches, setting up monitoring and warning system, to prevent the debris flow.
- Anning River fault zone /
- Lepa gully /
- debris flow /
- development

HTML全文

图 1 勒帕沟流域平面分布图

Figure 1. The plane distribution map of Lepa gully

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图 2 山体前缘发育小型滑坡_{（镜像南东）①}

Figure 2. Small landslide developed in the mountain front

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图 3 沟口局部卵砾石堆积体_{（镜像北东）}

Figure 3. Gravel accumulations in part of the estuary

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图 4 彝海地区近十年平均降雨量分布图

Figure 4. Average rainfall distribution map of the last ten years in Yihai district

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图 5 彝海地区2011年6月份日降雨量

Figure 5. Everyday rainfall distribution map of Yihai district in June, 2011

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图 6 2011年6月16—17日小时降雨量

Figure 6. Hour rainfall histogram between June 16^th and 17^th, 2011

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表 1 泥石流糙率系数的确定^[11]

Table 1. Roughness coefficients of debris flows

泥石流类型	河槽特点	比降	不同水深/m下的n值
泥石流类型	河槽特点	比降	0.5	1.0	2.0	4.0
稀性泥石流	河槽窄而陡，多跌坎与卡口，堵塞严重，河床由直径0.5~2.0 m的巨石组成	0.15~0.22	0.200	0.250	0.330	0.500
	河槽多弯道和跌坎，河床由粒径0.3~0.5 m的漂石组成	0.08~0.15	0.100	0.125	0.167	0.250
	河槽宽平顺直，河槽由小于0.3 m的碎石和沙砾组成	0.02~0.08	0.058	0.071	0.100	0.125
粘性泥石流	河槽陡窄弯曲，河床由巨石沙砾组成，多形成巨石堵塞及跌坎	0.12~0.16	0.056	0.067	0.083	0.100
	河槽较为顺直，河床由漂石及沙砾组成	0.08~0.12	0.036	0.042	0.050	0.060
	河槽宽平顺直，河床由一般小于0.3 m的碎石沙砾组成	0.04~0.08	0.029	0.036	0.042	0.050

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表 2 勒帕沟中游泥石流运动特征计算

Table 2. Calculations for the characteristics of the debris flow movements in the middle reaches of the Lepa gully

地点	ρ_c/(t·m^-3)	I_C/‰	R_C/m	V_C/(m·s^-1)	H/m	W/m	Q_C/(m³·s^-1)
勒帕沟中游	1.393	120	0.448	2.03	0.45	219.2	200.11

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