[1]杨敏,马东涛,陈英.冕宁县牦牛坪稀土矿区“ 7?18”水石流灾害[J].山地学报,2014,(06):732.
　YANG Min,MA Dongtao,CHEN Ying.An Approach about Water stone Flow Hazards Occurred in July 18th，2013 in Maoniuping Rare Earth Mining Area in Mianning，Sichuan[J].Mountain Research,2014,(06):732.
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冕宁县牦牛坪稀土矿区“ 7?18”水石流灾害()

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《山地学报》[ISSN:1008-2186/CN:51-1516]

Title:: An Approach about Water stone Flow Hazards Occurred in July 18th，2013 in Maoniuping Rare Earth Mining Area in Mianning，Sichuan

Author(s):: YANG Min; MA Dongtao; CHEN Ying; 1.Institute of Mountain Hazards and Environment，Chinese Academy of Sciences & Ministry of Water Conservancy，Chengdu 610041，China；
2.University of Chinese Academy of Science，Beijing 100039，China

Keywords:: waterstone flow; forming condition; characteristics; endangers; rare earth mining area

摘要:: 2013-07-17T20：00—2013-07-18T3：00，冕宁县牦牛坪稀土矿区7 h降雨219 mm，瓦维埃河及支沟发生6处水石流，对采矿场、选矿厂、地面站、弃土场、排洪沟、矿山公路及矿山环境造成严重危害。研究发现：牦牛坪矿区具备水石流发育的充分条件，泥石流沟处于发育壮年期，但泥石流处于衰退期。“7·18”水石流是在100 a一遇强暴雨激发下，沟床及岸坡老泥石流堆积物和沟床堆积物在山洪冲蚀下切、侧蚀下形成的，暴雨和水石流暴发频率同步。其水石流具有固体物质粗大（最大粒径8 m），块砾石含量高（80%以上），粉、粘粒含量极低（小于1%），容重高（16～185 t/m3），冲淤变化大（最大冲深10 m，最大淤积5 m），规模大（总冲出量50×104 m3）等特点。

Abstract:: Waterstone flow is a special type of debris flow，which usually breaks out in granite，limestone，marble area and in rare rainstorm. In July 18，2013，a heavy rainstorm with rainfall of 219 mm in 7 hours in Maoniuping rareearth mining area of Mianning County，Sichuan，China triggered 6 waterstone flow and 2 mining debris flow in Waweiai River Basin and its tributaries. The mining fields，ore dressing plant，ground station，dump，flood discharge trench，mining road et al and mine environment suffered serious harms. The study shows that the studied region has sufficient conditions for waterstone flow developing，and the debris flow is in the stage of maturity while the debris flow is in a recession. July 18 waterstone flows are induced by a strong rainfall with frequency of 100 years，which eroded and incised old debris flow bank and bed deposits along with flash flood. The frequency of heavy rain and outbreak of waterstone flow has same synchronization. The waterstone flow has some features such as coarse solids (maximum diameter of 8 m)，very low content of powder and clay (less than 1%)，high bulk density (1.6~1.85 t/m3)，strong scouring and silting changes in gully bed (maximum scour depth 10 meters，the largest deposition depth of 5 meters)，large scale (with total capacity of 50×104 m3 of solid materials ) etc.

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备注/Memo:: 收稿日期(Received date)：2013-12-17；修回日期（Accepted）：2014-01-07。
作者简介（Biography）：杨敏,（1987-），女，汉族，四川眉山人，在读硕士研究生，研究方向为山地灾害防治工程。\[Yang Min(1987-),female, major in mountain hazards prevention engineering.\]E-mail:15682027308@163.com *
通信作者(Corresponding author): 马东涛,（1965-），男，汉族，陕西武功人，博士，教授，主要从事地质灾害基础理论研究和防灾减灾工程实践。\[Ma Dongtao,(1965-), male, prof. & Dr. of Science, major in geo-hazards mitigation theory and engineering.\]E-mail: dtma@imde.ac.cn

更新日期/Last Update: 1900-01-01