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CRITICAL HYDROLOGIC CONDITIONS FOR OVERFLOW BURST OF MORAINE LAKE

文献类型：期刊论文

作者Jiang Zhong-xin1; Cui Peng2; Jiang Liang-wei3
刊名CHINESE GEOGRAPHICAL SCIENCE
出版日期2004-03-01
卷号14期号:1页码:39-47
关键词moraine lake terminal moraine bank overflow burst critical height of overflow head glacial landslide Guangxiecuo Lake
ISSN号1002-0063
通讯作者Jiang Zhong-xin
英文摘要Floodwater and debris flow caused by glacial lake burst is an important land process and a serious mountain disaster in glacial area of Xizang (Tibet) Autonomous Region, and the overflow burst is mainly caused by glacial landslide falling into moraine lake. On the premise that moraine lake is full, instantaneous burst in part of the lake bank happens, as flow velocity at burst mouth caused by overflow head is higher than threshold flow velocity of glacial till. Under some supposes, d(90) and d(10) of the glacial till in the hank were used as the threshold sizes of coarse and fine grains respectively. Thus, the formula of calculating threshold flow velocity of uniform sand was simplified, and threshold flow velocity of glacial till was calculated with the formula. Then, with synthesis formula calculating flow velocity of instantaneous part burst, flow velocity at overflow burst mouth was calculated, and calculation formula of critical height (H(0)) of overflow head was derived. Overflow head was caused by volume and surge of glacial landslide falling into moraine lake, calculation formulas of ascendant height (H(1)) of lake water surface and surge height (H(2)) on burst mouth caused by glacial landslide falling into moraine lake were derived. To sum up, critical hydrologic conditions of moraine lake burst with overflow form are: the burst is inevitable as H(1) > H(0); the burst is possible as H(1) < H(0) and (H(1)+H(2)) > H(0); the burst is impossible as (H(1)+H(2)) < H(0). In the factors influencing the burst critical conditions, it is advantageous for the burst that scale of the lake is 10(5)m(2) range; terminal glacial till is more fine and is even more uniform; the width of overflow mouth is even smaller than the length of the bank; the landslide has large scale and steep slip surface; and glacial end is close to the lake. With burst of Guangxiecuo Lake in Midui Valley of the Polongzangbu River in Xizang as an example, the burst critical conditions were tested.
WOS标题词Science & Technology ; Life Sciences & Biomedicine
类目[WOS]Environmental Sciences
研究领域[WOS]Environmental Sciences & Ecology
收录类别SCI
语种英语
WOS记录号WOS:000206559400007
源URL[http://ir.imde.ac.cn/handle/131551/10600]  
专题成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
作者单位1.2 Survey & Design Inst Minist Railway, Chengdu 610031, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
3.SW Jiaotong Univ, Chengdu 610031, Peoples R China
推荐引用方式
GB/T 7714		 Jiang Zhong-xin,Cui Peng,Jiang Liang-wei. CRITICAL HYDROLOGIC CONDITIONS FOR OVERFLOW BURST OF MORAINE LAKE[J]. CHINESE GEOGRAPHICAL SCIENCE,2004,14(1):39-47.
APA Jiang Zhong-xin,Cui Peng,&Jiang Liang-wei.(2004).CRITICAL HYDROLOGIC CONDITIONS FOR OVERFLOW BURST OF MORAINE LAKE.CHINESE GEOGRAPHICAL SCIENCE,14(1),39-47.
MLA Jiang Zhong-xin,et al."CRITICAL HYDROLOGIC CONDITIONS FOR OVERFLOW BURST OF MORAINE LAKE".CHINESE GEOGRAPHICAL SCIENCE 14.1(2004):39-47.

入库方式： OAI收割

来源：成都山地灾害与环境研究所

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