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CRITICAL HYDROLOGIC CONDITIONS FOR OVERFLOW BURST OF MORAINE LAKE
Jiang Zhong-xin1; Cui Peng2; Jiang Liang-wei3
Corresponding AuthorJiang Zhong-xin
2004-03-01
Source PublicationCHINESE GEOGRAPHICAL SCIENCE
ISSN1002-0063
Volume14Issue:1Pages:39-47
SubtypeArticle
AbstractFloodwater 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.
KeywordMoraine Lake Terminal Moraine Bank Overflow Burst Critical Height Of Overflow Head Glacial Landslide Guangxiecuo Lake
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
Language英语
WOS SubjectEnvironmental Sciences
WOS IDWOS:000206559400007
Funding OrganizationChinese Academy of Sciences(KZCX2-306)
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/10600
Collection山地灾害与地表过程重点实验室
Affiliation1.2 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
Recommended Citation
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.
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