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| Content Provider | Springer Nature Link |
|---|---|
| Author | Jiang, Zhong xin Cui, Peng Jiang, Liang wei |
| Copyright Year | 2004 |
| Abstract | 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 bank 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 $_{1}$ |
| Starting Page | 39 |
| Ending Page | 47 |
| Page Count | 9 |
| File Format | |
| ISSN | 10020063 |
| Journal | Chinese Geographical Science |
| Volume Number | 14 |
| Issue Number | 1 |
| e-ISSN | 1993064X |
| Language | English |
| Publisher | Science Press |
| Publisher Date | 2004-01-01 |
| Publisher Place | Beijing |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | moraine lake terminal moraine bank overflow burst critical height of overflow head glacial landslide Guangxiecuo Lake Geography (general) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Geography, Planning and Development |
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