POSSIBLE SEISMIC CONTROL ON RIVER CHANNEL CHANGE IN THE LONGMENSHAN MOUNTAIN

LI Jian-feng; LIU Feng; WU Zhong-hai

2016 Vol. 22, No. 3

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LI Jian-feng, LIU Feng, WU Zhong-hai. POSSIBLE SEISMIC CONTROL ON RIVER CHANNEL CHANGE IN THE LONGMENSHAN MOUNTAIN[J]. Journal of Geomechanics, 2016, 22(3): 659-666.

Citation:

LI Jian-feng, LIU Feng, WU Zhong-hai. POSSIBLE SEISMIC CONTROL ON RIVER CHANNEL CHANGE IN THE LONGMENSHAN MOUNTAIN[J]. Journal of Geomechanics, 2016, 22(3): 659-666.

POSSIBLE SEISMIC CONTROL ON RIVER CHANNEL CHANGE IN THE LONGMENSHAN MOUNTAIN

Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

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Corresponding author: LIU Feng, tcytgr2005@outlook.com

Received Date: 21 April 2016

Publish Date: 25 September 2016

Abstract

Abstract

The 2008 M_w7.9 Wenchuan earthquake induced a large quantity of landslides whose materials entered the river channels. In some channel reach the seismic surface ruptures caused the co-seismic knick points across the channel of the Longmenshan Mountain. The river morphology and hydrodynamic condition may be changed. The field investigations show that co-seismic knick points disappeared rapidly, and meander cut-off would potentially occur in the near future. This suggests that the temporal increase in sediment input will not reduce the long-term fluvial transport capacity. A few years later, the rivers will reach a new state of eroion-transport-deposition. It is concluded that the seismic erosion events (landslide) and local hydrometerological conditions (heavy rainfall and flash flood) exert significant controls on the river channel change in the Longmenshan Mountain.
- meander cutoff /
- knick point /
- river channel change /
- large earthquake /
- Longmenshan Mountain

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References

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