Abstract

By analyzing the formation causes of the mountain torrent disasters as well as the distribution characteristics of rainstorm in Longmen Mountain area, and citing the typical post-seismic the mountain torrent disasters within 2008~2013 after the Wenchuan earthquake in the area as example, the character of post-seismic floods, the spatial distribution of the devasting post-seismic debris flows, the critical rainfall to trigger the mountain torrent disasters and so on are explored. Besides, the sediment before and after the Wenchuan earthquake of the Minjiang watershed are compared. The conclusions are as following: (1) The time of the post-seismic flash floods and debris flows after the Wenchuan earthquake are centered from July to September, which is consistent with the rainfall of the area. (2) Rather than the debris flows are triggered when the rainfall intensity reached the critical rainfall intensity, those are closely linked with the pre-accumulated rainfall. That is to say, the more pre-accumulated rainfall, the more probability of the debris flows. (3) After the Wenchuan earthquake, the total sediment increases 13.8%~70%. But the increasing range is varied from year to year. In the year when the debris flow occurred, the sediment shall increase drastically.

Details

Title
The mountain torrent disasters and its effect on sediment transport after the Wenchuan earthquake
Author
Ding, H R 1 ; Y Li 2 ; Ni, S J 3 ; Shao, C J 2 ; Shi, Z M 3 ; Yan, L 2 ; Lv, L Q 2 ; T Ni 4 ; Gong, R H 4 ; Shi, L 4 ; Liu, Y X 4 

 School of Earth Science, Chengdu University of Technology, Chengdu, Sichuan Province, 610059, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology, Chengdu, Sichuan Province, 610059, China 
 School of Energy, Chengdu University of Technology, Chengdu, Sichuan Province, 610059, China 
 School of Earth Science, Chengdu University of Technology, Chengdu, Sichuan Province, 610059, China 
 College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan Province, 610059, China 
Publication year
2019
Publication date
Oct 2019
Publisher
IOP Publishing
ISSN
17551307
e-ISSN
17551315
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2558004094
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.