NDLI: Hazard assessment of the formation and failure of the Sunkoshi landslide dam in Nepal

Content Provider	Springer Nature Link
Author	Shrestha, Badri Bhakta Nakagawa, Hajime
Copyright Year	2016
Abstract	A massive landslide occurred at Jure village of Nepal on August 2, 2014. The landslide mass blocked the Sunkoshi River and created a landslide dam. Thirty-seven days after the formation, the Sunkoshi landslide dam breached on September 7, 2014. In this study, flood hazards due to the formation and failure of the Sunkoshi landslide dam were analyzed. Flood inundation due to impounded water in the upstream river valley of the dam was also analyzed. The outburst discharge from the dam breach on September 7, 2014 and flood characteristics along the downstream river valley were computed by using an erosion-based dam breach and flow model. Flood inundation maps were prepared by using the results obtained from the numerical simulations and geographical information system tools. The peak flow discharge of the Sunkoshi landslide dam outburst at the dam outlet was found to be 6436 m$^{3}$/s, and the estimated time of the dam breach was found to be about 26 min. The estimated volume of water released from the impounded water in the upstream river valley of the dam was approximately 4.5 million m$^{3}$. The calculated peak flow velocity and maximum flow depth along the river ranged mostly from 3 to 11 m/s and from 4 to 10 m, respectively. The dam breach had considerable impact on areas more than 30 km downstream from the dam.
Starting Page	2029
Ending Page	2049
Page Count	21
File Format	PDF
ISSN	0921030X
Journal	Natural Hazards
Volume Number	82
Issue Number	3
e-ISSN	15730840
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-03-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sunkoshi landslide dam Dam breach Outburst flood Hazard assessment Numerical model Nepal Natural Hazards Hydrogeology Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Civil Engineering Environmental Management
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Water Science and Technology

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