Article (Scientific journals)
Evaluation of potential landslide damming: Case study of Urni landslide, Kinnaur, Satluj valley, India
Kumar, Vipin; Gupta, Vikram; Jamir, Imlirenla et al.
2019In Geoscience Frontiers, 10 (2), p. 753-767
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Keywords :
Landslides; Himalaya
Abstract :
[en] This work aims to understand the process of potential landslide damming using slope failure mechanism, dam dimension and dam stability evaluation. The Urni landslide, situated on the right bank of the Satluj River, Himachal Pradesh (India) is taken as the case study. The Urni landslide has evolved into a complex landslide in the last two decade (2000–2016) and has dammed the Satluj River partially since year 2013, damaging ∼200 m stretch of the National Highway (NH-05). The crown of the landslide exists at an altitude of ∼2180–2190 m above msl, close to the Urni village that has a human population of about 500. The high resolution imagery shows ∼ 50 m long landslide scarp and ∼ 100 m long transverse cracks in the detached mass that implies potential for further slope failure movement. Further analysis shows that the landslide has attained an areal increase of 103900 ± 1142 m2 during year 2004–2016. About 86% of this areal increase occurred since year 2013. Abrupt increase in the annual mean rainfall is also observed since the year 2013. The extreme rainfall in the June, 2013; 11 June (∼100 mm) and 16 June (∼115 mm), are considered to be responsible for the slope failure in the Urni landslide that has partially dammed the river. The finite element modelling (FEM) based slope stability analysis revealed the shear strain in the order of 0.0–0.16 with 0.0–0.6 m total displacement in the detachment zone. Further, kinematic analysis indicated planar and wedge failure condition in the jointed rockmass. The debris flow runout simulation of the detached mass in the landslide showed a velocity of ∼25 m/s with a flow height of ∼15 m while it (debris flow) reaches the valley floor.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Kumar, Vipin ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Gupta, Vikram
Jamir, Imlirenla
Chattoraj, S. L.
Language :
English
Title :
Evaluation of potential landslide damming: Case study of Urni landslide, Kinnaur, Satluj valley, India
Publication date :
2019
Journal title :
Geoscience Frontiers
ISSN :
1674-9871
Publisher :
Elsevier
Volume :
10
Issue :
2
Pages :
753-767
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2021

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