Glacial hazards in the Rolwaling valley of Nepal and numerical approach to predict potential outburst flood from glacial lake

Shrestha, Badri Bhakta; Nakagawa, Hajime; Kawaike, Kenji; Baba, Yasuyuki; Zhang, H.

doi:10.1007/s10346-012-0327-7

Cited by 18 publications

(18 citation statements)

References 16 publications

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“…Several breaching scenarios were simulated, and eroded sediments were not considered in the model. Shrestha et al (2013) modeled a potential debris-flow GLOF originating at Tsho Rolpa in the Rolwaling Valley of Nepal including the moraine breaching process due to an assumed seepage failure. Laboratory experiments were conducted to verify the model and good agreement with model results were obtained.…”

Section: Comparison To Previous Imja Tsho Glof Modelingmentioning

confidence: 99%

Assessing downstream flood impacts due to a potential GLOF from Imja Tsho in Nepal

Somos‐Valenzuela

McKinney

Byers

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Glacial-dominated areas pose unique challenges to downstream communities in adapting to recent and continuing global climate change, including increased threats of glacial lake outburst floods (GLOFs) that can increase risk due to flooding of downstream communities and cause substantial impacts on regional social, environmental and economic systems. The Imja glacial lake (or Imja Tsho) in Nepal, which has the potential to generate a GLOF, was studied using a two-dimensional debris-flow inundation model in order to evaluate the effectiveness of proposed measures to reduce possible flooding impacts to downstream communities by lowering the lake level. The results indicate that only minor flood impact reduction is achieved in the downstream community of Dingboche with modest ( ∼ 3 m) lake lowering. Lowering the lake by 10 m shows a significant reduction in inundated area. However, lowering the lake by 20 m almost eliminates all flood impact at Dingboche. Further downstream at Phakding, the impact of the GLOF is significant and similar reductions in inundation are likely as a result of lake lowering.

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Section: Comparison To Previous Imja Tsho Glof Modelingmentioning

confidence: 99%

Assessing downstream flood impacts due to a potential GLOF from Imja Tsho in Nepal

Somos‐Valenzuela

McKinney

Byers

et al. 2015

Hydrol. Earth Syst. Sci.

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“…The potential outburst floods/debris flows from the Imja glacial lake were analyzed using our numerical model of the flow and moraine dam failure [Shrestha et al, 2013;Shrestha and Nakagawa, 2014]. Detailed descriptions of used numerical model are presented below.…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

“…Figure 5 shows the details of moraine dams used in the experiments. The detail explanation of flume experiments can be found in Shrestha et al [2013].…”

Section: Model Verificationmentioning

confidence: 99%

“…The moraine dams are comparatively weak and can breach suddenly, leading to the sudden discharge of huge volumes of water and debris [Bajracharya et al, 2006]. The GLOF events can cause catastrophic flooding in downstream areas, with serious damage to life, property, forests, agricultural areas, and infrastructures [Bajracharya et al, 2006[Bajracharya et al, , 2007aWang et al, 2008;Shrestha et al, 2013;Shrestha and Nakagawa, 2014]. It is thus necessary to investigate the outburst of glacial lakes and its downstream impacts in order to avoid or minimize loss of life and property.…”

Section: Introductionmentioning

confidence: 99%

“…However, some attempts have been carried out on the impact of climate change on the Himalayan glaciers [Bajracharya et al, 2006;Bajracharya, 2010;Shrestha et al, 2010b] and on the characteristics of the GLOF events [Bajracharya et al, 2007a;Wang et al, 2008;Osti and Egashira, 2009;Shrestha et al, 2010a;Shrestha et al, 2013, Worni et al, 2012, Shrestha and Nakagawa, 2014. But, the failure mechanism and erosion process of moraine dam are still not thoroughly understood.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Debris-Flow and Flood Characteristics Caused by Potential Outburst of the Imja Glacial Lake in Nepal

Shrestha

Nakagawa

2016

IJECE

Self Cite

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Debris flows and floods caused by outburst of glacial lakes have frequently occurred in the Himalaya of South Asia. The frequency of these disasters has been increasing tremendously due to global climate change. It is thus necessary to investigate debris-flow and flood characteristics due to outburst of glacial lakes in order to manage the hazards and risk in the areas. In this study, the characteristics of debris flows and floods caused by potential outburst flood from the Imja glacial lake in Nepal due to moraine dam failure by water overtopping were analyzed using developed numerical model. The numerical model was validated with the flume experimental cases. The relationship between peak outburst discharges with the volumes of lake water for experimental conditions was also analyzed. The erosion and deposition processes along the river valley were also considered in the analyses of potential outburst floods from the Imja glacial lake. Sensitivity analyses of the parameters of river bed sediment were also conducted. The predicted results of debris-flow and flood characteristics such as outburst discharge, flood arrival time, sediment concentrations, peak flow velocity and maximum flow depth can be useful for effective preventive measures, river basin management and infrastructure planning in the river basin.

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Preface for the thematic issue “glacial lake outburst floods”

Vilímek

2016

Landslides

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Glacial hazards in the Rolwaling valley of Nepal and numerical approach to predict potential outburst flood from glacial lake

Cited by 18 publications

References 16 publications

Assessing downstream flood impacts due to a potential GLOF from Imja Tsho in Nepal

Assessing downstream flood impacts due to a potential GLOF from Imja Tsho in Nepal

Prediction of Debris-Flow and Flood Characteristics Caused by Potential Outburst of the Imja Glacial Lake in Nepal

Preface for the thematic issue “glacial lake outburst floods”

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