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Causes and Consequences of Rishiganga Flash Flood, Nanda Devi Biosphere Reserve, Central Himalaya, India


Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, India
 

On 7 February 2021 at 10:30 am, a huge amount of slurry material flooded the Rishiganga catchment, resulting in excessive flow along the valley. The main cause of this flood was the dislocation of a huge rock mass approximately 540 m wide and 720 m long from the main rock body, which slipped down towards the Raunthi Gadera valley floor, causing massive devastation in the areas such as Raini, Tapovan, and Vishnuprayag. This event was not expected and was the first event in history when a flash flood occurred in winter. In this study, we tried to answer two major questions which are not been explained so far that are related to this disaster. These questions are (i) why did this event occur in winters? (ii) where did so much debris and water come from?. This study clearly answers these questions based on field observations

Keywords

Flash Flood, Himalaya, Nanda Devi, Raunthi Gadera, Rishiganga.
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  • Mehta, M., Shukla, T., Bhambri, R., Gupta, A. K. and Dobhal, D.

  • P., Terrain changes, caused by the 15–17 June 2013 heavy rainfall in the Garhwal Himalaya, India: a case study of Alaknanda and Mandakini basins. Geomorphology, 2017, 284, 53–71.

  • Valdiya, K. S., Paul, S. K., Tara, C., Bhakuni, S. S. and Upadhyay, R. C., Tectonic and lithological characterization of Himadri (Great Himalaya) between Kali and Yamuna rivers, Central Himalaya. Himalayan Geol., 1999, 20, 1–17.

  • Dobhal, D. P., Gupta, A. K., Mehta, M. and Khandelwal, D. D., Kedarnath disaster: facts and plausible causes. Curr. Sci., 2013, 105(2), 171–174.

  • Stocker, T. F. et al. (eds), Climate Change: The Physical Science Basis, Cambridge University Press, 2013, p. 1535.

  • https://economictimes.indiatimes.com/news/india/uttarakhand-disasterdeath-toll-rises-to-77with-recovery-of-one-more-body-inrainivillage/articleshow/81673664.cms (accessed on 24 March 2021).

  • Kumar, V., Shukla, T., Mehta, M., Dobhal, D. P., Bisht, M. P. S. and Nautiyal, S., Glacier changes and associated climate drivers for the last three decades, Nanda Devi region, Central Himalaya, India. Quaternary Int., 2021, 575–576, 213–226.

  • Maruo, Y., Geology and metamorphism of the Nanda Devi region, Kumaun Higher Himalaya. Himalayan Geol., 1979, 9, 1–17.

  • https://ms-my.facebook.com/NPIglaciology/posts/1449028428604128 (accessed on 2020).

  • Harris, I., Osborn, T. J., Jones, P. and Lister, D., Version 4 of the CRU TS monthly high-resolution gridded multivariate climate dataset. Sci. Data, 2020, 7(109), 1–18; doi:10.1038/s41597-020-0453-3.

  • Sinha, A. K., Geology of the Higher Central Himalaya, John Wiley, Chichester, UK, 1989, p. 236.

  • Sain, K. et al., A perspective on Rishiganga–Dhauliganga flash flood in the Nanda Devi Biosphere Reserve, Garhwal Himalaya, India. J. Geol. Soc. India, 2021, 97, 335–338.

  • Shugar, D. H. et al., A massive rock and ice avalanche caused the 2021 disaster at Chamoli, Indian Himalaya. Science, 2021, 373, 300–306.

  • Agarwal, A. and Chak, A. (eds), Floods, Flood Plains and Environmental Myths, State of India Environments: A Citizen’s Report, Centre for Science and Environment, 1991, vol. 3, p. 167.

  • Wasson, R. J., Sundriyal, Y. P., Chaudhary, S., Jaiswal, M. K., Morthekai, P., Sati, S. P. and Juyal, N., A 1000-year history of large floods in the Upper Ganga catchment, central Himalaya, India. Quaternary Sci. Rev., 2013, 77, 156–166.

  • https://www.nationalheraldindia.com/india/uttarakhand-disaster-55bodies-recovered-so-far-179-missing-person-reports-lodged (accessed on 15 February 2021).

  • https://timesofindia.indiatimes.com/india/uttarakhand-glacier-burstinchamoli-damages-hydropower-plant-rescue-operations-underway/ articleshow/80732809.cms (accessed on 7 February 2021).


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  • Causes and Consequences of Rishiganga Flash Flood, Nanda Devi Biosphere Reserve, Central Himalaya, India

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Authors

Manish Mehta
Wadia Institute of Himalayan Geology, Dehradun 248 001, India
Vinit Kumar
Wadia Institute of Himalayan Geology, Dehradun 248 001, India
Kalachand Sain
Wadia Institute of Himalayan Geology, Dehradun 248 001, India
Sameer K. Tiwari
Wadia Institute of Himalayan Geology, Dehradun 248 001, India
Amit Kumar
Wadia Institute of Himalayan Geology, Dehradun 248 001, India
Akshaya Verma
Wadia Institute of Himalayan Geology, Dehradun 248 001, India

Abstract


On 7 February 2021 at 10:30 am, a huge amount of slurry material flooded the Rishiganga catchment, resulting in excessive flow along the valley. The main cause of this flood was the dislocation of a huge rock mass approximately 540 m wide and 720 m long from the main rock body, which slipped down towards the Raunthi Gadera valley floor, causing massive devastation in the areas such as Raini, Tapovan, and Vishnuprayag. This event was not expected and was the first event in history when a flash flood occurred in winter. In this study, we tried to answer two major questions which are not been explained so far that are related to this disaster. These questions are (i) why did this event occur in winters? (ii) where did so much debris and water come from?. This study clearly answers these questions based on field observations

Keywords


Flash Flood, Himalaya, Nanda Devi, Raunthi Gadera, Rishiganga.

References





DOI: https://doi.org/10.18520/cs%2Fv121%2Fi11%2F1483-1487