Integrated assessment of extreme events and hydrological responses of Indo-Nepal Gandak River Basin

Pawan K. Chaubey, Prashant K. Srivastava, Akhilesh Gupta and R. K. Mall ()
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Pawan K. Chaubey: Banaras Hindu University
Prashant K. Srivastava: Banaras Hindu University
Akhilesh Gupta: Department of Science and Technology
R. K. Mall: Banaras Hindu University

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2021, vol. 23, issue 6, No 30, 8643-8668

Abstract: Abstract Changes in climate cause significant alterations in morphometric parameters and may lead to hydro-meteorological hazards. In this study, an attempt has been made to identify drainage morphometric characteristics through topographic, geologic and hydrological information to assess the extreme weather events (flood) over the Gandak River Basin (GRB). The standardized precipitation index (SPI) and rainfall anomaly index (RAI) were used for deducing extreme rainfall incidences derived from the Tropical Rainfall Measuring Mission precipitation datasets. An assembled frequency distribution as well as trends in RAI and SPI was calculated to understand the hydro-climatological behaviour of the basin. During the monsoon season, the years 1998, 2007, 2011, 2013 and 2017 witnessed the extreme flood events. The variations in heavy and intense rainfall in short time can be linked to extreme flood events, which leads to channel shifting and modifications, can be deduced from provided asymmetric factors and sinuosity index. The results illustrated that both the monsoonal rainfall and the frequency of extreme rainfall over the basin are increasing, which could be a reason for a high severity and frequency of flood events in the GRB.

Keywords: Flood; Standardized precipitation index (SPI); Rainfall anomaly index (RAI); Morphometric; Gandak basin (Indo-Nepal region) (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s10668-020-00986-6

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