Dam operation affects the evolution and propagation of hydrological extremes

Dey, P and Swarnkar, S and Mujumdar, P (2024) Dam operation affects the evolution and propagation of hydrological extremes. In: Hydrological Sciences Journal .

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Abstract

Dams are an integral component of water resources systems and management in the Upper Ganga basin. However, the impact of dam operations on the characteristics of hydrological extremes and their regional spatial pattern is less explored. Based on observational datasets, we studied the changes in the flood and drought characteristics at local and regional scales by comparing them during pre- and post-dam periods. It was observed that the annual frequency of streamflow is missing from the spectral representation of daily streamflow at the Tehri catchment during the post-dam period. The dam operation has reduced the flood peaks but increased their duration and volume, and the dam has influenced the variability in drought duration, intensity, and deficit. The operation of dams has changed the timing and strength of seasonality of these extremes. Ultimately, the dam has increased the risk of regional occurrences of droughts and minimized the risk of floods. © 2024 IAHS.

Item Type:	Journal Article
Publication:	Hydrological Sciences Journal
Publisher:	Taylor and Francis Ltd.
Additional Information:	The copyright for this article belongs to Taylor and Francis Ltd.
Keywords:	Catchments; Dams; Drought; Flood control; Stream flow; Water resources, Flood characteristics; Ganga basin; Hydrological extremes; Integral components; Seasonality; Spatial connectedness; Spatial patterns; Upper ganga basin; Water resources management; Water resources systems, Floods
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research Division of Mechanical Sciences > Civil Engineering
Date Deposited:	14 May 2024 11:31
Last Modified:	14 May 2024 11:31
URI:	https://eprints.iisc.ac.in/id/eprint/84458

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