Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors

Abstract Climate change and anthropogenic activities pose serious threats to river basin hydrology worldwide. The Ganga basin is home to around half a billion people and has been significantly impacted by hydrological alterations in the last few decades. The increasing high-intensity rainfall events...

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Autores principales:	Somil Swarnkar, Pradeep Mujumdar, Rajiv Sinha
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/69c7e5108b8c4440ab91a35a3b78c3fe
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spelling	oai:doaj.org-article:69c7e5108b8c4440ab91a35a3b78c3fe2021-12-02T17:18:20ZModified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors10.1038/s41598-021-98827-72045-2322https://doaj.org/article/69c7e5108b8c4440ab91a35a3b78c3fe2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98827-7https://doaj.org/toc/2045-2322Abstract Climate change and anthropogenic activities pose serious threats to river basin hydrology worldwide. The Ganga basin is home to around half a billion people and has been significantly impacted by hydrological alterations in the last few decades. The increasing high-intensity rainfall events often create flash flooding events. Such events are frequently reported in mountainous and alluvial plains of the Ganga basin, putting the entire basin under severe flood risk. Further, increasing human interventions through hydraulic structures in the upstream reaches significantly alter the flows during the pre-and post-monsoon periods. Here, we explore the hydrological implications of increasing reservoir-induced and climate-related stressors in the Upper Ganga Basin (UGB), India. Flow/sediment duration curves and flood frequency analysis have been used to assess pre-and post-1995 hydrological behaviour. Our results indicate that low and moderate flows have been significantly altered, and the flood peaks have been attenuated by the operation of hydraulic structures in the Bhagirathi (western subbasin). The Alaknanda (eastern subbasin) has experienced an increase in extreme rainfall and flows post-1995. The downstream reaches experience reservoir-induced moderate flow alterations during pre-and post-monsoon and increasing extreme flood magnitudes during monsoon. Furthermore, substantial siltation upstream of the reservoirs has disrupted the upstream–downstream geomorphologic linkages.Somil SwarnkarPradeep MujumdarRajiv SinhaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Somil Swarnkar Pradeep Mujumdar Rajiv Sinha Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
description	Abstract Climate change and anthropogenic activities pose serious threats to river basin hydrology worldwide. The Ganga basin is home to around half a billion people and has been significantly impacted by hydrological alterations in the last few decades. The increasing high-intensity rainfall events often create flash flooding events. Such events are frequently reported in mountainous and alluvial plains of the Ganga basin, putting the entire basin under severe flood risk. Further, increasing human interventions through hydraulic structures in the upstream reaches significantly alter the flows during the pre-and post-monsoon periods. Here, we explore the hydrological implications of increasing reservoir-induced and climate-related stressors in the Upper Ganga Basin (UGB), India. Flow/sediment duration curves and flood frequency analysis have been used to assess pre-and post-1995 hydrological behaviour. Our results indicate that low and moderate flows have been significantly altered, and the flood peaks have been attenuated by the operation of hydraulic structures in the Bhagirathi (western subbasin). The Alaknanda (eastern subbasin) has experienced an increase in extreme rainfall and flows post-1995. The downstream reaches experience reservoir-induced moderate flow alterations during pre-and post-monsoon and increasing extreme flood magnitudes during monsoon. Furthermore, substantial siltation upstream of the reservoirs has disrupted the upstream–downstream geomorphologic linkages.
format	article
author	Somil Swarnkar Pradeep Mujumdar Rajiv Sinha
author_facet	Somil Swarnkar Pradeep Mujumdar Rajiv Sinha
author_sort	Somil Swarnkar
title	Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
title_short	Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
title_full	Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
title_fullStr	Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
title_full_unstemmed	Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors
title_sort	modified hydrologic regime of upper ganga basin induced by natural and anthropogenic stressors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/69c7e5108b8c4440ab91a35a3b78c3fe
work_keys_str_mv	AT somilswarnkar modifiedhydrologicregimeofuppergangabasininducedbynaturalandanthropogenicstressors AT pradeepmujumdar modifiedhydrologicregimeofuppergangabasininducedbynaturalandanthropogenicstressors AT rajivsinha modifiedhydrologicregimeofuppergangabasininducedbynaturalandanthropogenicstressors
_version_	1718381149558931456

Modified hydrologic regime of upper Ganga basin induced by natural and anthropogenic stressors

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