Modelling of environmental flow requirements using hydraulic and habitation models

Anthropogenic activities in the Krishna River have altered its flow regime and affected the ecosystems in the river. It is essential to maintain an optimum Environmental Flow (EF) in the river to recover from its deteriorated ecosystem. The present study is to estimate Environment Flow Requirement (...

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Autores principales:	A Uday Kumar, K.V. Jayakumar
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Environmental Flow Requirements (EFR) Global Environmental Flow Calculator (GEFC) Hydrological alteration Hydraulic analysis Krishna river Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/501ae32f530f4935aaa0d61dd7413f12
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spelling	oai:doaj.org-article:501ae32f530f4935aaa0d61dd7413f122021-12-01T04:33:23ZModelling of environmental flow requirements using hydraulic and habitation models1470-160X10.1016/j.ecolind.2020.107046https://doaj.org/article/501ae32f530f4935aaa0d61dd7413f122021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20309857https://doaj.org/toc/1470-160XAnthropogenic activities in the Krishna River have altered its flow regime and affected the ecosystems in the river. It is essential to maintain an optimum Environmental Flow (EF) in the river to recover from its deteriorated ecosystem. The present study is to estimate Environment Flow Requirement (EFRs) and the Hydrological Alteration (HA) (Flow changes) that take place on the Krishna River at five dam sites. Pre and post construction impact flow data are collected at five gauge stations which are located downstream of these five dams. The flow data which are impacted by climate variability are removed and the study is focussed on the impact of human activities. These EFRs are estimated using statistical relationships between the Krishna River flow regime and ecological indicator with the help of the Global Environmental Flow Calculator (GEFC). HA is used to analyse how the recommended EFRs are different in the post-impact period (after the dam construction). Hydraulic indicators like water depth and velocity are determined by importing estimated EF values into a Hydrologic Engineering Centre’s - River Analysis System (HEC-RAS) model. The habitation analysis is carried out to check whether the hydraulic indicators are providing an acceptable habitation for aquatic species in the study area. The results from HA analysis showed that the required EFRs in the Krishna River were not maintained for almost 43% of the time in the post impact period. The hydraulic analysis showed that recommended EFR is providing velocity in the range of 0.12 m/s to 1.08 m/s and water depth in the range of 0.23 m to 3.16 m throughout the basin. From the habitation study, it is observed that the results obtained from the GEFC approach is providing excellent habitation under the dams of Srisailam and Nagarjuna Sagar. Good habitation conditions are seen under Narayanapur, Ujjani, and PD Jurala dams.A Uday KumarK.V. JayakumarElsevierarticleEnvironmental Flow Requirements (EFR)Global Environmental Flow Calculator (GEFC)Hydrological alterationHydraulic analysisKrishna riverEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107046- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental Flow Requirements (EFR) Global Environmental Flow Calculator (GEFC) Hydrological alteration Hydraulic analysis Krishna river Ecology QH540-549.5
spellingShingle	Environmental Flow Requirements (EFR) Global Environmental Flow Calculator (GEFC) Hydrological alteration Hydraulic analysis Krishna river Ecology QH540-549.5 A Uday Kumar K.V. Jayakumar Modelling of environmental flow requirements using hydraulic and habitation models
description	Anthropogenic activities in the Krishna River have altered its flow regime and affected the ecosystems in the river. It is essential to maintain an optimum Environmental Flow (EF) in the river to recover from its deteriorated ecosystem. The present study is to estimate Environment Flow Requirement (EFRs) and the Hydrological Alteration (HA) (Flow changes) that take place on the Krishna River at five dam sites. Pre and post construction impact flow data are collected at five gauge stations which are located downstream of these five dams. The flow data which are impacted by climate variability are removed and the study is focussed on the impact of human activities. These EFRs are estimated using statistical relationships between the Krishna River flow regime and ecological indicator with the help of the Global Environmental Flow Calculator (GEFC). HA is used to analyse how the recommended EFRs are different in the post-impact period (after the dam construction). Hydraulic indicators like water depth and velocity are determined by importing estimated EF values into a Hydrologic Engineering Centre’s - River Analysis System (HEC-RAS) model. The habitation analysis is carried out to check whether the hydraulic indicators are providing an acceptable habitation for aquatic species in the study area. The results from HA analysis showed that the required EFRs in the Krishna River were not maintained for almost 43% of the time in the post impact period. The hydraulic analysis showed that recommended EFR is providing velocity in the range of 0.12 m/s to 1.08 m/s and water depth in the range of 0.23 m to 3.16 m throughout the basin. From the habitation study, it is observed that the results obtained from the GEFC approach is providing excellent habitation under the dams of Srisailam and Nagarjuna Sagar. Good habitation conditions are seen under Narayanapur, Ujjani, and PD Jurala dams.
format	article
author	A Uday Kumar K.V. Jayakumar
author_facet	A Uday Kumar K.V. Jayakumar
author_sort	A Uday Kumar
title	Modelling of environmental flow requirements using hydraulic and habitation models
title_short	Modelling of environmental flow requirements using hydraulic and habitation models
title_full	Modelling of environmental flow requirements using hydraulic and habitation models
title_fullStr	Modelling of environmental flow requirements using hydraulic and habitation models
title_full_unstemmed	Modelling of environmental flow requirements using hydraulic and habitation models
title_sort	modelling of environmental flow requirements using hydraulic and habitation models
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/501ae32f530f4935aaa0d61dd7413f12
work_keys_str_mv	AT audaykumar modellingofenvironmentalflowrequirementsusinghydraulicandhabitationmodels AT kvjayakumar modellingofenvironmentalflowrequirementsusinghydraulicandhabitationmodels
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Modelling of environmental flow requirements using hydraulic and habitation models

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