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A comprehensive assessment framework for attributing trends in streamflow and groundwater storage to climatic and anthropogenic changes: A case study in the typical semi‐arid catchments of southern India

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Relation http://oar.icrisat.org/11883/
https://doi.org/10.1002/hyp.14305
doi:10.1002/hyp.14305
 
Title A comprehensive assessment framework for attributing trends in streamflow and groundwater storage to climatic and anthropogenic changes: A case study in the typical semi‐arid catchments of southern India
 
Creator Nune, R
George, B A
Western, A W
Garg, K K
Dixit, S
Ragab, R
 
Subject Watershed Management
Climate Change
Water Resources
 
Description The clearest signs of hydrologic change can be observed from the trends in
streamflow and groundwater levels in a catchment. During 1980–2007, significant
declines in streamflow (-3.03 mm/year) and groundwater levels (-0.22 m/year)
were observed in Himayat Sagar (HS) catchment, India. We examined the degree to
which hydrologic changes observed in the HS catchment can be attributed to various
internal and external drivers of change (climatic and anthropogenic changes). This
study used an investigative approach to attribute hydrologic changes. First, it
involves to develop a model and test its ability to predict hydrologic trends in a catchment
that has undergone significant changes. Second, it examines the relative importance
of different causes of change on the hydrologic response. The analysis was
carried out using Modified Soil and Water Assessment Tool (SWAT), a semidistributed
rainfall-runoff model coupled with a lumped groundwater model for each
sub- catchment. The model results indicated that the decline in potential evapotranspiration
(PET) appears to be partially offset by a significant response to changes in
rainfall. Measures that enhance recharge, such as watershed hydrological structures,
have had limited success in terms of reducing impacts on the catchment-scale water
balance. Groundwater storage has declined at a rate of 5 mm/y due to impact of land
use changes and this was replaced by a net addition of 2 mm/y by hydrological structures.
The impact of land use change on streamflow is an order of magnitude larger
than the impact of hydrological structures and about is 2.5 times higher in terms of
groundwater impact. Model results indicate that both exogenous and endogenous
changes can have large impacts on catchment hydrology and should be considered
together. The proposed comprehensive framework and approach demonstrated here
is valuable in attributing trends in streamflow and groundwater levels to catchment
climatic and anthropogenic changes.
 
Publisher Wiley
 
Date 2021-06
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11883/1/NUNE%20ET%20Al%20-%20A%20comprehensive%20assessment%20framework%20for%20attributing%20trends%20in%20streamflow%20and%20groundwater%20storage%20to%20climatic%20and%20anthropogenic%20changes%20-%20A%20case%20study%20in%20.pdf
Nune, R and George, B A and Western, A W and Garg, K K and Dixit, S and Ragab, R (2021) A comprehensive assessment framework for attributing trends in streamflow and groundwater storage to climatic and anthropogenic changes: A case study in the typical semi‐arid catchments of southern India. Hydrological Processes (TSI), 35 (8). pp. 1-17. ISSN 0885-6087