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A Comparative Assessment of Hydrological Models in the Upper Cauvery Catchment

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Relation http://oar.icrisat.org/11796/
https://doi.org/10.3390/w13020151
doi:10.3390/w13020151
 
Title A Comparative Assessment of Hydrological Models in the Upper Cauvery Catchment
 
Creator Horan, R
Gowri, R
Wable, P S
Baron, H
Keller, V D J
Garg, K K
Mujumdar, P P
Houghton-Carr, H
Rees, G
 
Subject Water Resources
Water Conservation
 
Description This paper presents a comparison of the predictive capability of three hydrological models,
and a mean ensemble of these models, in a heavily influenced catchment in Peninsular India:
GWAVA (Global Water AVailability Assessment) model, SWAT (Soil Water Assessment Tool) and
VIC (Variable Infiltration Capacity) model. The performance of the three models and their ensemble
were investigated in five sub-catchments in the upstream reaches of the Cauvery river catchment.
Model performances for monthly streamflow simulations from 1983–2005 were analysed using
Nash-Sutcliffe efficiency, Kling-Gupta efficiency and percent bias. The predictive capability for each
model was compared, and the ability to accurately represent key catchment hydrological processes
is discussed. This highlighted the importance of an accurate spatial representation of precipitation
for input into hydrological models, and that comprehensive reservoir functionality is paramount
to obtaining good results in this region. The performance of the mean ensemble was analysed to
determine whether the application of a multi-model ensemble approach can be useful in overcoming
the uncertainties associated with individual models. It was demonstrated that the ensemble mean
has a better predictive ability in catchments with reservoirs than the individual models, with Nash-
Sutcliffe values between 0.49 and 0.92. Therefore, utilising multiple models could be a suitable
methodology to offset uncertainty in input data and poor reservoir operation functionality within
individual models.
 
Publisher MDPI
 
Date 2021-01
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11796/1/water-13-00151.pdf
Horan, R and Gowri, R and Wable, P S and Baron, H and Keller, V D J and Garg, K K and Mujumdar, P P and Houghton-Carr, H and Rees, G (2021) A Comparative Assessment of Hydrological Models in the Upper Cauvery Catchment. Water (TSI), 13 (151). pp. 1-16. ISSN 2073-4441