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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology

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Proc. IAHS, 379, 21-29, 2018
https://doi.org/10.5194/piahs-379-21-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Pre-conference publication
05 Jun 2018
Effect of reservoir zones and hedging factor dynamism on reservoir adaptive capacity for climate change impacts
Adebayo J. Adeloye1 and Bankaru-Swamy Soundharajan2 1Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh EH14 4AS, UK
2Department of Civil Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India
Abstract. When based on the zones of available water in storage, hedging has traditionally used a single hedged zone and a constant rationing ratio for constraining supply during droughts. Given the usual seasonality of reservoir inflows, it is also possible that hedging could feature multiple hedged zones and temporally varying rationing ratios but very few studies addressing this have been reported especially in relation to adaptation to projected climate change. This study developed and tested Genetic Algorithms (GA) optimised zone-based operating policies of various configurations using data for the Pong reservoir, Himachal Pradesh, India. The results show that hedging does lessen vulnerability, which dropped from  ≥  60 % without hedging to below 25 % with the single stage hedging. More complex hedging policies, e.g. two stage and/or temporally varying rationing ratios only produced marginal improvements in performance. All this shows that water hedging policies do not have to be overly complex to effectively offset reservoir vulnerability caused by water shortage resulting from e.g. projected climate change.
Citation: Adeloye, A. J. and Soundharajan, B.-S.: Effect of reservoir zones and hedging factor dynamism on reservoir adaptive capacity for climate change impacts, Proc. IAHS, 379, 21-29, https://doi.org/10.5194/piahs-379-21-2018, 2018.
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We assessed the effects of different modes of operating reservoir on its ability to moderate water shortage impacts caused by climate change. The operating rule approach was enhanced by hedging using multiple zones and monthly rationing ratios for curtailment of water release. The results showed that basic hedging with single zone and constant rationing ratio caused significant reduction in water shortage during severe droughts. More complex operation modes produced only modest improvement.
We assessed the effects of different modes of operating reservoir on its ability to moderate...
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