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.
|Number of pages||9|
|Journal||Proceedings of the International Association of Hydrological Sciences|
|Publication status||Published - 5 Jun 2018|
|Event||8th International Symposium on Integrated Water Resources Management 2018 - Beijing, China|
Duration: 13 Jun 2018 → 15 Jun 2018
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)