Effect of Hedging-Integrated Rule Curves on the Performance of the Pong Reservoir (India) During Scenario-Neutral Climate Change Perturbations

• Published in: Water resources management Vol. 30; no. 2; pp. 445 - 470
• Main Authors: Adeloye, A. J, Soundharajan, B.-S, Ojha, C. S. P, Remesan, R
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-01-2016; Springer Nature B.V
• Subjects: Algorithms; Atmospheric Sciences; Civil Engineering; Climate; Climate change; Computer simulation; Earth and Environmental Science; Earth Sciences; Environment; Genetic algorithms; Geotechnical Engineering & Applied Earth Sciences; Hedging; Hydrogeology; hydrologic models; Hydrology; Hydrology/Water Resources; International; Irrigation; Perturbation methods; rain; Rainfall; Rainfall-runoff relationships; Reservoirs; rivers; Runoff; Studies; Sustainability; temperature; Water resources management; Water shortages; India; India, Himachal Pradesh; India, Beas R; Climate change; Hedging; Reservoir operation; Reservoir performance evaluation; Rule curves; Genetic algorithms
• ISSN: 0920-4741; 1573-1650
• DOI: 10.1007/s11269-015-1171-z

This study has evaluated the effects of improved, hedging-integrated reservoir rule curves on the current and climate-change-perturbed future performances of the Pong reservoir, India. The Pong reservoir was formed by impounding the snow- and glacial-dominated Beas River in Himachal Pradesh. Simulated historic and climate-change runoff series by the HYSIM rainfall-runoff model formed the basis of the analysis. The climate perturbations used delta changes in temperature (from 0° to +2 °C) and rainfall (from −10 to +10 % of annual rainfall). Reservoir simulations were then carried out, forced with the simulated runoff scenarios, guided by rule curves derived by a coupled sequent peak algorithm and genetic algorithms optimiser. Reservoir performance was summarised in terms of reliability, resilience, vulnerability and sustainability. The results show that the historic vulnerability reduced from 61 % (no hedging) to 20 % (with hedging), i.e., better than the 25 % vulnerability often assumed tolerable for most water consumers. Climate change perturbations in the rainfall produced the expected outcomes for the runoff, with higher rainfall resulting in more runoff inflow and vice-versa. Reduced runoff caused the vulnerability to worsen to 66 % without hedging; this was improved to 26 % with hedging. The fact that improved operational practices involving hedging can effectively eliminate the impacts of water shortage caused by climate change is a significant outcome of this study.