Abstract
Abstract The present study proposes a novel framework to optimize the reservoir operation through linking mesohabitat hydraulic modeling and metaheuristic optimization to mitigate environmental impact downstream of the reservoir. Environmental impact function was developed by mesohabitat hydraulic simulation. Then, the developed function was utilized in the structure of the reservoir operation optimization. Different metaheuristic algorithms including practice swarm optimization, invasive weed optimization, differential evolution and biogeography-based algorithm were used to optimize reservoir operation. Root mean square error (RMSE) and reliability index were utilized to measure the performance of algorithms. Based on the results in the case study, the proposed method is robust for mitigating downstream environmental impacts and sustaining water supply by the reservoir. RMSE for mesohabitats is 8%, which indicates the robustness of proposed method to mitigate environmental impacts at downstream. It seems that providing environmental requirements might reduce the reliability of water supply considerably. Differential evolution algorithm is the best method to optimize reservoir operation in the case study.
Highlights
The importance of reservoirs in the development has been highlighted in the literature
An applicable form of the loss function has been utilized in many recent studies regarding the reservoir operation optimization (e.g Karami et al 2019)
riffle areas to pool areas (R/P) in the natural flow could be defined as the NPR and R/P in the optimal release could be considered as the OPR in each time step
Summary
The importance of reservoirs in the development has been highlighted in the literature. The present study proposes and evaluates a novel framework to mitigate environmental impact of the reservoirs at downstream river habitats by a linked mesohabitat modeling- optimization method. Run and riffle area might reduce habitat suitability at downstream river reach due to specific role of each mesohabitat unit for the biological activities of the aquatics such as fish. One of the effective methods for mitigating downstream environmental impact of reservoirs could be minimization of difference between area of mesohabitat units in the natural status and the optimal status. Using mesohabitat modeling method is generally able to maximize habitat suitability for all the species It would be one of the proper methods to mitigate downstream environmental impacts of reservoirs
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