Abstract
Resource shortages are having an increasingly severe impact as global trends like rapid population growth, urbanization, economic development, and climate change unfold. Moreover, rising living standards across many regions are also affecting water and energy resources. This entails an urgent requirement to improve water resources management. An important improvement is to transfer water between the different uses of the reservoir system. A compromise between the needs of hydropower generation and the water supply can be negotiated for the reservoir system to reduce the severity of water shortages. The Be River basin in Vietnam was selected as a case study to investigate. The combination of the generalized water allocation simulation model (GWASIM) and the bounded optimization by quadratic approximation (BOBYQA) algorithm was applied to optimize hydropower generation in various water shortage scenarios. The results present optimized hydropower generation policies for cascade reservoirs that would significantly improve the present operating policy in terms of both the water supply and hydropower generation. Moreover, multiple scenarios will provide flexibility to the reservoir operator by giving the relationship between water and energy. Given water supply conditions, the operator will be able to choose among several optimal solutions to ensure greater water resource efficiency in the Be River basin.
Highlights
Historical records indicate that severe drought has occurred in almost all parts of Vietnam [1,2].Severe droughts have hit the Central Highlands, the South-Central coast of Vietnam, and the Dong NaiRiver basin and resulted in depleted reservoirs, crop failures, reduced groundwater, and interruptions to the water supply
This study focused on optimizing hydropower generation with water shortage constraints
Hydropower generation policies in seven scenarios were optimized compared against the present operating policy using three water shortage indices—Shortage Rate (SR), shortage index (SI), and deficit percent day (DPD)
Summary
Severe droughts have hit the Central Highlands, the South-Central coast of Vietnam, and the Dong Nai. River basin and resulted in depleted reservoirs, crop failures, reduced groundwater, and interruptions to the water supply. River basin and resulted in depleted reservoirs, crop failures, reduced groundwater, and interruptions to the water supply These impacts demonstrate the potential vulnerability of other regions to future droughts [3,4,5]. Mitigation of drought damage is one of the most concerning problems for water resources management in the Dong Nai River basin. Hydropower generation has been viewed as the primary purpose of the three upstream reservoirs since the beginning of their operation, the cascade reservoirs system in the Be River basin is increasingly expected to reduce the severity of water shortages. Water resources were reallocated from hydropower generation to water
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