Abstract
Abstract An optimal flood-limiting water level (FLWL) is needed to solve the contradiction between flood control safety measures and utilizable benefits. Therefore, this paper took the Chengbi River reservoir as an example, applied the Monte Carlo stochastic simulation and water consumption rate per unit of electrical energy methods to calculate the flood control risks and benefits associated with raising the FLWL in stages, and used the fuzzy comprehensive evaluation method to select the optimal FLWL for each stage of the flood season, which provided a scientific basis for the effective use of rainfall and flood data in the reservoir. The major outcomes of the study are as follows. (1) The reservoir flood season can be divided into a preflood season (April to May), a main flood season (June to August), and a later flood season (September to October). (2) The flood risks and power generation benefits of the reservoir are calculated after raising the FLWL, the optimal FLWL for the main flood season is 185.5 m, and the optimal FLWL for the later flood season is 187.50 m, while the FLWL in the preflood season should be kept at 185.0 m. The above results can provide scientific support for flood control safety planning and the optimal operation of reservoirs.
Highlights
With continuous economic development and the increasingly harsh global climate, the conflict between the supply and demand of water resources is becoming increasingly prominent
(2) The flood risks and power generation benefits of the reservoir are calculated after raising the flood-limiting water level (FLWL), the optimal FLWL for the main flood season is 185.5 m, and the optimal FLWL for the later flood season is 187.50 m, while the FLWL in the preflood season should be kept at 185.0 m
The results of using the water consumption rate per unit of electrical energy formula (5) to calculate the value-added power generation benefit (Eadd) of each stage of the Chengbi River reservoir after implementing staged operations are shown in Table 8 and Figure 4
Summary
With continuous economic development and the increasingly harsh global climate, the conflict between the supply and demand of water resources is becoming increasingly prominent. Multipurpose reservoirs, as important water conservancy structures, are helpful for flood control and can. The floodlimiting water level (FLWL) of the reservoir represents the combination of reservoir flood control and profitability and is the highest level of water allowed to be stored in a reservoir during the flood season; it acts as the starting level for flood control and dispatch. The reservoir flood-limiting water level (FLWL), which is the highest water level that allows storage during the flood season and the starting. A reasonable FLWL setting can make full use of rain and flood resources and effectively alleviate the contradiction between reservoir flood controls and potential benefits
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