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随着全球极端气候越发频繁、水资源时空分布更加不均,水资源供需矛盾日益加剧。为充分利用水库调控水资源能力和发挥工程效益,采用预蓄预泄法对燕山水库汛限水位进行动态控制方案研究,首先基于下游防洪安全,根据降雨与洪水预报信息,采取预蓄预泄方案确定汛限水位上限值;再基于大坝自身安全和水库超泄能力分析确定了主汛期与后汛期的最高汛限水位。与原汛限水位104.20 m相比,考虑洪水预报信息情况汛限水位可调整至104.77 m,考虑降雨预报信息时可调整至105.36 m。计算分析结果表明,调整后的动态汛限水位对大坝自身安全及下游防洪安全影响较小,提高了水资源可利用率,具有可实施性。
With the global extreme climate becoming more and more frequent, the space-time distribution of water resources is more uneven, and the contradiction between supply and demand of water resources is aggravating day by day. In order to make full use of the capacity of reservoirs to control water resources and to exert engineering benefits, the pre-discharge pre-vent method is used to study the dynamic control scheme of Yanshan Reservoir flood control water level. First, based on the information of rainfall and flood forecasting, Then determine the upper limit of flood control water level; and then determine the maximum flood control water level of main flood season and the later flood season based on the analysis of dam self-safety and reservoir over-flow capacity. Compared with the original 104.04 m flood control limit, the flood control water level can be adjusted to 104.77 m considering the flood forecast information and can be adjusted to 105.36 m considering the rainfall forecast information. The calculation and analysis results show that the adjusted dynamic flood limited water level has less impact on dam own safety and downstream flood control safety, and improves the availability of water resources, which is feasible.