基于逆序递推的水库分级分期旱限水位确定方法研究

Study on the method of determining the graded and staged drought limited water level of reservoir based on the reverse order recursive algorithm

开展水库旱限水位确定技术研究,对于科学指导水库抗旱调度具有重要的意义。因此本文在旱限水位内涵解析的基础上,提出一种水库分级分期旱限水位计算新方法,充分考虑不同的干旱等级、不同行业年内需水过程的差异,采用逆序递推算法得到水库分级分期旱限水位。以山西省张峰水库作为研究对象,计算得到汛期、枯水期、农业灌溉期的旱警水位分别为756.5 m,756.2 m,754.5 m,旱保水位分别为735.8 m,730.7 m,728.2 m。通过方法对比分析,发现新的计算方法能够对更多的行业、更长的时段进行供水改善,在指导水库抗旱调度,提升水利工程群干旱防御能力方面具有显著优势。

Determining the drought limited water level of reservoir is of great significance to scientifically guide the drought-relief operation of reservoir.In this study,based on the connotation of drought limited water level,a new method is proposed to calculate the graded and staged drought limited water level of a reservoir,which uses the reverse order recursive algorithm and fully considers the differences in the annual water demand process of different drought levels and different industries.To verify the feasibility and im⁃provement of this method,drought limited water level of Zhangfeng Reservoir in Shanxi Province was calcu⁃lated.In the flood season,dry season and agricultural irrigation season,the drought warning water levels are 756.5m,756.2m and 754.5m respectively,and the drought guaranteed water levels are 735.8m,730.7m and 728.2m respectively.It is found that the new method can improve water supply in more indus⁃tries and longer periods,which has significant advantages in guiding the drought-relief operation of reser⁃voirs and enhancing the drought defense ability of water projects.