WEI Ruishen, YAN Ziqi, ZHOU Zuhao, ZHENG Jinli, YAN Denghua, DING Wei

Abstract: 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 improvement of this method, drought limited water level of Zhangfeng Reservoir in Shanxi Province was calculated. 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 industries and longer periods, which has significant advantages in guiding the drought-relief operation of reservoirs and enhancing the drought defense ability of water projects.

Keywords: drought limited water level, graded and staged, reverse order recursive, drought-relief operation, Zhangfeng Reservoir, monthly sliding