Author(s): Yunxiao Jia; Wu Zhou; Youcai Tuo; Jia Li; Haoyu Wang; Yongao Lu; Yanjing Yang

Linked Author(s):

Keywords: Thermal regime; Discharge water temperature; Stoplog operation; Hydrodynamic mathematical model; Operation management

Abstract: Selective water withdrawal facility is an effective strategy for balancing economic objectives and environmental needs of reservoirs. Multi-level intake operation is one of the main options for water temperature improvement measures in large and deep reservoirs. This study investigates the effects of different operation schemes of stoplog gate on thermal regime, hydrodynamic characteristics and discharged water temperature in reservoir combined with prototype observation and mathematical model. Based on the ecological target water temperature demand, the implementation of water temperature ecological scheduling is optimized. The result demonstrates that the operation of stoplog gate significantly changes the hydraulic and thermal characteristics near the dam area (P < 0.01), in which the position of the water intake layer rises by 10.0 m. Meanwhile, the surface temperature droppes by 1.1°C in June. The water temperature of the stoplog gate is significantly higher than that of the bottom outlet (P < 0.01), and the monthly average improvement effect is 0.7-1.8°C during the heating period. The optimization strategy of the operation scheduling scheme of the stoplog gate is discussed from the operation layer and the operation period. When the number of operation layers and the operation period are jointly optimized, the discharged water temperature can satisfy the ecological objective of target fish spawning and reproduction, and basically satisfy the demand of agricultural irrigation. This study has important guidance and reference significance for the adaptive management of water temperature ecological scheduling.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p0812-cd

Year: 2023