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Study on the threshold condition to suppress anoxic zone by large flow operation process

LIU Chang，LIU Xiaobo，ZHOU Huaidong，LI Budong，WANG Shiyan，WANG Liang
（China Institute of Water Resources and Hydropower Research，
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，Beijing 100038，China）

Abstract：The hypoxia in large reservoirs during the thermal stratification period will seriously affect its wa⁃
ter quality，threatening the water supply safety of the reservoir. The strong convection conditions caused by
the large flow discharge process can seriously weaken or even completely eliminate the hypoxia in the reser⁃
voir. Taking Daheiting reservoir as an example， the evolution process of anoxic area in Daheiting reservoir
is inversed by using a three-dimensional mathematical model. It is found that hypoxia occurs in about 2/3
area of Daheiting reservoir in August，the stable development period of the anoxic area. In order to reduce
the risk of water supply safety caused by hypoxia， through the analysis of each scenario， this paper gives
the hierarchical threshold conditions to suppress anoxic zone in Daheiting reservoir. The results show that
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when the average daily flow reaches 96.5m /s and the total dispatching time is 15~30 days， it is a good
threshold for the suppression of the anoxic zone of the Daheiting Reservoir. At this time，about 70%~90%
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of the anoxic zone will hopefully be suppressed. When the average daily flow rate reaches 115.7m /s and
the total scheduling time is 15~30 days，it is the perfect threshold. At this time，about 90%~100% of the
anoxic zone will be suppressed， and the hypoxia phenomenon in the reservoir area will be basically elimi⁃
nated.
Keywords：thermal stratification；anoxic zone；large flow operation process；threshold condition

（责任编辑：杨 虹）

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