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To mitigate possible negative impacts of cascade dams on spawning of rare and endemic fish species in the national nature reserve downstream of these dams, spawning flow velocity demand for fish need to be considered in the cascade dams operation. Based on the cascade dams constructed in the upper Yangtze River, Coreius Heterodon was selected as the representative fish species. According to the drifting distance of fish eggs, the flow velocity characteristics at the spawning location of Coreius Heterodon were analysed with the unsteady flow mathematical model. The results show that a large flow velocity increase process is good for Coreius Heterodon spawning, and the process of velocity fluctuation is similar before spawning. The cumulative velocity amplitude, the cumulative number of fluctuations and the maximum velocity amplitude are closely correlation with the spawning number. The velocity in spawning period is affected by the dams operation, and the suitable range of velocity is changed from [0.8m/s, 1.2m/s] to [1.1m/s, 1.4m/s]. The results can provide the basis for future ecological operation based on flow velocity index of the cascade dams.

Spawning flow velocity demand for representative fish species in the upper Yangtze River