| Citation: | LU Y,WU Z H,LIU Q Y,et al.Evaluation of habitat restoration effect based on fish spawning requirements[J].Journal of Environmental Engineering Technology，2023，13（2）：733-741 doi: 10.12153/j.issn.1674-991X.20220532
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It is vital to evaluate the restoration effect according to the spawning needs of fish to master the habitat status and guide the project design. Taking the Heishui River as an example and starting from the habitat requirements of fish spawning, in order to obtain the real restoration effect of the restoration project on fish spawning habitat, the reference status of spawning habitat was quantified through on-site monitoring of real spawning sites and numerical simulation. An index system was constructed to evaluate the quality of fish spawning habitat. The results showed that the comprehensive evaluation scores of fish habitat in the spawning period of the Heishui River from 2019 to 2021 were 63.04, 83.52 and 83.52, respectively, indicating that the fish spawning habitat had been improved year by year. The evaluation results showed that the ecological restoration project had an obvious effect on the restoration of the spawning habitat. Moreover, the spatial distribution of fish spawning habitat quality in different reaches of the Heishui River showed that the downstream reach (R4-R6) before restoration was better than the upstream reach (R1-R3). After restoration, the scores of different reaches increased in varying degrees, with an increase of 21.33%-59.15%. Through tracing the source of sensitive factors, it could be seen that the habitat quality of fish spawning in the Heishui River before restoration was mainly limited by river connectivity and hydraulic conditions, and the connectivity had been greatly improved after restoration. However, there was still a certain gap between the water flow velocity and Froude number and the preference for protecting fish spawning. In the later restoration work, local shaping and improvement of water flow pattern should be carried out according to the preference of fish spawning.
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