Evaluation of habitat quality and ecological flow in a regulated waterway
| Autor: | Junhu Nan, Yian Liu, Yao Chen, Shufeng Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Water Supply, Vol 23, Iss 2, Pp 546-563 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1606-9749 1607-0798 34440860 |
| DOI: | 10.2166/ws.2022.433 |
| Popis: | Dam control changes the hydraulic environment and hydrological rhythm of rivers; to explore the causes of fish habitat loss and influence of river regulation in such rivers, the downstream curving reaches of Shaying River were cut off. Grass, silver, and bighead carp were selected as the research targets, and the impact of waterway regulation and the effect of gravel mounds on the target fish habitat were studied using numerical simulation. The results show that the original channel's hydraulic environment is similar to the artificial channel, and the target fish spawning habitat is limited, which is an important reason for the shortage of fish resources in the research area. The reconstructed channel can meet the river's navigation demands and improve the channel's flood discharge capacity. The habitat method was used to estimate the minimum and appropriate ecological flows of the target fish at each growth stage in the original and reconstructed rivers. Under the appropriate ecological flow, the weighted usable area (WUA) of juvenile, migratory, and spawning habitats of the target fish in the reconstructed river increased by 168, 24, and 580%, respectively, compared to the original channel, while the WUA of adult fish that preferred a slow-water environment decreased by 62%, effectively improving the target fish's spawning environment. HIGHLIGHTS The habitat distribution of the four major Chinese carps in the whole life cycle was screened and analyzed.; The study shows the complete research process from waterway regulation to biological habitat restoration to ecological flow calculation.; A biological habitat restoration scheme with gravel mounds was adopted, and the navigation and flood discharge capacity of the waterway was not affected.; |
| Databáze: | Directory of Open Access Journals |
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