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• W4224288891 abstract "Abstract Diversion rivers are important water and biological connection channels, which provide valuable ecological services. However, diversion rivers are degraded owing to the construction and unreasonable operation of large-scale water conservancy projects. Quantifying and guaranteeing the ecological flow of diversion rivers is necessary to sustain the riverine ecosystems. Due to the lack of methods to verify the rationality of the existing hydrological series length for ecological flow calculation by hydrological methods, a Monte Carlo-length of record (MC-LOR) algorithm was proposed to analyze the accuracy level of the existing hydrological series. Taking the Dongjing River (DJR) in the lower Han River as an example, the result shows that the 15-year hydrological series can meet the accuracy level of 5/90 and 10/95. The flow changes and hydrological relationships between the Qianjiang hydrological station (QJS) and the Tianguan River (TGR) under the influence of the Middle Route of South-to-North Water Transfer (MSNW) project and the Yangtze–Han Water Diversion (YHWD) project were analyzed. It is found that the flow variation of QJS is large and shows a downward trend while TGR displays a significant upward trend through the M-K trend test. And the flow of QJS is drier and less than the water replenishment of TGR in the non-flood season after the operation of the MSNW project. This paper established an ecological flow threshold calculation method based on kernel density curves and quantiles. Compared with the minimum average monthly flow (MAMF) method, the monthly minimum ecological runoff (MMR) method, improved Q90 method, Tennant method, Tessmann method, distribution flow method (DFM), the method proposed in this paper can reduce the influence of extreme flow events and is suitable for the diversion river. Finally, the ecological water replenishment demands of TGR to meet the ecological flow target of DJR under different flow conditions in the Han River were analyzed by Bayesian network (BN) models. The results show that the minimum water requirement thresholds of DJR are 31.3m 3 /s and 15.85m 3 /s, 55.35m 3 /s and 30.85m 3 /s when the flows of Han River are < 654m 3 /s and 654 ~ 770m 3 /s in non-flood season and < 875m 3 /s and 875 ~ 1210m 3 /s in flood season, respectively. This research provides references for the ecological stability and sustainable development of diversion rivers." @default.
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• W4224288891 date "2022-04-20" @default.
• W4224288891 modified "2023-10-18" @default.
• W4224288891 title "Research on ecological flow and water replenishment threshold for diversion river based on MC-LOR" @default.
• W4224288891 doi "https://doi.org/10.21203/rs.3.rs-1526138/v1" @default.
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