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• W3120859460 startingPage "144986" @default.
• W3120859460 abstract "Suspended sediment is an important phosphorus (P) adsorption medium in river catchments. Early adsorption isotherm models often ignored sediment heterogeneity, resulting in incorrect sediment P estimates in field environments. In the Three Gorges Reservoir (TGR), China, P load assessment is essential to eutrophication risk management, but the sediment P evolution in the TGR is unclear. Herein, the P-adsorption capacity of suspended sediment was estimated with an improved Langmuir model via sediment parameter consideration, and the long-term distribution and variations in simulated sediment P with sediment transport were assessed from 2003– 2016. The results showed that the improved Langmuir model attained a good fit with experimental and field data. The sediment load entering the TGR significantly decreased, especially the median size (D50) fraction smaller than 0.008 mm, resulting in long-term discharged sediment load decline and annual mean D50 increase. Meanwhile, the annual sediment P load in the TGR decreased from 7.46– 22.38 kg/s in 2003 to 1.74– 4.73 kg/s in 2016. The increasing sediment particle size reduced the sediment P load and was sensitive to the low sediment P load in the regular impoundment stage (September 2008– 2016). The flood season (June–September) transported 69.2– 98.6% of the annual sediment P. Around 62.3% of total sediment P load was retained in the TGR from 2003– 2016. The results revealed that the retention role of the Three Gorges Dam (TGD) facilitated the long-term reduction in fine sediment and sediment P in the TGR downstream. This study highlights the importance of the particle size in P-adsorption capacity estimation with suspended sediment transport." @default.
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• W3120859460 date "2021-05-01" @default.
• W3120859460 modified "2023-10-02" @default.
• W3120859460 title "Spatial-temporal distribution of sediment phosphorus with sediment transport in the Three Gorges Reservoir" @default.
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• W3120859460 doi "https://doi.org/10.1016/j.scitotenv.2021.144986" @default.
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