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How sediment dredging alters phosphorus dynamics in a lowland rural river?
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How sediment dredging alters phosphorus dynamics in a lowland rural river?
China's lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic activities.However,quantifying P dynamics in a low-land rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this challenge.This model was coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynam-ics under the impact of dredging in a lowland rural river.Based on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,China,the cou-pled model was calibrated and achieved a model performance(R2＞0.59,RMSE＜0.04 mg/L)for total P(TP)concentrations.Our research in the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was～300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23％after dredg-ing.(2)Dredging significantly reduced P release from sediment by 98％,while increased P resuspension and settling capacities by 16％and 46％,respectively.(3)The sediment-water interface(SWI)plays a critical role in P transfer within the river,as resuspension accounts for 16％of TP imports,and settling accounts for 47％of TP exports.Given the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promis-ing approaches to enhance P retention capacity.Our study provides valuable insights for local environmental departments,allowing a comprehensive understanding of P dynamics in lowland rural rivers.This enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.
NETL
NSTL
万方数据
