Evaluating nutrient distribution and eutrophication pattern in a shallow impounded lake: Exploring the influence of floods  

作　　者：Fuxin Zhang Hongwu Tang Guangqiu Jin Yantao Zhu Hong Zhang Rodney Anthony Stewart Edoardo Bertone Saiyu Yuan 

机构地区：[1]National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China [2]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China [3]Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources,Hohai University,Nanjing 210098,China [4]School of Engineering and Built Environment,Griffith University,Queensland 4222,Australia [5]Cities Research Institute,Griffith University,Queensland 4222,Australia [6]Australian Rivers Institute,Griffith University,Queensland 4111,Australia

出　　处：《International Journal of Sediment Research》2024年第3期375-385,共11页国际泥沙研究（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFC3202603);the National Natural Science Foundation of China(Grant No.52209082);the Fundamental Research Funds for the Central Universities China(Grant No.B220202057);the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20220979 and BK20220993);the Jiangsu Funding Program for Excellent Postdoctoral Talent China(Grant No.2022ZB171).

摘　　要：Water quality management in shallow impounded lakes is challenging due to nutrient's enrichment and algal blooms.Lake Hongze is a reservoir for the South-to-North Water Diversion Project's Eastern Route and an essential water source for Jiangsu Province,China,and its water quality closely relates to the local aquatic ecosystem and affects the water supply security of the surrounding areas.The spatial and seasonal patterns of total nitrogen,total phosphorus(TP),and chlorophyll-a(Chl-a)in the lake were investigated and the effects of floods on these patterns were assessed.Hydrological data and trophic state parameters were analyzed using 7 years of monitoring data from 16 water sampling sites throughout the lake.The statistical analysis revealed the seasonal variation characteristics affected by floods and the differences in material transport continuity between inflow and outflow boundaries.Eutrophication assessment using the trophic level index and Chl-a concentrations also indicated eutrophication was concentrated at the southeast side of the lake.Spatial interpolation of Chl-a using the ordinary kriging method clarified that existence and movement of the localized eutrophication area in Lake Hongze.The mass balance calculations of TP indicated that a substantial amount of phosphorus entered the lake during the flood season,however,most severe algal blooms occurring after the flood season.The onset of algal blooms exhibits a significant time lag in response to phosphorus input,primarily due to the influence of hydrodynamic processes within the lake during the flood season.

关 键 词：Algal bloom Trophic state CHLOROPHYLL-A Lake Hongze 

分 类 号：X524[环境科学与工程—环境工程] X173