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Spatiotemporal optical properties of dissolved organic matter in a sluice-controlled coastal plain river with both salinity and trophic gradients

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Journal of Environmental Sciences 2023年第7期129卷 1-15页

作者： Yu Liu Yucheng Hu Chengxun Yu Yuqi Gao Zhenying Liu Khan M.G.Mostofa Siliang Li Yumei Hu Guanghui Yu School of Earth System Science Institute of Surface-Earth System ScienceTianjin UniversityTianjin 300072China Tianjin Hydraulic Science Research Institute Tianjin 300061China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300191China School of Mathematics Tianjin UniversityTianjin 300072China

Due to the combined effect of sluices and sea tide,the sluice-controlled coastal plain river would be characterized by both trophic state and salinity gradients,affecting the spatiotemporal optical properties of dissolved organicmatter(DOM).In this study,we investigated the spatiotemporal variation of water quality parameters and optical properties of DOM in the Haihe River,a representative sluice-controlled coastal plain river in Tianjin,China.A significant salinity gradient and four trophic states were observed in the water body of the Haihe *** humic-and one protein-like substances were identified from the DOM by the three-dimensional fluorescence spectra combined with the parallel factor(PARAFAC)***’s correlation analysis and redundancy analysis(RDA)showed that the salinity significantly affected the abundance of chromophoric DOM(CDOM)but did not cause significant changes in the fluorescence optical *** addition,the effect of trophic state index(TSI)on the CDOM abundance was greater than that on the fluorescence intensity of fluorescent dissolved organic matter(FDOM).In the water body with both salinity and trophic state gradients,TSI posed a greater influence than salinity on the CDOM *** results fill the research gap in spatiotemporal DOM characteristics and water quality variation in water bodies with both salinity and trophic state *** results are beneficial for clarifying the joint influence of saline intrusion and sluices on the DOM characteristics and water quality in sluice-controlled coastal plain rivers.

关键词： Dissolved organic matter Optical characteristics trophic state index Salinity gradient Haihe River Sluice-controlled coastal plain river

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Numerical modeling of nutrient transport to assess the agricultural impact on the trophic state of reservoirs

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International Soil and Water Conservation Research 2023年第1期11卷 197-212页

作者： Franklin Torres-Bejarano Jesús García-Gallego Javier Salcedo-Salgado Department of Environmental Engineering University of CordobaCarrera 6 No.77-305230002MonteriaColombia Environmental Engineering Program University of CordobaCarrera 6 No.77-305230002MonteriaColombia

A trophic state increase relates to surface water bodies nutrient enrichment,due to the chemical products used such as fertilizers in agriculture and residues from cattle raising *** research consists of nutrient transport numerical modeling to analyze the Betancíreservoir trophic state in Colombia;Water samples were collected to analyze total nitrogen,total phosphorus,ammonia,nitrates,nitrites,phosphates,chlorophyll-a,dissolved oxygen,BOD,COD,suspended solids,and water *** water quality model MOHID Studio was implemented and after its calibration,scenarios of increase and decrease of nutrients and inflows to the reservoir through its main tributaries were simulated to reproduce the agricultural activity changes in the basin and the effects that would have on the reservoir's trophic state dynamics;Therefore,the Carlson trophic Status index was calculated for each *** results show that variations in total nitrogen concentration and increased inflows present short-term consequences on the reservoir's trophic *** the incoming total nitrogen con-centrations by 100%causes the reservoir to change from a light eutrophic to a hypereutrophic *** results of this research provide a starting tool to water resources integrated management in reservoirs.

关键词： Environmental modeling trophic state index Nutrient transport Eutrophication Water pollution

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Study on the Relationship between Chlorophyll-a and Environmental Impact Factors in Deep Reservoir in Karst Areas——Taking Aha Reservoir for Example

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Meteorological and Environmental Research 2011年第3期2卷 49-52页

作者： XIA Pin-hua,LIN Tao,LI Cun-xiong,XUE Fei,ZHANG Bang-xi Key Laboratory of Mountainous Environmental Information System and Ecological Environment Protection in Guizhou Province,Guizhou Normal University,Guiyang 550001,China

[Objective] The aim was to study the relationship between chlorophyll-a and environmental impact factors in deep reservoir in Karst Areas.[Method] Taking Aha Reservoir for example,the changes of chlorophyll-a content and its relationship with environmental impact factors were researched,and the water quality of Aha Reservoir was assessed by means of modified Carlson trophic state index.[Result] Chlorophyll-a content in Aha Reservoir was higher in March,April,May and September and lower from June to August,and there was obvious seasonal variation,namely its variation trend was spring>summer>autumn>*** addition,chlorophyll-a content showed extremely significant correlation with transparency and dissolved oxygen (Ptrophic state index was higher in whole year in Aha Reservoir which was in moderate trophic state in August,October and November and eutrophic state in other months.[Conclusion] The study could provide scientific reference for discussing the mechanism of lake eutrophication.

关键词： Aha Reservoir Chlorophyll-a Environmental factors trophic state index China

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Assessment of the trophic Status by Monitoring of Reservoir’s Water Quality

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Journal of Water Resource and Protection 2015年第1期7卷 1-13页

作者： Milka M.Vidovic Marko N.Rodic Marija U.Vidovic Ivana S.Trajkovic Sanja Z.Jovanic Department for Ecology and Technoeconomics The Institute of ChemistryTechnology and MetallurgyUniversity of BelgradeBelgradeSerbia Faculty of Geography University of BelgradeBelgradeSerbia School of Electrical Engineering University of BelgradeBelgradeSerbia

Continuous long-term monitoring of aquatic systems is important for understanding their complete evolution in order to monitor changes in the trophic status and water quality. The continuous monitoring during a period of 20 years, by sampling once a month at two locations, the water quality of reservoir “Grliste”, which is used for the water supplying town Zajecar (Eastern Serbia), is observed and developmental stages in the life of the reservoir were determinated. It should be noted that the obtained results were used also in the purpose of finding a cause of cyanobacteria bloom, as a consequence of algal production. Limiting factors of algal production usually were nitrogen and phosphorus, however, in this study, obtained results of subtraction between trophic state index, calculated through total chlorophyll a (TSIChl-a) and trophic state index, calculated through total phosphorus (TSITP), indicated that limiting factor of algal production was light. On the basis of the concentrations of dissolved oxygen (DO), total phosphorus (TP) and chlorophyll a (Chl-a) in the surface and in the bottom, it was concluded that the reservoir passed through four development phases during the examined period. Results of long-term monitoring showed that in the first years after the formation of the reservoir, the highest trophicity was detected (hypereutrophic status), but later the reservoir mostly maintained eutrophic status.

关键词： Monitoring Reservoir trophic state index Eutrophication Cyanobacteria

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