Decreased mobility of heavy metals in Haihe River sediments: The possible role of tide gate

Wu, Guowei; Pan, Ling; Wei, Qi; Guo, Liang

doi:10.1016/j.gexplo.2015.06.002

Cited by 17 publications

(3 citation statements)

References 36 publications

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“…Nesse sen� do, os resultados mostraram que os metais-traço armazenados no fundo subaquá� co podem ser removidos do reservatório sedimentar por meio de mecanismos naturais ou antropogênicos. A primeira hipótese pode ser o resultado da variação das condições � sico-químicas da coluna d'água (por exemplo, pH, potencial redox, matéria orgânica e salinidade) (Wu et al, 2015) como resultado das oscilações da maré estuarina e da cunha salina. Por outro lado, o trabalho constante de dragagem necessário para manter as profundidades na bacia de evolução dos navios pode afetar a estabilidade dos sedimentos de fundo e, assim, remobilizar os poluentes depositados de volta à coluna d'água (Monte et al, 2019).…”

Section: Resultsunclassified

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Delgado

Lima

Vieira

et al. 2023

S&G

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As variações da coluna d'água no ambiente aquático, motivadas por processos naturais ou antropogênicos, podem afetar a estabilidade de metais-traço no sedimento do Complexo Portuário de Santos (CPS), localizado no sudeste do Brasil. Metais-traço, como Cu, Zn, Ni, Pb e Cd, podem afetar negativamente os compartimentos ecológicos e biológicos da água estuarina. Para avaliar a condição do sedimento do CPS, este artigo investigou a fração geoquímica de metais-traço sedimentares aplicando a abordagem de extração sequencial BCR (European Community Bureau of Reference - Gabinete de Referência da Comunidade Europeia). A matéria orgânica e o tamanho de grão fino, característicos de um ambiente estuarino, mostraram uma influência direta na dinâmica de concentração de metais-traço em sedimentos, especialmente para Pb, Cd e Ni. No caso específico de Zn e Cu, havia uma possível fonte de contaminação no porto. A maior fração dos metais estudados era não residual, potencialmente mobilizável em um ambiente em que a variação dos parâmetros físico-químicos da coluna d'água é altamente variável, algo frequente em ambientes estuarinos. Palavras-chave: especiação de metais-traço; Porto de Santos; sedimento; impacto ambiental.

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Section: Resultsunclassified

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Delgado

Lima

Vieira

et al. 2023

S&G

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“…As shown in Figure 7, total dissolved Pb sharply decreased with salinity gradient, expect for the Zhimaihe River. It previously demonstrated that salinity could induce the flocculation of Pb in river water and this behavior was nonconservative (Wu et al, 2015). However, Pb in different phase express different behavior.…”

Section: The Roles Of Salinity Ph and Temperaturementioning

confidence: 99%

Fractionation of toxic metal Pb from truly dissolved and colloidal phases of seaward rivers in a coastal delta

Ren¹,

Schmidt²,

Li³

et al. 2023

Front. Mar. Sci.

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Colloids of natural river water is a key intermediate carrier of lead (Pb). It is important to monitor the transport–transformation behavior of Pb in the colloidal phase of seaward water because this behavior is related to the levels of pollution input and environmental risks posed to the sea, especially in coastal delta areas. In this study, the fractionation behavior and distribution of toxic Pb from the truly dissolved phase and the different colloidal phases in seven seaward rivers in the Yellow River Delta were investigated. The concentrations of total dissolved Pb, truly dissolved Pb, and colloidal Pb were 0.99–40.09 μg L–1, 0.40–8.10 μg L–1, and 0.60–35.88 μg L–1, respectively. In freshwater rivers, the main component of total dissolved Pb (about > 50%) is truly dissolved Pb but the main component of total dissolved Pb in the seawater environment is colloidal Pb (> 80%). A dramatic increase in salinity causes the deposition (about ≈94%) of all forms of Pb to sediment from estuarine water in winter. However, this sedimentation behavior of colloidal Pb gradually decreases (in the Shenxiangou River) when the river salinity approaches seawater salinity (S = ≈29). In the industrial port (Xiaoqinghe River) and mariculture (Yongfenghe River) estuarine areas, which have extensive seawater, the deposition behavior of colloidal Pb (<15%) is less affected by the change in salinity. This suggests that human activity contributes to the spread of Pb in the offshore environment. The concentration of 100 kDa–0.22 μm Pb has a postive correlation with total colloidal Pb. Its variation is minimally affected by salinity compared with other colloidal components. In addition, the correlation between the molecular weight and aromaticity of chromophoric dissolved organic matter (CDOM) and colloidal Pb suggests that macromolecules in seawater will be important transport carriers of Pb. In all, truly dissolved Pb is the main transport form of dissolved Pb in river freshwater; however, in brackish water in estuaries, colloidal matter gradually becomes the main transport carrier. Surging salinity immobilizes truly dissolved Pb in the estuarine region, but colloidal matter inhibits this deposition. Colloidal phase is the important conversion for land–sea transport of Pb by seaward rivers.

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“…Tidal control gates and barriers are structural methods of managing flooding due to tidal influences, particularly in agricultural and urban areas (Walsh and Miskewitz, 2013;Department of Irrigation and Drainage Malaysia, 2020). They are mainly used in estuaries and downstream areas (Wu et al, 2015). The ability of tidal control gates to provide flood protection depends on how and for how long they are in operation (Li et al, 2017;Zhang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of tidal control gates in flood-prone areas during high tide appearances

Yasmin

Razali

Sharil

et al. 2022

Front. Environ. Sci.

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Managing floods in low-lying coastal plains are challenging because of the complexity of the underlying physical processes and the combination of factors such as high tides and, severe storm events. In Malaysia, there were concerns from local people about the construction of a tidal control gate that is believed to contribute to the causes of local flooding. The performance of tidal control gates as flood control structures was studied to determine their significance and importance. The objective of this study is to evaluate the effectiveness of tidal control gates in reducing the impact of floods during high tide with severe storm events. The methodology of the study requires the usage of the hydrodynamic model using design rainfall for three scenarios with land use changes in 2015 and 2020. Three feasible scenarios were identified and further investigated. Scenario 1: without a tidal control gate; Scenario 2: with the existing tidal control gate fully open; and Scenario 3: with the existing tidal control gate fully closed. The simulation result clearly shows that the floodplain is smaller in 2015 as compared to the land use changes in 2020 because of land use permeability. In addition, the floodplain for Scenarios 2 and 3 in 2015 and 2020 is 2%–3%, respectively, smaller than that of Scenario 1 for the 20-year average recurrence interval and 3%–8%, respectively, smaller for the 100-year average recurrence interval. The results showed the influence of heavy rainfall whereby the maximum downstream discharge increment varied from 4.06% to 4.28% during high tide. Whereas the flow level for the 100-year average recurrence interval shows an increment from 0.52% to 1.53%. If the tidal control gate is not operated properly it will cause the tidal water to flow back into the upstream areas thus exposing to an increased floodplain area ranging from 2.3% to 8.4%. Which emphasizes the importance of operational methods for tidal control gate in determining its efficiency. However, further studies should also be done on the reduction of damage value involved with the construction of tidal control gate, its value in saving lives, property and in other parts of the world having different tidal variations.

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Decreased mobility of heavy metals in Haihe River sediments: The possible role of tide gate

Cited by 17 publications

References 36 publications

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Extração sequencial BCR para frações geoquímicas e avaliação de Zn, Ni, Cd, Cu e Pb nos sedimentos costeiros no Complexo Portuário de Santos, Sudeste do Brasil

Fractionation of toxic metal Pb from truly dissolved and colloidal phases of seaward rivers in a coastal delta

Effectiveness of tidal control gates in flood-prone areas during high tide appearances

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