Impact of the Charleston Ocean Dredged Material Disposal Site on nearby hard bottom reef habitats

Crowe, Stacie E.; Gayes, P. T.; Viso, R. F.; Bergquist, Derk C.; Jutte, Pamela C.; Dolah, Robert F. Van

doi:10.1016/j.marpolbul.2009.12.007

Cited by 11 publications

(4 citation statements)

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“…The impacts of dredging and disposal of sediment on the marine habitat are not unique to the Brazilian continental shelf. These problems have attracted attention worldwide (Gibbs & Angelidis, 1989;Cruz-Motta & Collins, 2004;Bolam et al, 2006;Ware et al, 2010;Crowe et al, 2010;Bolam, 2012;Chung et al, 2017). The disposal of excavated material can have a negative impact on the marine environment and, depending on the local hydrodynamics, such impacts may not only be restricted to the immediate area of dumping.…”

Section: Discussionmentioning

confidence: 99%

Geomorphic and Sedimentary Impacts on the Continental Shelf after Accumulated Dredge Disposal from Rio de Janeiro Harbor, Brazil

Dias¹,

Fontana²,

Silva³

et al. 2019

Braz J Geophys

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ABSTRACT.Marine dredging is a sub-aquatic excavation activity executed around the globe for various purposes by many industries. The negative impacts ofdredged material discharge on benthic ecosystems are diverse. Researches on the results of dredging on estuarine geomorphology and its sedimentary regime areusual. Still, the results of dumping dredged material off the coast, in the Brazilian continental shelf, are not easily found in the literature. The present research evaluatedthe geomorphic disturbance resulted from discharging dredged material from Rio de Janeiro Harbor in the inner Rio de Janeiro continental shelf. Grain size analysisof the dredged and dumped sediments was compared to the inner shelf original seabed sediments. The geomorphological impact was evaluated through bathymetricand high resolution seismic and side scan sonar imagery methods. Obtained data revealed significant geomorphologic changes on the offshore bottom caused by theaccumulation of compacted mud from the dredge site underlying the recent soft mud bottom of the harbor area. Besides the morphological sea bottom disturbance,sediment accumulation, and local grain size characteristics exhibited significant change, potentially impacting the surrounding benthic environment.Keywords:compacted mud, Guanabara Bay, grain size.RESUMO.A dragagem marinha é uma atividade de escavação subaquática executada em todo o mundo por muitas indústrias para diferentes fins. Os impactosnegativos do descarte de material dragado nos ecossistemas bentônicos são diversos. Pesquisas sobre os resultados da dragagem na geomorfologia estuarina e o seuregime sedimentar são frequentes. Ainda assim, os resultados do despejo de material dragado ao longo da costa, na plataforma continental brasileira, não são facilmenteencontrados na literatura. A presente pesquisa avaliou o distúrbio geomórfico resultante do descarte de material dragado do Porto do Rio de Janeiro na plataformacontinental interna do Rio de Janeiro. A granulometria dos sedimentos dragados e descartados foi comparada com os sedimentos originais do fundo marinho naplataforma interna. O impacto geomorfológico foi avaliado através de métodos batimétricos, sísmica de alta resolução e imageamento por sonar de varredura lateral.Os dados obtidos revelaram mudanças geomorfológicas significativas no fundo causadas pelo acúmulo de lama compactada do local dragado, subjacente ao fundode lama mole recente da área do porto. Além do distúrbio morfológico do fundo marinho, o acúmulo de sedimentos e as características locais de tamanho de grãoapresentaram mudança significativa, potencialmente impactando o ambiente bentônico circundante.Palavras-chave:lama compactada, Baía de Guanabara, granulometria.

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Section: Discussionmentioning

confidence: 99%

Geomorphic and Sedimentary Impacts on the Continental Shelf after Accumulated Dredge Disposal from Rio de Janeiro Harbor, Brazil

Dias¹,

Fontana²,

Silva³

et al. 2019

Braz J Geophys

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“…Management alternatives have been developed, including the use of confined disposal facilities. Accordingly, in the US, since the enforcement of the existing ocean dumping permit plan in 1973, DM has been disposed of in placement areas designated by the United States Environmental Protection Agency (USEPA) [8]. Other management alternatives include disposal in landfills and the beneficial reuse of DM [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Reusing Dredged Material through Stabilization with So-Called Bio-Enzyme Products

Rabbanifar,

Nguyen,

Qian

et al. 2023

Buildings

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Sediments are dredged from waterways to maintain maritime activities and prevent floods. Exorbitant amounts of money are budgeted for the removal of dredged material (DM) and its disposal in landfills. We investigated the potential for reuse of DM as a road construction material using so-called bio-enzyme products as stabilizing agents. To improve the mechanical properties of DM, such as compressive strength, compressibility, Atterberg limits and the California bearing ratio (CBR), mixtures of DM were tested with two different amounts of a commercially available bio-enzyme product, which yielded enzymatically stabilized dredged material (ESDM). Unconfined compressive strength (UCS), compaction and Atterberg limits were measured in accordance with ASTM specifications on all samples. Data show that the addition of bio-enzymes resulted in increases in UCS but did not affect the optimum moisture content (OMC), maximum dry unit weight or Atterberg limits of the DM. A comparative field study was carried out to evaluate the CBR of the CH subgrade before and after treatments with the bio-enzyme product and with lime as a traditional stabilizing agent. The results of the field study supported the laboratory findings. Based on these data and results from the literature, models predicting the effect of bio-enzyme treatments on the value of CBR and of UCS were developed statistically. These models also underlined the importance of the clay fraction and PI values for the improvement of the engineering properties of soil using bio-enzyme additives.

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“…The peer-reviewed literature is rich with methods for the characterization of dredged material prior to disposal [6,[10][11][12][13][14][15]. However, postdisposal monitoring has focused mainly on impacts on the benthic community [16][17][18][19][20][21][22][23]. Few postdisposal monitoring studies in the peer-reviewed literature document the chemical recovery of aquatic disposal sites.…”

Section: Introductionmentioning

confidence: 99%

Monitoring chemical and biological recovery at a confined aquatic disposal site, Oslofjord, Norway

Oen

Pettersen

Eek

et al. 2017

Enviro Toxic and Chemistry

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The recovery of the confined aquatic disposal (CAD) facility located at Malmøykalven in Oslofjord, Norway, has been assessed using an array of field measurement techniques. These methods were used prior to the disposal of dredged sediments as well as during 3 annual postdisposal monitoring campaigns. Traditional sampling to assess chemical recovery indicates that an immediate reduction in total sediment concentrations and surface sediments can be characterized as having good quality. Deposition of new material indicates that the quality of depositing material at the CAD is stabile and representative of the natural background quality in the area. Continued deposition of this material will improve the long-term chemical recovery of the CAD. A positive biological recovery of the benthic community has been observed and is expected to continue along a typical benthic succession pattern. To supplement traditional sampling, passive samplers were deployed at the CAD. Results suggest that the flux and concentrations of polycyclic aromatic hydrocarbon 16 and polychlorinated biphenyl 7 released from the CAD will continue to decrease over time. The combined results from these multiple lines of evidence indicate that the CAD and capping layer function as predicted 3 yr after the construction was completed. There is not only an improvement in the efficacy of the CAD itself but also a general improvement of the area, compared with the situation prior to disposal. Environ Toxicol Chem 2017;36:2552-2559. © 2017 SETAC.

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Impact of the Charleston Ocean Dredged Material Disposal Site on nearby hard bottom reef habitats

Cited by 11 publications

References 11 publications

Geomorphic and Sedimentary Impacts on the Continental Shelf after Accumulated Dredge Disposal from Rio de Janeiro Harbor, Brazil

Geomorphic and Sedimentary Impacts on the Continental Shelf after Accumulated Dredge Disposal from Rio de Janeiro Harbor, Brazil

Reusing Dredged Material through Stabilization with So-Called Bio-Enzyme Products

Monitoring chemical and biological recovery at a confined aquatic disposal site, Oslofjord, Norway

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