ASSESSING WATER QUALITY CHANGES CAUSED BY DREDGING OPERATIONS IN SANTOS ESTUARY, SÃO PAULO, BRAZIL
DOI:
https://doi.org/10.38087/2595.8801.297Keywords:
Water quality, Turbidity, Dredging, Santos EstuaryAbstract
Dredging activity may cause sediment resuspension, altering water quality regarding to dissolved oxygen and conductivity (measured in the field), turbidity, total suspended solids and nutrients (such as phosphorus and total organic carbon), analyzed in the laboratory. In this work ten sampling campaigns were performed in four areas of Santos harbor’s navigation channel, with different grain sizes, in order to monitor along one hour, the variation of these parameters in the sediment plume formed due to dredging activity. A previous campaign was carried out before dredging activities. This study showed that despite of variations in the results of the investigated parameters, these variations are of small magnitude and of short duration.
References
Anchor Environmental, CA L.P, 2003. Literature review of effects of resuspended sediments due to dredging operations. California. 140p.
APHA; AWWA; WEF, 2023. Standard Methods for the Examination of Water and Wastewater, 24th edition, 2023.
Bohlen, W. F.; Cunhdy, D. F.& Tramontano, J. M. 1979. Suspended material distribution in the wake of estuarine channel dredging operations. Estuarine and Coastal Marine Science 9( 6): 699-711.
Brasil (1997). Resolução Conama n° 237, de 19 de dezembro de 1997. Dispõe sobre a revisão e complementação dos procedimentos e critérios utilizados para o licenciamento ambiental. Ministério do Meio Ambiente. Conselho Nacional do Meio Ambiente – Conama
Brasil (2012). Resolução Conama n° 454, de 01 de novembro de 2012. Estabelece as diretrizes gerais e os procedimentos mínimos para a avaliação do material a ser dragado em águas sob jurisdição nacional. Ministério do Meio Ambiente. Conselho Nacional do Meio Ambiente – Conama
Bray, R.N. (2008). Environmental aspects of dredging. Leiden: Taylor & Francis, 398p.
Collins, M.A. 1995. “Dredging-Induced Near-Field Resuspended Sediment Concentrations and Source Strengths”, Miscellaneous Paper D-95-2, US Army Engineer Waterways Experiment Station.
Fundação Ricardo Franco, FRF. (2008). Estudo de Impacto Ambiental (EIA) e Relatório de Impacto Ambiental (RIMA): projeto de aprofundamento do canal de navegação do Porto de Santos, Santos, SP. São Paulo, 2008.
Havis, R.N. 1988. “Sediment Resuspension by Selected Dredges”, Effects of Dredging Technical Notes EEDP-09-02, Army Engineer Waterways Experiment Station, Vicksburg, MS.
Hayes, D.F. 1986. Guide to Selecting a Dredge for Minimizing Resuspension of Sediment, Effects of Dredging Technical Notes EEDP-09-01, Army Engineer Waterways Experiment Station, Vicksburg, MS.
Herbich, J.B., Brahme, S.B., 1991. “Literature Review and Technical Evaluation of Sediment Resuspension During Dredging”, Contract Report HL-91-1, Prepared for the Department of the Army, Washington, D.C: U.S. Army Corps of Engineers.
Lee, GF, R. Jones, F. Saleh, G. Mariani, D. Homero, J. Butler, e P. Bandyopadhyay, 1978. Avaliação do Teste de elutriato como um método de previsão de Lançamento Contaminante durante Eliminação de Águas Abertas Sedimentos dragados e Impacto Ambiental de Águas Abertas Descarte do material dragado, vol. II: Dados do relatório. Relatório Técnico D-78-45, EUA Army Corps of Engineers WES, Vicksburg, MS.
Miller, J.L, Palermo, M.R., Groff, T. W. (2002). Field Evaluation of hopper dredge overflow for the Delaware. Army Corps of Engineers.
Puckette, T. P. (1998) “Evaluation of dredged material plumes—Physical monitoring techniques,” DOER Technical Notes Collection (TN DOER-E5), U.S. Army Engineer Reseach and Development Center, Vicksburg, MS. www.wes.army.mil/el/dots/doer
Da Rocha, A .B; Gama, A. M. C.N da; Mendonça, A.S.F; Guimarães. A.F; Rigo, D; Teixeira, E.C; Amorim, F.N. de; Castro, M.S.M. (2003) Monitoramento de plumas de turbidez na dragagem no complexo estuário de Tubarão. In: 4º Seminário de Meio Ambiente Marinho, Rio de Janeiro. Acesso: http://sobena.org.br/publicacoes.asp?pesq=dragagem&Submit=Pesquisar
Smith, S.J & Friedrichs. C.T (2011) Size and settling velocities of cohesive flocs and suspended sediment aggregates in a trailing suction hopper dredge plume. Continental Shelf Research. n 31S50-S63.
Santos, C. R., Casagrande, A.S., Iturrioz, I. (2010). Análise crítica do monitoramento ambiental do trecho do rio – Gravataí –RS. In 23º Congresso Nacional de Transporte Aquaviário, Construção Naval e Offshore, Rio de Janeiro, RJ.
USACE- Army Corps of Engineers (1977). A laboratory study of the turbidity generation potential of sediments to be dredged. 154 p.
US EPA (2023). Hazardous Waste Test Methods / SW-846. Available at: <https://www.epa.gov/hw-sw846>. Accessed 07/28/2023.
