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Temporal Variability of Suspended-Solids Concentration in the Estuarine Channel of Patos Lagoon, Southern Brazil
Open AccessArticle

Dispersion Plumes in Open Ocean Disposal Sites of Dredged Sediment

1
Laboratório de Oceanografia Costeira e Estuarina, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), CP 474, Rio Grande 96201-900, Brazil
2
Centro de Ciências Computacionais, Universidade Federal do Rio Grande (FURG), CP 474, Rio Grande 96201-900, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Roger Falconer
Water 2021, 13(6), 808; https://doi.org/10.3390/w13060808
Received: 30 December 2020 / Revised: 21 February 2021 / Accepted: 2 March 2021 / Published: 15 March 2021
Management of estuarine systems under anthropogenic pressures related to port settlement and development requires thorough understanding about the long-term sediment dynamics in the area. In an era of growing shipping traffic and of ever larger ships; millions of tons of bottom sediments are dredged annually all over the world and the major question concerning dredging operations is not whether they should be done, because it is obvious that they are extremely important and necessary, but where the dredged sediments can be disposed of with the least possible ecological impact. The present study involves the evaluation of transport trends of dredged material from a turbid estuary disposed of in four different open ocean disposal sites using numerical model techniques, aiming to contribute to minimizing potential environmental impacts and maximizing efficiency of the dredging operation. The study is carried out in southern Brazil, investigating the fate of dredged material from the Port of Rio Grande, located inside the Patos Lagoon estuary. Simulations were carried with the TELEMAC-3D model coupled with the suspended sediment (SEDI-3D) module and incorporating results from the wave module (TOMAWAC) to evaluate the dispersion of the suspended sediment plume and its interaction with coastal currents. This modeling structure proved to be a valuable tool to study the hydrodynamics and sediment transport pathways in estuarine and coastal areas. Results indicate that the natural Patos Lagoon coastal plume was observed under the predominant ebb flows and NE winds, promoting fine sediment entrapment south of the mouth of the lagoon (in front of Cassino Beach). The dispersion plumes in the disposal sites responded to the wind intensity and direction and did not present any transport tendency towards Cassino Beach. Part of the dredged sediment disposed of in the proposed alternative sites located in deeper areas (Sites B and C) left the site and was transported parallel to the coast (SW–NE direction) according to the wind direction (NE–SW). The area where the disposal sites were located took around 4 days to recover from the dredging operation and reach the usual suspended sediment concentrations and the actual Port of Rio Grande Licensed Site for dredged material proved to be the best alternative among the investigated options. View Full-Text
Keywords: ports; estuaries; dredging; dredged sediment; dispersion plume; disposal site ports; estuaries; dredging; dredged sediment; dispersion plume; disposal site
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MDPI and ACS Style

Fernandes, E.H.; da Silva, P.D.; Gonçalves, G.A.; Möller, O.O., Jr. Dispersion Plumes in Open Ocean Disposal Sites of Dredged Sediment. Water 2021, 13, 808. https://doi.org/10.3390/w13060808

AMA Style

Fernandes EH, da Silva PD, Gonçalves GA, Möller OO Jr.. Dispersion Plumes in Open Ocean Disposal Sites of Dredged Sediment. Water. 2021; 13(6):808. https://doi.org/10.3390/w13060808

Chicago/Turabian Style

Fernandes, Elisa H.; da Silva, Pablo D.; Gonçalves, Glauber A.; Möller, Osmar O., Jr. 2021. "Dispersion Plumes in Open Ocean Disposal Sites of Dredged Sediment" Water 13, no. 6: 808. https://doi.org/10.3390/w13060808

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