MID TERM SIMULATION OF SUSPENDED SEDIMENT TRANSPORT AND BED EVOLUTION FOR THE PATOS LAGOON ESTUARY

Worldwide harbors are settled inside estuarine areas due the protection function of these environments against oceanic waves and therefore are subjected to the hydrodynamic processes that provide morphodynamic changes in sediment distribution and bed evolution. Understanding the dynamic of sediments and the bed evolution at estuaries is of crucial importance on maintenance of fairways and harbor docks. We modeled using the finite element technique 1005 days of hydro and morphodynamic of the Patos Lagoon estuary, in order to identify the critical deposition areas inside the Rio grande harbor fairway. Therefore, a hydrodynamic model, TELEMAC 3D, and a morphodynamic, Sisyphe, were applied in order to acquire the bed evolution and sediment distribution of the area using different data sources for the oceanic, atmospherical and continental boundary conditions. The results, present that clay is being deposited at deeper parts of the channel. Bed evolution results indicate siltation/erosion process where silt/clay is being deposited. Sedimentation rates were calculated based on the bed evolution results as well. The validation procedure showed good representation by the models of the physical aspects of the environment.

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Biota of the Patos Lagoon estuary and adjacent marine coast: long-term changes induced by natural and human-related factors

Marine Biology Research ◽

10.1080/17451000.2016.1258714 ◽

2017 ◽

Vol 13 (1) ◽

pp. 3-8 ◽

Cited By ~ 8

Author(s):

Clarisse Odebrecht ◽

Eduardo Resende Secchi ◽

Paulo Cesar Abreu ◽

José Henrique Muelbert ◽

Franz Uiblein

Keyword(s):

Related Factors ◽

Patos Lagoon ◽

Long Term Changes ◽

Patos Lagoon Estuary

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Distribution of particulate trace metal in the southern part of the Patos Lagoon estuary

Aquatic Ecosystem Health & Management ◽

10.1080/14634980008650688 ◽

2000 ◽

Vol 3 (4) ◽

pp. 515-520 ◽

Cited By ~ 10

Author(s):

L.F. Niencheski ◽

M.G.Z. Baumgarten

Keyword(s):

Trace Metal ◽

Patos Lagoon ◽

Patos Lagoon Estuary

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Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x10716 ◽

2017 ◽

Vol 29 (0) ◽

Cited By ~ 4

Author(s):

Rafela Neves Marreto ◽

Maria da Graça Zepka Baumgarten ◽

Mônica Wallner-Kersanach

Keyword(s):

Water Flow ◽

Effluent Treatment ◽

Trophic State Index ◽

Patos Lagoon ◽

Nitrogenous Compounds ◽

Hydrological Conditions ◽

Quality Of Waters ◽

Patos Lagoon Estuary ◽

State Index

Abstract: Aim This study aimed to evaluate the Trophic State Index (TSI) at the margin and in the channel of the Patos Lagoon estuary, considering different hydrological conditions. Methods Surface and bottom water samples were collected in three sites in the channel (margin and center) and in two sites at the Saco da Mangueira in different hydrological conditions in 2011. Results Waters at the Saco da Mangueira are very contaminated by phosphate and nitrogenous compounds. The TSI classifies these waters as being hypereutrophic, the consequence of both the release of effluents which were poorly treated and the low water flow in the inlet. Contamination was mild at the margins of the channel, where waters were classified as being eutrophic and mesotrophic. Trophic balance (mesotrophic waters - oligotrophic surface - bottom) was found in the center of the channel as a consequence of strong water flow and dilution of contaminants coming from the margins. Conclusions Spatial variation in the TSI value enabled clear distinction to be observed between the areas at the margins and in the channel, because it reflected the punctual presence of anthropogenic input in the marginal waters, mainly in the Saco da Mangueira. Effluent treatment must be required in order to control severe trophic imbalance in the waters at the margins of the city. Variations of the proposed index are a useful tool to identify sources of phosphate compounds in other aquatic environments.

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