scholarly journals Influence of the Freshwater Discharge on the Hydrodynamics of Patos Lagoon, Brazil

2014 ◽  
Vol 05 (09) ◽  
pp. 925-942 ◽  
Author(s):  
Gustavo Pessoa de Barros ◽  
Wiliam Correa Marques ◽  
Eduardo de Paula Kirinus
Keyword(s):  
Freshwater Discharge ◽  
Patos Lagoon

scholarly journals Long-Term Temporal Variability of the Freshwater Discharge and Water Levels at Patos Lagoon, Rio Grande do Sul, Brazil

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
G. P. Barros ◽  
W. C. Marques
Keyword(s):  
Ocean Circulation ◽  
Temporal Variability ◽  
Water Levels ◽  
Freshwater Discharge ◽  
Patos Lagoon ◽  
Mean Values ◽  
Physical Forcing ◽  
The Mean ◽  
One Year

The aim of this study is to investigate the importance of freshwater discharge as a physical forcing in Patos Lagoon at timescales longer than one year, as well as identify the temporal variability of the dominant processes in freshwater discharge and water levels along the Patos Lagoon. Due to its proximity to the mouth, the water level at the estuary is influenced by the remote effects associated with the adjacent ocean circulation and wave climatology, reducing the observed correlation. At the lagoonar region a high correlation is expected because interannual data is being used, reducing the influence of the wind. Cross wavelet technique is applied to examine the coherence and phase between interannual time-series (South Oscillation Index, freshwater discharge and water levels). The freshwater discharge of the main tributaries and water levels in Patos Lagoon are influenced by ENSO on interannual scales (cycles between 3.8 and 6 years). Therefore, El Niño events are associated with high mean values of freshwater discharge and water levels above the mean. On the other hand, La Niña events are associated with low mean values of freshwater discharge and water levels below the mean.

scholarly journals Relationships between Wind Effect, Hydrodynamics and Water Level in the World's Largest Coastal Lagoonal System

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2209 ◽  
Author(s):  
Oliveira ◽  
Fernandes ◽  
Möller ◽  
García-Rodríguez
Keyword(s):  
Water Levels ◽  
Freshwater Discharge ◽  
Economic Losses ◽  
Wind Effect ◽  
Southern Brazil ◽  
Cell Orientation ◽  
Patos Lagoon ◽  
Adverse Conditions ◽  
The World ◽  
One Year

The Patos-Mirim is the largest coastal limnological system of the world, located in southern Brazil and eastern Uruguay, which encompass over 500 km of coastline. The economical demand for the development of an international waterway brings the need for understanding the Mirim lagoon dynamics and ulterior discharge into Patos lagoon in view of establishing navigation conditions and sustainable development. In this sense, circulation and freshwater discharge dynamics were assessed by running the numerical model TELEMAC-3D for a one-year-long simulation. The model identified the wind direction and intensity as the main combined forcing modulating water circulation and transport between the northern and southern portions and conditioning the recirculation cell orientation. Predominant winds from the S-SW directions could generate adverse conditions for navigation because they would yield low water levels under northwards water transport, thus creating shallow regions for navigation. Under such conditions, the high freshwater discharge coming from the Mirim lagoon would be restricted, and the communication to the Patos lagoon would be sufficiently weakened to prevent navigation activities. Therefore, we recommend that the viability of planning and implementing an international waterway, involving the two countries (Brazil and Uruguay), must take into account wind conditions prior to setting navigation traffic and avoid economic losses.

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

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 646
Author(s):  
Rafael André Ávila ◽  
Priscila Mulattieri Suarez Orozco ◽  
Mauro Michelena Andrade ◽  
Osmar Olinto Möller
Keyword(s):  
Temporal Variability ◽  
Suspended Solids ◽  
Southern Brazil ◽  
Patos Lagoon ◽  
Reliable Technique ◽  
Acoustic Data ◽  
Solids Concentration ◽  
Estuarine Hydrodynamics ◽  
Inflow Conditions

The assessment of suspended-solids dynamics is crucial for the effective monitoring of estuarine environments. As the recurring in-situ sampling is usually problematic, the calibration of the backscattering from acoustic Doppler profilers has shown to be a reliable technique to estimate the suspended-solids concentration (SSC) in estuaries and rivers. In this study, we obtained a linear model that provides SSC estimates for the estuarine channel of Patos Lagoon by calibrating turbidity and acoustic data with in-situ concentration samples. The model output was analyzed in terms of its relationship with estuarine hydrodynamics and temporal variability. In this estuary, the supply of suspended solids is known to be due the runoff from its main tributaries, but also through the exchanges between the estuary and the coastal ocean. Both sources provide sediments and organic solids which affect water quality, geomorphology, and harbor operations. Results show that SSC is strongly linked to estuarine hydrodynamics, where concentrations increase with streamflow. During outflow periods, higher concentrations are associated with river runoff, whereas with inflow conditions they are induced by southern and southwesterly winds. However, relationship between SSC and streamflow is asymmetrical, meaning that the largest concentrations are majorly linked to outflow currents and downstream transport.

scholarly journals Estimation of freshwater discharge from the Kamchatka Peninsula to its surrounding oceans

2021 ◽  
Vol 36 ◽  
pp. 100836
Author(s):  
Muqing Shi ◽  
Takayuki Shiraiwa ◽  
Humio Mitsudera ◽  
Yaroslav Muravyev
Keyword(s):  
Kamchatka Peninsula ◽  
Freshwater Discharge

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

2017 ◽  
Vol 13 (1) ◽  
pp. 3-8 ◽  
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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