The influence of river discharge and wind on Patos Lagoon, Brazil, Suspended Particulate Matter

Távora, Juliana; Fernandes, Elisa Helena Leão; Thomas, Andrew C.; Weatherbee, Ryan; Schettini, Carlos Augusto França

doi:10.1080/01431161.2019.1569279

Cited by 27 publications

(26 citation statements)

References 57 publications

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“…Similar trends with lower values in winter (TSS = 5-10 mg L −1 ) and higher in summer (TSS = 20-35 mg L −1 ) were found in the similar Vistula and Szczecin lagoons [13,65]. In comparison with the biggest lagoon in the world-the Patos Lagoon in Brazil-where the freshwater and wind are the main drivers, the TSS values variy from 50 until 150 mg L −1 (in the article called as Suspended Particulate Matter, g m −3 ) with the recorded maximum of 1000 mg L −1 [66]. In the Patos Lagoon, a strong interannual variability of TSS was found, with the highest concentrations in austral spring and summer and the lowest in autumn and winter.…”

Section: In Situ Data and Sediment Rating Curvementioning

confidence: 93%

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

Mėžinė

Ferrarin

Vaičiūtė

et al. 2019

Water

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The aim of this study was to investigate the sediment dynamics in the largest lagoon in Europe (Curonian Lagoon, Lithuania) through the analysis of in situ data and the application of a sediment transport model. This approach allowed to identify the propagation pathway of the riverine suspended sediments, to map erosion-accumulation zones in the lagoon and calculate the sediment budget over a 13-year-long simulation. Sampled suspended sediment concentration data are important for understanding the characteristics of the riverine and lagoon sediments, and show that the suspended organic matter plays a crucial role on the sediment dynamics for this coastal system. The numerical experiments carried out to study sediment dynamics gave satisfactory results and the possibility to get a holistic view of the system. The applied sediment transport model with a new formula for settling velocity was used to estimate the patterns of the suspended sediments and the seasonal and spatial sediment distribution in the whole river–lagoon–sea system. The numerical model also allowed understanding the sensitivity of the system to strong wind events and the presence of ice. The results reveal that during extreme storm events, more than 11.4 × 106 kg of sediments are washed out of the system. Scenarios without ice cover indicate that the lagoon would have much higher suspended sediment concentrations in the winter season comparing with the present situation with ice. The results of an analysis of a long-term (13 years) simulation demonstrate that on average, 62% of the riverine sediments are trapped inside the lagoon, with a marked spatially varying distribution of accumulation zones.

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Section: In Situ Data and Sediment Rating Curvementioning

confidence: 93%

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

Mėžinė

Ferrarin

Vaičiūtė

et al. 2019

Water

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“…MODIS is well suited for time series analysis despite the potential sensor drift and/or increased noise associated with its extended time in orbit. MODIS has been used for time series analysis in estuaries, lakes, and coastal waters such as, to name just a few: the Columbia River Estuary (Hudson et al, 2017), the coastal waters of the northern Gulf of Mexico (Reisinger et al, 2017), the Patos Lagoon in Brazil (Tavora et al, 2019), fjords in Svalbard (Payne & Roesler, 2019), coastal waters in the Arctic (Chaves et al, 2015), the Bohai Sea (Shang et al, 2016), and Minnesota lakes (Knight & Voth, 2012). To correct for potential drift, MODIS-Aqua is calibrated onboard regularly using scheduled solar diffuser measurements and lunar observations (Wu et al, 2013).…”

Section: Calculation Of Long-term Trendsmentioning

confidence: 99%

Long‐Term Trends in Chesapeake Bay Remote Sensing Reflectance: Implications for Water Clarity

Turner

Friedrichs

2021

JGR Oceans

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Studying long-term change in water clarity in estuaries is an integral part of assessing improvements from historically polluted conditions. Light availability in estuaries is a critical driver of primary production and ecosystem health, shaping important nursery habitats such as seagrass meadows, coral reefs, and oyster reefs. Low water clarity is often concurrent with pathogens and harmful algal blooms, impacting fisheries and human health. Some of the world's estuaries have experienced widespread eutrophication and degraded water clarity, such as the Ches-

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“…This important depositional basin receives SPM from three main tributaries Guaíba and Camaquã rivers, and the São Gonçalo Channel (SGC), which connects Patos and Mirim Lagoons, which together cover 14,000 km 2 (Bortolin et al, 2020). Once inside the lagoon, the coarser fractions of suspended sediment tend to deposit in the upper course of the system and the SPM fine fraction is either transported in suspension or deposited in preferential zones, responding to autogenic forcings (Bortolin et al, 2020), such as the variability in freshwater discharges and wind action (Távora et al, 2019;Bitencourt et al, 2020). The fine SPM fraction which reaches Patos Lagoon estuary moves towards the coast through Rio Grande Channel, which has predominant ebb flow (Moller et al, 2001;Fernandes et al, 2002), but is also subject to flocculation processes during flood flows (Ávila et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…The mean annual freshwater discharge in Patos Lagoon is about 2,400 m 3 .s −1 (Vaz et al, 2006), however, such conditions change according to ENSO events (Fernandes et al, 2002), with lower inflows during La Niña events, contrasting with peaks reaching 12,000 m 3 .s −1 during El Niño events (Moller et al, 1996). These driving forces behave according to wellstudied cycles, whose periods are recognized in seasonal and interannual scales (Vaz et al, 2006;Jung et al, 2020), as well as El Niño-Southern Oscillation (ENSO) (Vaz et al, 2006;Távora et al, 2019Távora et al, , 2020bBitencourt et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The freshwater inputs from the tributaries are assumed as the main control in SPM concentrations in Patos Lagoon during long time scales (seasonal and interannual), with high SPM concentrations proportional to peaks in freshwater discharges related to the ENSO cycle (Moller et al, 2001;Távora et al, 2019Távora et al, , 2020bBitencourt et al, 2020). A recent study has proposed the prediction of SPM concentrations by the tributaries of Patos Lagoon in short time scales, based on the time series of freshwater discharge from the tributaries and the rating-curves approach (Jung et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Variability on Suspended Particulate Matter Loads From the Tributaries of the World’s Largest Choked Lagoon

2022

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Continental freshwater contributions are the main long-term control on the variability of suspended particulate matter (SPM) concentrations in choked lagoons. The current work aims to assess the seasonal to interdecadal variability in SPM concentrations from Patos Lagoon tributaries, as a case study towards the understanding of tributaries contributions to coastal lagoons. Thus, an interdecadal dataset (1984–2020) was collected in the region of the tributaries of Patos Lagoon (southern Brazil), integrating Landsat series (653 scenes) and in situ measurements. SPM concentrations were estimated from the scenes using a semi-analytical multiwavelength algorithm, applied in the regions of the lower course of the tributaries. Results identified SPM concentrations variability in seasonal scales, enhanced by El Niño Southern Oscillation (ENSO) in interannual time scales, also influencing in interdecadal trends. The seasonal SPM concentration variability reached 50 g.m–3 to each tributary. Higher SPM concentration values occurred from winter to spring, enhanced during El Niño periods and frequently reaching annual means higher than 100 g.m–3. Periods from summer to autumn, however, presented lower SPM concentrations, especially during La Niña periods, when the mean annual SPM concentration remained mostly below 50 g.m–3. Seasonal and interannual (ENSO) forcings combined developed configurations of high input periods (HIP) and low input periods (LIP). During the LIP, the river plumes are limited to their tributary zone of influence and the whole lagoon has reduced SPM concentrations. During the HIP, the river plumes spread over the lagoon sub-environments, and the SPM concentrations of all tributaries reach the estuarine zone and the ocean. Thus, the mentioned natural phenomena influence the river plumes spreading, the SPM concentrations in the lagoon, and the export to the Atlantic Ocean in time scales varying from seasonal to interdecadal.

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The influence of river discharge and wind on Patos Lagoon, Brazil, Suspended Particulate Matter

Cited by 27 publications

References 57 publications

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

Long‐Term Trends in Chesapeake Bay Remote Sensing Reflectance: Implications for Water Clarity

Long-Term Variability on Suspended Particulate Matter Loads From the Tributaries of the World’s Largest Choked Lagoon

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