scholarly journals Circulation and suspended particulate matter transport in a tidally dominated estuary: caravelas estuary, Bahia, Brazil

2010 ◽  
Vol 58 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Carlos Augusto França Schettini ◽  
Luiz Bruner de Miranda
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
High Tide ◽  
Spring Tide ◽  
Mixed Volume ◽  
Volume Transport ◽  
Tidal Variation ◽  
Salinity Stratification ◽  
Suspended Particulate ◽  
Matter Transport

The circulation and transport of suspended particulate matter in the Caravelas Estuary are assessed. Nearly-synoptic hourly hydrographic, current (ADCP velocity and volume transport) and suspended particulate matter data were collected during a full semidiurnal spring tide, on the two transects Boca do Tomba and Barra Velha and on longitudinal sections at low and high tide. On the first transect the peak ebb currents (-1.5 ms-1) were almost twice as strong as those of the wider and shallow Barra Velha inlet (-0.80 ms-1) and the peak flood currents were 0.75 and 0.60 ms-1, respectively. Due to the strong tidal currents both inlets had weak vertical salinity stratification and were classified with the Stratification-circulation Diagram as Type 2a (partially mixed-weakly stratified) and Type 1a (well mixed). Volume transports were very close, ranging from -3,500 to 3,100 m³s-1 at the ebb and flood, respectively, with a residual -630 m³s-1. The concentration of the suspended particulate matter was closely related to the tidal variation and decreased landwards from 50 mg.L-1 at the estuary mouth, to 10 mg.L-1 at distances of 9 and 16 km for the low and high tide experiments, respectively. The total residual SPM transport was out of the estuary at rates of -18 tons per tidal cycle.

The influence of contrasting suspended particulate matter transport regimes on the bias and precision of flux estimates

2006 ◽  
Vol 370 (2-3) ◽  
pp. 515-531 ◽  
Author(s):  
Florentina Moatar ◽  
Gwenaelle Person ◽  
Michel Meybeck ◽  
Alexandra Coynel ◽  
Henri Etcheber ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Suspended Particulate ◽  
Matter Transport

Antimony in the Lot–Garonne river system: a 14-year record of solid–liquid partitioning and fluxes

2018 ◽  
Vol 15 (3) ◽  
pp. 121 ◽  
Author(s):  
Teba Gil-Díaz ◽  
Jörg Schäfer ◽  
Alexandra Coynel ◽  
Cécile Bossy ◽  
Lionel Dutruch ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Water Discharge ◽  
River System ◽  
Gironde Estuary ◽  
River Watershed ◽  
Suspended Particulate ◽  
Matter Transport ◽  
Garonne River ◽  
Solid Liquid

Environmental contextAntimony is a trace element ubiquitously present in the environment, but data are lacking on its spatio-temporal distribution in aquatic environments. Long-term records serve as essential tools to decipher temporal patterns, historical sources and sinks and background concentrations in an area. We characterise the temporal concentrations, transport and behaviour of antimony in the Garonne River watershed, the main tributary to the Gironde Estuary, the largest estuary in south-west Europe. AbstractKnowledge of the environmental chemistry of antimony (Sb) in aquatic systems is limited, and a better understanding of its geochemical behaviour is needed. Based on a fourteen-year survey (2003–2016) with monthly measurements of dissolved and particulate Sb at five sites in the Lot–Garonne river system, combined with daily measurements of water discharge and suspended particulate matter, this work characterises Sb behaviour in the upstream major river watershed of the Gironde Estuary. The survey provides a first regional geochemical Sb background in the Garonne River watershed for dissolved (~0.2 µg L−1) and Th-normalised particulate Sb (Sbp/Thp ~0.25) concentrations. Observed decreasing temporal trends (<1 ng L−1 in dissolved and <0.02 mg kg−1 in particulate concentrations per month) at sites representing natural concentrations probably reflect global atmospheric Sb dynamics at the watershed scale. Regular seasonal cycles of solid/liquid partitioning, with higher solubility in summer (matching high dissolved and low particulate concentrations), reflect water-discharge and suspended particulate matter transport dynamics and possibly seasonal (bio)geochemical processes. Furthermore, this coefficient decreases from the river to the estuarine reaches (from average log10Kd 4.3 to minimum 3.7 L kg−1), suggesting an increased solubility of Sb in estuarine systems. Flux estimates indicate the relevance of the dissolved fraction in Sb transport (with negligible influence of the colloidal fraction) and a total flux (dissolved + particulate) entering the Gironde Estuary of 5.66 ± 2.96 t year−1 (~50 % particulate). These results highlight the importance of timescales and environmental parameters for understanding and prediction of future Sb biogeochemistry.

scholarly journals Depth dependence and intra-tidal variability of Suspended Particulate Matter transport in the East Anglian plume

2017 ◽  
Vol 127 ◽  
pp. 2-11 ◽  
Author(s):  
Meinard C.H. Tiessen ◽  
Marieke A. Eleveld ◽  
Janine J. Nauw ◽  
Bouchra Nechad ◽  
Theo Gerkema
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Depth Dependence ◽  
Suspended Particulate ◽  
Matter Transport ◽  
Tidal Variability

scholarly journals Observations of Suspended Particulate Matter Concentrations and Particle Size Distributions within a Macrotidal Estuary (Port Curtis Estuary, Australia)

2021 ◽  
Vol 9 (12) ◽  
pp. 1385
Author(s):  
Ryan J. K. Dunn ◽  
Jordan Glen ◽  
Hsin-Hui Lin ◽  
Sasha Zigic
Keyword(s):  
Particle Size ◽  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Neap Tide ◽  
Spring Tide ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Size Classes ◽  
Macrotidal Estuary ◽  
Suspended Particulate

An understanding of suspended particulate matter (SPM) dynamics is of great importance to design awareness and management strategies of estuaries. Using a Laser In Situ Scattering and Transmissiometry (LISST) instrument, variations in suspended particle size volumetric concentrations (VC) and particle size distributions (PSD) were measured at six sites within Port Curtis estuary (Australia). The port is a macrotidal estuary with significant economic and environmental importance. Observed VC and SPM sizes demonstrated spatial and temporal trends strongly controlled by the variable energy conditions operating on the neap and spring cycle timescale, with a clear trend towards increasing concentrations and decreasing SPM sizes with increasing tidal ranges. Mid-estuary sites were characterized by the greatest depth-averaged VC under transitional and spring conditions. Estuary-wide mean spring tide total water profile concentrations revealed a near 300% increase in comparison to neap tide condition concentrations. In the upper-estuary sites the mean contribution of the combined 2.5–35 µm size classes to the total profile PSDs was greatest during all tidal conditions, whilst within the lower-estuary site the combined 35–130 µm size classes were greatest. Mean contributions of the largest size class (300–500 µm) dominated surface-waters throughout the estuary during the neap tide period, which when compared with the transitional and spring tide conditions, demonstrated changes of −82% to −48% and −82% to −40%, respectively. Overall, the results from this case study provides further evidence of the important influence of neap and spring tidal regimes on SPM dynamics within estuarine settings and the need to observe parameter dynamics on such timescales.

Suspended particulate matter transport through the Vema Channel

1987 ◽  
Vol 77 (3-4) ◽  
pp. 171-184 ◽  
Author(s):  
M.J Richardson ◽  
P.E Biscaye ◽  
W.D Gardner ◽  
N.G Hogg
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
Suspended Particulate ◽  
Matter Transport
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