Hydrographic characterization of an estuarine tidal channel

Vaz, Nuno; Dias, João Miguel

doi:10.1016/j.jmarsys.2007.05.002

Cited by 46 publications

(39 citation statements)

References 22 publications

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“…These data reveal high environmental stress for foraminifera leading to a prevalence of high species dominance in the area. Several kinds of stressors, including current velocities (described by Vaz and Dias, 2008;Dias et al, 2003Dias et al, , 2000Dias et al, , 1999) that cause sediment remobiliza-al sites are dominated by A. tepida and H. germanica. Q. seminulum is spread over many lagoonal areas influenced by tides.…”

Section: Discussionmentioning

confidence: 99%

“…One of the most problematic factors affecting the abundance of foraminifera in Ria de Aveiro is current velocity. In many places of the deepest navigable channels near the lagoon mouth, where the current velocity is too strong (higher than 2m/s, according to Dias, 2008 andDias et al, 2000) and causes great instability of the substrate, living foraminifers are rare. On the other hand, weak currents allow the deposition of fine-grained sediments in other areas, creating high-sedimentation environments, like at the beginning of the Mira Channel.…”

Section: Discussionmentioning

confidence: 99%

“…Tides are semidiurnal and are present in the entire lagoon. The tidal current velocities near the entrance can be higher than 2 m/s (Vaz and Dias, 2008;Dias et al, 2000), but they are weak in many of the innermost small canals and mudflats. Winds affect both the hydro-dynamical regime and the mixing processes in the lagoon by generating surface shear stress and waves .…”

Section: Introductionmentioning

confidence: 99%

“…The main rivers are the Vouga (~50 m 3 /s average discharge) and the Antuã (~5 m 3 /s) (Moreira et al, 1993). The river influence is higher in the upper and inner parts of the lagoon (Vaz and Dias, 2008).…”

Section: Introductionmentioning

confidence: 99%

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The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

Martins

Yamashita

Sousa

et al. 2011

Journal of Iberian Geology

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This work evaluates the quality of the sediment in Ria de Aveiro, a coastal lagoon located at N of Portugal that is under strong anthropic influence, and the effects of the contamination on benthic foraminifera. The initial approach for measuring pollution was done through the load pollution index (LPI), based on As, Cd, Cr, Cu, Ni, Pb and Zn concentrations, and determined by total digestion of the sediments (TDS). This information was complemented by conducting a metal fractionation technique (sequential chemical extraction -SCE) in some of the most contaminated samples in order to define the relevance of different metal bearingphases (exchangeable cations adsorbed by clay and co-precipitated with carbonates, absorbed by organic matter and retained in the mineralogical phase) and to evaluate the toxic heavy metal availability. Multivariable statistical analyses were carried out taking into consideration the geochemical results, as well as the biotic (percentage of species/groups of species; foraminifer abundance and diversity) and abiotic variables, such as sediment content in mud, total organic carbon (TOC) and Eh.SCE results show that most of the element concentration in the sediments is retained in the resistant mineralogical phase. However, the higher bioavailability of some toxic elements, such as As, Cd, Cu, Hg, Ni, Pb and Zn, found in Laranjo Bay, Aveiro City, Aveiro Harbours and Espinheiro Channel, have a generic negative impact on benthic foraminifera of the Aveiro lagoon. Differential sensitivity of benthic foraminifera to high concentrations of heavy metals may exist. Quinqueloculina seminulum, for instance, seems to be more tolerant to higher bioavailable concentrations of Pb and Cu than Ammonia tepida or Haynesina germanica. Both

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

Martins

Yamashita

Sousa

et al. 2011

Journal of Iberian Geology

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“…Besides the river flows, which influence the physical dynamics in the Aveiro Lagoon, in particular salinity and water temperature, the water circulation is mainly driven by tidal forcing (Dias et al, 2000a;Vaz & Dias, 2008). Tides are semi-diurnal, ranging, at the ocean boundary, from 0.6 m at neap tide to 3.2 m at spring tide, with an average amplitude of 2 m (IH, 2014).…”

Section: Hydrological Regimementioning

confidence: 99%

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Lillebø¹,

Stålnacke²,

Gooch³

2015

wio

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Sensitivity analysis of a morphodynamic modelling system applied to a coastal lagoon inlet

et al. 2010

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This work investigates the recent morphological changes at the inlet of a complex coastal system (Ria de Aveiro lagoon, Portugal). This study was carried out using bathymetric data analysis and numerical simulations obtained with the 2DH morphodynamic modelling system MORSYS2D. The present simulations considered only tidal forcing, and a sensitivity analysis was performed by tuning the formula used to compute the sediment transports. A non-uniform sediment grain size distribution for the Ria de Aveiro inlet is considered in the numerical simulations, based on surveys performed in this area. The model results are analysed to assess if they resemble the observed trends of erosion and deposition, as calculated from bathymetric data. A quantitative analysis of the differences between the bathymetric changes obtained through surveys and the numerical results over a period of 3 years considering different sediment transport formulations shows that the formulations of Ackers and White (1973) and Engelund and Hansen (1967) are the ones that best describe the morphodynamic changes driven by tides in the Ria de Aveiro inlet.

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Hydrographic characterization of an estuarine tidal channel

Cited by 46 publications

References 22 publications

The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

The response of benthic foraminifera to pollution and environmental stress in Ria de Aveiro (N Portugal)

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Sensitivity analysis of a morphodynamic modelling system applied to a coastal lagoon inlet

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