Tidal propagation in Ria de Aveiro Lagoon, Portugal

Dias, João Miguel; Lopes, José Fortes; Dekeyser, Ivan

doi:10.1016/s1464-1909(00)00028-9

Cited by 176 publications

(116 citation statements)

References 3 publications

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“…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). The tidal phase lag, relative to the ocean boundary, is in the order of 6 h in the upper reaches of the channels; whilst the water residence time in the lagoon varies from less than 2 days near the ocean boundary, to more than 1 week in the upstream channels (Dias et al, 2000a). The average depth of the lagoon is 1 m, except in navigation channels where dredging operations are frequently carried out to maintain the depths of about 20 m in the ocean boundary and 7 m in the navigation channels (Dias et al, 2000a).…”

Section: Hydrological Regimementioning

confidence: 99%

“…The Ria Lagoon is part of the Vouga River basin area, and is approximately 45 km long (NNE-SSW) and 10 km wide (Dias et al, 2000a). The lagoon forms a unique mesotidal wetland area, characterized by four main channels with several branches forming islands, inner basins and mudflats.…”

Section: Characterization Of the Ria De Aveiro Lagoonmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Lillebø¹,

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Gooch³

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Section: Hydrological Regimementioning

confidence: 99%

Section: Characterization Of the Ria De Aveiro Lagoonmentioning

confidence: 99%

Section: Hydrological Regimementioning

confidence: 99%

See 1 more Smart Citation

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Lillebø¹,

Stålnacke²,

Gooch³

2015

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“…Despite the fact that rivers have a small contribution in terms of water input, when compared to the tidal prism, they may have a long-term influence in the residual transport (Dias et al 2003). Dias et al (2000) and showed that the tide is strongly distorted as it progresses from the mouth toward the end of each channel of the lagoon, due to the channels geometry and bathymetry. The general characteristics of the tidal wave are those of a damped progressive wave.…”

Section: The Study Areamentioning

confidence: 99%

“…The lagoon has been also studied through numerical modelling. These studies were performed to investigate topics as the tidal propagation in the lagoon (Dias et al 2000), the lagrangian transport of particles ) and studies of sediment particles Dias et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Horizontal patterns of water temperature and salinity in an estuarine tidal channel: Ria de Aveiro

et al. 2005

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This work presents results from two complementary and interconnected approaches to study water temperature and salinity patterns in an estuarine tidal channel. This channel is one of the four main branches of the Ria de Aveiro, a shallow lagoon located in the Northwest coast of the Iberian Peninsula. Longitudinal and cross-sectional fields of water temperature and salinity were determined by spatial interpolation of field measurements. A numerical model (Mohid) was used in a 2D depth-integrated mode in order to compute water temperature and salinity patterns. The main purpose of this work was to determine the horizontal patterns of water temperature and salinity in the study area, evaluating the effects of the main forcing factors. The field results were depth-integrated and compared to numerical model results. These results obtained using extreme tidal and river runoff forcing, are also presented. The field results reveal that, when the river flow is weak, the tidal intrusion is the main forcing mechanism, generating saline and thermal fronts which migrate with the neap/spring tidal cycle. When the river flow increases, the influence of the freshwater extends almost as far as the mouth of the lagoon and vertical stratification is established. Results of numerical modelling reveal that the implemented model reproduces quite well the observed horizontal patterns. The model was also used to study the hydrology of the study area under extreme forcing conditions. When the model is forced with a low river flow (1 m 3 s À1 ) the results confirm that the hydrology is tidally dominated. When the model is forced with a high river flow (1,000 m 3 s À1 ) the hydrology is dominated by freshwater, as would be expected in such an area.

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Long-term monitoring of a mercury contaminated estuary (Ria de Aveiro, Portugal): the effect of weather events and management in mercury transport

et al. 2012

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ABSTRACT:The main aim of this research was to assess the mercury transport from an estuarine basin with a background of anthropogenic contamination during a spring tidal cycle (year 2009) and compare it with two previous tidal cycles (years 1994 and 1999), as part of a long-term monitoring program. Results showed that effective mercury transport occurs both in the dissolved and particulate fractions (0.18 and 0.20 kg per tidal cycle, respectively), and despite an overall decrease in environmental contamination, results more than double previous findings on particulate transport in the system. These findings result essentially from changes in the tidal prism (net export of 2 million m 3 of water), given that both dissolved and particulate concentrations did not increase over time. Hydrodynamic simulations were performed to evaluate the effect of physical disturbance (dredging) and weather events (increased freshwater flow) in these processes, and results suggest the increased freshwater flow into the system as the main forcing function for the mercury transport increment. These results highlight the importance of long-term monitoring programs, since despite an overall improvement in local contamination levels, the enhancement of transport processes through hydrological changes increases environmental pressure away from the contamination source.

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Tidal propagation in Ria de Aveiro Lagoon, Portugal

Cited by 176 publications

References 3 publications

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Coastal Lagoons in Europe: Integrated Water Resource Strategies

Horizontal patterns of water temperature and salinity in an estuarine tidal channel: Ria de Aveiro

Long-term monitoring of a mercury contaminated estuary (Ria de Aveiro, Portugal): the effect of weather events and management in mercury transport

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