Tagus estuary and Ria de Aveiro salt marsh dynamics and the impact of sea level rise

Valentim, Juliana; Vaz, Nuno; Silva, Helena; Duarte, Bernardo; Caçador, Isabel; Dias, João Miguel

doi:10.1016/j.ecss.2013.04.005

Cited by 40 publications

(28 citation statements)

References 53 publications

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“…The tidal features and propagation within Ria de Aveiro lagoon for the present mean sea level were previously studied by several authors (Dias et al, 2000;Dias, 2001;Araújo, 2005;Lopes et al, 2006;Oliveira et al, 2006;Araújo et al, 2008;Picado et al, 2010;Lopes et al, 2011;Valentim et al, 2013). The patterns of amplitude and phase obtained in this study are similar to those obtained by these authors.…”

Section: Resultssupporting

confidence: 79%

“…to the ocean. The residual circulation on Ria de Aveiro lagoon was studied previously by Dias (2001), Lopes and Dias (2007) and Valentim et al (2013). The first two studies assessed residual currents averaging tidal currents over a M 2 tidal cycle, and obtained similar residual patterns.…”

Section: Resultsmentioning

confidence: 99%

“…The first two studies assessed residual currents averaging tidal currents over a M 2 tidal cycle, and obtained similar residual patterns. The Valentim et al (2013) study, investigated the influence of the mean sea level rise on residual currents in a small salt marsh located at the entrance of Mira channel. They found that residual currents direction remains unchangeable, while its intensity tends to decrease with the mean sea level rise in this salt marsh.…”

Section: Resultsmentioning

confidence: 99%

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Influence of mean sea level rise on tidal dynamics of the Ria de Aveiro lagoon, Portugal

Lopes

Dias

2014

Journal of Coastal Research

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Influence of mean sea level rise on tidal dynamics of the Ria de Aveiro lagoon, Portugal

Lopes

Dias

2014

Journal of Coastal Research

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“…LOI is a straightforward and widely used method to estimate organic matter in the SPM and sediments of marine and freshwater systems (e.g Valentim et al, 2013;. Zhang et al, 2014).…”

mentioning

confidence: 99%

“…Zhang et al, 2014). Using the LOI method,Valentim et al (2013) estimated the organic contents of Tagus Estuary and Ria de Aveiro salt marshes to lie between approx. 10 -24% by dried weight of sediment; Rogers et al (2013) measured soil organic carbon in the Ganges-Brahmaputra plain tidal delta plain in the range 0.4 -3.8%; and Dunn et al (2013) measured sediment organic matter content in a tidal creek, which increased from 5.8 % at a site close to the creek mouth to 8.0% at the most up-estuary site.…”

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confidence: 99%

Estuaries of southwest England: Salinity, suspended particulate matter, loss-on-ignition and morphology

Uncles

Stephens

Harris

2015

Progress in Oceanography

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Assessing salt marsh loss and degradation by combining long‐term LANDSAT imagery and numerical modelling

et al. 2021

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The precise evaluation of the conservation status of salt marshes, the understanding of the mechanisms behind loss and degradation and the anticipation of future threats are fundamental to assist management solutions able to reverse the declining trend observed in these environments. Previous methods combining remote sensing and hydrodynamic modelling have been revealed to be effective in assessing degradation in restricted marshes, but unable to characterise dynamics of marshes at the estuarine scale. This study proposes an alternative methodology to identify priority areas for conservation by combining LANDSAT satellite remote sensing and numerical modelling. Using the Ria de Aveiro as case-study, the main objectives of this work are to: (1) identify vegetation loss and degradation in estuarine marshes; (2) determine the mechanisms behind marsh deterioration; (3) anticipate future threats posed by climate-induced mean sea level rise and; (4) provide management solutions aiming to protect and recover degraded salt marshes. LANDSAT imagery reveals that the most deteriorated salt marshes are located on the central and upper lagoon regions, and the numerical results support that marsh loss and degradation result from the increased tidal action triggered by the deepening of the lagoon channels. The increase in tidal currents promoted the erosion of marsh shoreline, whereas the changes in the inundation patterns over the intertidal areas triggered interior drowning. Climate-induced mean sea level rise will likely exacerbate marsh deterioration, increasing the urgency to implement a management plan aiming to protect marshes from erosion and promote sedimentation in submerged marshes, to ensure their sustainability. K E Y W O R D Smarsh drowning, marsh shoreline erosion, Ria de Aveiro, salt marsh management, tidal dynamics | INTRODUCTIONSalt marshes are considered among the most valuable and productive ecosystems in the world, providing a broad range of services, such as nutrient regeneration, primary production, habitat for marine species and coastal defence (Boorman, 1999). Despite their multiple values, salt marsh area and condition are declining globally, due to growing threats posed by both socioeconomic ('human') and biogeophysical ('natural') actions, exacerbated by climate changes impacts (Mariotti & Carr, 2014). In recognition to their value and to reverse this tendency, management and conservation policies for these habitats have been developed and implemented all over the world; however, these proved to be insufficient in many systems, which continue to degrade (Hansen & Reiss, 2015). Mariotti (2016) summarised three major

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Tagus estuary and Ria de Aveiro salt marsh dynamics and the impact of sea level rise

Cited by 40 publications

References 53 publications

Influence of mean sea level rise on tidal dynamics of the Ria de Aveiro lagoon, Portugal

Influence of mean sea level rise on tidal dynamics of the Ria de Aveiro lagoon, Portugal

Estuaries of southwest England: Salinity, suspended particulate matter, loss-on-ignition and morphology

Assessing salt marsh loss and degradation by combining long‐term LANDSAT imagery and numerical modelling

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