Sediment transport and morphodynamics of the Douro River estuary

Portela, L. I.

doi:10.1007/s00367-007-0091-1

Cited by 23 publications

(13 citation statements)

References 18 publications

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“…Their solutions, which were obtained using two coupled models: one for hydrodynamics and another for sediment transport, revealed maximum current velocities and maximum erosion at the estuarine mouth between the breakwaters. Similar patterns were obtained by Portela [72] and Iglesias et al [14]. Particularly, Iglesias et al [14] implemented two different numerical models for the Douro river to depict the effect of the sand spit in the floods water levels, demonstrating that the new breakwaters configuration and the strengthening of the sand spit will probably produce an increase in high-water levels during flood conditions, with expected severe impacts on the estuary banks.…”

Section: A Portuguese Case Study: Douro and Minho Estuariessupporting

confidence: 63%

“…It flows from the Sierra de Urbion, in Spain, to the Atlantic Ocean, in northern Portugal, ending in an urban estuary surrounded by two major cities: Porto and Vila Nova de Gaia (Figure 1). The Douro is a highly dynamic narrow estuary with torrential regimes that produce strong currents and recurrent severe floods that cause serious damage to the riverine populations and navigation problems [68,72]. Its dynamics is mainly forced by freshwater flows, being very dependent on highly variable natural conditions and on the hydropower production schedule of the Crestuma-Lever dam and of the other 50 national and international river basin dams.…”

Section: A Portuguese Case Study: Douro and Minho Estuariesmentioning

confidence: 99%

“…The bathymetric configuration of the Douro estuary presents an irregular distribution with depths generally varying between 0 and 10 m (Figures 1 and 3). Depths up to 28 m can be found associated with narrower sections, outer bends, and former sites of sediments extraction [72]. At the southern margin of the estuary's mouth lies a wetland (São Paio Bay) and an estuarine sand spit (Cabedelo) that partially obstructs the river mouth, protecting the estuary from the ocean's storm waves.…”

Section: A Portuguese Case Study: Douro and Minho Estuariesmentioning

confidence: 99%

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Numerical Modeling Tools Applied to Estuarine and Coastal Hydrodynamics: A User Perspective

Iglésias¹,

Paulo²,

Pinho³

et al. 2020

Coastal and Marine Environments - Physical Processes and Numerical Modelling

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Estuarine and coastal areas have been intensively studied given their complexity, ecological, and societal value and the importance of their ecosystem services. Estuarine and coastal management must be based on a sound characterization of these areas, which is achievable complementing the comprehensive field measurements with numerical models solutions. Based on a detailed comparison between two close-by, but extremely different, Portuguese estuaries (the Douro and Minho estuaries), this chapter intends to discuss how accurately numerical modeling tools can provide relevant information for a variety of coastal zones. They can be very useful for various applications in the planning and management fields, such as coastal and infrastructures protection, harbor activities, fisheries, tourism, and coastal population safety, thus supporting an effective and integrated estuarine and coastal management, which must consider both the safety of the populations and the sustainability of the marine ecosystems and services. In particular, the capacity of the numerical models to give a detailed characterization of morpho-hydrodynamic processes, as well as assess and predict the effects of anthropogenic interventions, extreme events and climate change effects, are presented.

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Section: A Portuguese Case Study: Douro and Minho Estuariessupporting

confidence: 63%

Section: A Portuguese Case Study: Douro and Minho Estuariesmentioning

confidence: 99%

Section: A Portuguese Case Study: Douro and Minho Estuariesmentioning

confidence: 99%

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Numerical Modeling Tools Applied to Estuarine and Coastal Hydrodynamics: A User Perspective

Iglésias¹,

Paulo²,

Pinho³

et al. 2020

Coastal and Marine Environments - Physical Processes and Numerical Modelling

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“…in British Columbia (Milliman, 1980), Oregon (Boggs andJones, 1976), New England (FitzGerald et al, 2002) or Kennebec (Fenster et al, 2001) but there are also some studies regarding Iberian Peninsula estuaries, i.e. Douro (Portela, 2008) and Guadiana (Garel et al, 2009, Morales et al, 2014. The tidal and fluvial currents are the more energetic dynamic agents, sharply conditioned in this estuary by the outer geometry of the former rocky valley.…”

Section: Hydrodynamic Controls Of Sedimentation: a Morphosedimentary mentioning

confidence: 99%

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

Flor-Blanco

Flor

González

et al. 2016

Journal of Iberian Geology

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The Tina Menor estuary is a highly confined incised valley with advanced sedimentary infilling. The outstanding feature of this estuary is its longitudinal zonation, which forms four segments from the outer to the inner limit: Mouth complex, Bay, Tidal flats and Upper channel. The innermost part of the Bay and the Tidal Flats (semi-reclaimed areas) are broader estuarine zones, whereas the Mouth Complex and outermost Bay are confined by narrow rocky outcrops. This paper explains the dynamics and sedimentary distribution of a highly confined and singular estuary, detailing the fluvial-tidal controls on the variations in water mixing (QF/QT). This estuary is largely of salt wedge type and the dynamics are characterised by recording currents (speed and direction) in the water column during a tidal cycle in a spring tide; this process consists of the tidal waves propagation and their dissipation upstream hypo-synchronously and the mixing of fresh and saline waters.The morphology, dynamics and sedimentary distributions have been integrated to develop a conceptual model that demonstrates the circulation within the estuary. The sinuous geometry of the estuarine valley and the Coriolis Effect detected, play a fundamental role in determining the morphology and sedimentary distribution. Consequently, this study provides an adequate overview of this type of confined mesotidal estuary, quite common in the eastern Atlantic coast.Keywords: estuary, mesotidal, Bay of Biscay, morpho-sedimentary processes Resumen El estuario de Tina Menor es un valle encajado altamente confinado y sedimentariamente en un avanzado estado de colmatación. Se caracteriza por su zonación longitudinal en cuatro segmentos bien diferenciados desde su sector más externo hasta el límite interior: Complejo de Desembocadura, Bahía, Llanuras Mareales y Canal Superior. El interior de la Bahía y las Llanuras Mareales de carácter fangoso (zonas semi-reclamadas) son las más extensas, mientras que el Complejo de Desembocadura y la parte externa de la Bahía, están estrechamente confinadas por afloramientos rocosos. Este trabajo explica la distribución dinámica y sedimentaria de un estuario singular y altamente confinado, detallando los controles fluviales-mareales en la variación de las mezclas de agua (QF/QT). Este estuario es en gran parte del tipo de cuña salina y la dinámica fue caracterizada por las medidas de corrientes (velocidad y dirección) realizadas en la columna de agua durante un ciclo mareal en marea viva; este proceso consiste en la propagación de las ondas de marea y su disipación de aguas arriba hiposincrónicamente y la mezcla de aguas dulces y salinas.La morfología, dinámica y las distribuciones sedimentarias, se han integrado para desarrollar un modelo conceptual que demuestre la circulación dentro del estuario. La geometría sinuosa del valle estuarino y la detección del efecto de Coriolis, juegan un rol fundamental para determinar la distribución morfologica y sedimentaria. Consecuentemente, este estudio proporciona un visión adecuada de...

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“…The local tides have a semi diurnal regime, with coastal amplitudes ranging between 1 and 1.7 m (Benavent et al, 2009). The waves present a strongly seasonal behavior and main directions from westnorthwest and west (Portela, 2008). Significant wave heights vary between 1 and 3 m, with periods below 10 s during summer, and about 5-6 m with periods around 13 s during winter storms.…”

Section: Regional Relevance and Specificitiesmentioning

confidence: 99%

The Importance of Marine Observatories and of RAIA in Particular

2016

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Coastal and Oceanic Observatories are important tools to provide information on ocean state, phenomena, and processes. They meet the need for a better understanding of coastal and ocean dynamics, revealing regional characteristics, and vulnerabilities. These observatories are extremely useful to guide human actions in response to natural events and potential climate change impacts, anticipating the occurrence of extreme weather and oceanic events and helping to minimize consequent personal and material damages and costs. International organizations and local governments have shown an increasing interest in operational oceanography and coastal, marine and oceanic observations, which resulted in substantial investments in these areas. A variety of physical, chemical and biological data have been collected to better understand the specific characteristics of each ocean area and its importance in the global context. Also the general public's interest in marine issues and observatories has been raised, mainly in relation to vulnerability, sustainability and climate change issues. Data and products obtained by an observatory are hence useful to a broad range of stakeholders, from national and local authorities to the population in general. An introduction to Ocean Observatories, including their national and regional importance, and a brief analysis of the societal interest in these observatories and related issues are presented. The potential of a Coastal and Ocean Observatory is then demonstrated using the RAIA observatory as example. This modern and comprehensive observatory is dedicated to improve operational oceanography, technology, and marine science for the North Western Iberian coast, and to provide services to a large range of stakeholders.

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Sediment transport and morphodynamics of the Douro River estuary

Cited by 23 publications

References 18 publications

Numerical Modeling Tools Applied to Estuarine and Coastal Hydrodynamics: A User Perspective

Numerical Modeling Tools Applied to Estuarine and Coastal Hydrodynamics: A User Perspective

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

The Importance of Marine Observatories and of RAIA in Particular

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