The Influence of Sediment Load on Tidal Dynamics, a Case Study: Cádiz Bay

The contents and the distribution of clay minerals in modern sediments of the Cadiz bay and the continental shelf have been studied aiming to establish the sedimentary exchange model and the pathways followed by the clay fraction between the bay and the adjoining continental shelf. The most abundant clay minerals in the muddy sediments consist mainly of illite, smectite, interstratified illite-smectite, kaolinite and chlorite. The application of factor analysis method (PCA) to clay minerals data are considered to be useful in the determination of sedimentary transport patterns. The data from clay mineral assemblages, and their distribution map, make possible to establish the fine sediments transport paths in the study area using clay mineral as natural tracers. This model of transport takes in consideration the facies distribution, the supplies sources and the way of fine sediments are incorporated to the marine environment Two flows paths have been established: the outflows coming from Cadiz bay and the littoral zones; and the inflows coming from external marine zones of the bay. These flows are controlled by tidal currents and the morphology of the coast. The action of surge and the marine currents, specially the Atlantic Surface Water flow, are also important in the transport of fine sediments coming from sources located to the north of the study zone.

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Section: Factor Analysis and Clay Minerals Assemblagessupporting

confidence: 90%

Utility of clay Minerals in the Determination of Sedimentary Transport Patterns in the Bay of Cadiz and the Adjoining Continental Shelf (SW-Spain)

2008

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“…In this zone two bands are observed: one oriented towards the West and NW and the other one toward the SE and the South. These bands might correspond to sea floor marks generated by flows between the bay and the continental shelf; agreement with the tidal flow pattern established by Alvarez et al (1999) in the Cadiz bay. The data from clay minerals contents and assemblages have been used to establish the model of transport paths in different area of the study zone.…”

Section: Mineralssupporting

confidence: 86%

“…These are responsible for the transport of sediments, and the erosion of tidal creeks and salt marsh border, due to the action of small surge that beats riversides, as well as to the effect of collapses and superficial erosion of argillaceous grounds (Achab et al, 2000b). The pattern of particles size distribution is controlled by the action of hydrodynamic agents, the recent eustatic (sea level) changes during the terminal Holocene as well as the coastal and bottoms physiography (Alvarez et al, 1999;Achab & Gutierrez-Mas 1999a) The mineralogical analysis (Fig.7) shows that quartz is the most abundant terrigenous mineral; its content is variable, based on the distribution of different grain sized facies, representing an average content of 55%, with maxima of up to 80% in sandy area, while in muddy sands the content is less than 25%. Feldspars are sparse; the content ranges from 5 to 10%, indicating a high degree of compositional maturity of the sediment.…”

Section: Facies Distribution Patternmentioning

confidence: 99%

Dynamics of Sediments Exchange and Transport in the Bay of Cadiz and the Adjacent Continental Shelf (SW - Spain)

Achab¹

2011

Sediment Transport in Aquatic Environments

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“…The horizontal structure of equations were integrated on an Arakawa‐C staggered grid by a semi‐implicit Crank‐Nicolson scheme, using the Peaceman and Rachford [1955] splitting‐up method as in the UCA2D model [ Álvarez et al , 1999], while an implicit scheme was used for the vertical diffusion terms in the 3‐D equations [ Richtmyer and Morton , 1967]. This scheme is conservative and unconditionally stable [ Marchuk , 1980], and provides high numerical stability and computational efficiency.…”

Section: Modelmentioning

confidence: 99%

Analysis of short-period internal waves using wave-induced surface displacement: A three-dimensional model approach in Algeciras Bay and the Strait of Gibraltar

Álvarez¹,

González²,

Mañanes³

et al. 2011

J. Geophys. Res.

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[1] A three-dimensional, nonlinear, high-resolution, sigma coordinate, hydrodynamic model was applied to study the sea surface manifestation of short-period internal waves measured in Algeciras Bay and the Strait of Gibraltar. Model results reproduce the tidally induced generation of the internal bore over the Camarinal Sill and its disintegration into wave trains as it moves eastward. While propagating along the Strait of Gibraltar toward the Mediterranean Sea, the wave trains partly penetrate into Algeciras Bay, with typical oscillation periods of 20 and 40 min. The modeled wave-induced surface train structures are compared with satellite images and in situ observational data obtained from two pressure sensors located inside the bay. Results demonstrate that wave-induced sea surface displacements are indicators of the presence of internal waves and may be used in the context of the internal wave analysis when surface oscillations are captured with sufficient precision.Citation: Álvarez, Ó., C. J. González, R. Mañanes, L. López, M. Bruno, A. Izquierdo, J. Gómez-Enri, and M. Forero (2011), Analysis of short-period internal waves using wave-induced surface displacement: A three-dimensional model approach in

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The Influence of Sediment Load on Tidal Dynamics, a Case Study: Cádiz Bay

Cited by 53 publications

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Utility of clay Minerals in the Determination of Sedimentary Transport Patterns in the Bay of Cadiz and the Adjoining Continental Shelf (SW-Spain)

Utility of clay Minerals in the Determination of Sedimentary Transport Patterns in the Bay of Cadiz and the Adjoining Continental Shelf (SW-Spain)

Dynamics of Sediments Exchange and Transport in the Bay of Cadiz and the Adjacent Continental Shelf (SW - Spain)

Analysis of short-period internal waves using wave-induced surface displacement: A three-dimensional model approach in Algeciras Bay and the Strait of Gibraltar

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