Effect of salinity on the settling velocity of fine sediments of a harbour basin

Portela, L. I.; Ramos, Susana; Teixeira, A.

doi:10.2112/si65-201.1

Cited by 50 publications

(29 citation statements)

References 13 publications

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“…Manh et al [23], considering an extended range of grain sizes from 2.5 to 80 µm, evaluated a calibration range of settling velocities between 0.01 and 7 mm¨s´1. Portela et al [71] reported settling velocities increasing by a factor of 6.5 between freshwater conditions (S = 0) and marine conditions (S = 30). In this study, the settling velocity of the cohesive sediments was set to 0.05 mm¨s´1 in fresh water and to 0.325 mm¨s´1 at S = 30.…”

Section: Model Setupmentioning

confidence: 98%

Numerical Simulations of Suspended Sediment Dynamics Due to Seasonal Forcing in the Mekong Coastal Area

Vinh¹,

Ouillon

Thao³

et al. 2016

Water

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Abstract:The Mekong River is ranked as the 8th in terms of water discharge and as the 10th in terms of sediment load in the world. During the last 4500 years, its delta prograded more than 250 km to the south due to a tremendous amount of sediments deposited, and turned from a "tide-dominated" delta into a "wave-and-tide dominated" delta. This study aims at completing our knowledge on the fate of sediments that may be stored in estuarine or coastal systems, or dispersed over the continental shelf and slope. Sediment transport in the Mekong River Delta (MRD) coastal area was studied by numerical simulations using the Delft3D model. The model configuration was calibrated and validated from data collected in situ during 4 periods from 2012 to 2014. Then, 50 scenarios corresponding to different wave conditions (derived from the wave climate) and river discharge values typical of low flow and flood seasons enabled us to quantify the dispersal patterns of fluvial sediments close to the mouths and along the coast. Sediments mostly settled in the estuary and close to the mouths under calm conditions, and suspended sediment with higher concentrations extend further offshore with higher waves. Waves from the Southeast enhanced the concentration all along the MRD coastal zone. Waves from the South and Southwest induced coastal erosion, higher suspended sediment concentrations in front of the southern delta, and a net transport towards the Northeast of the delta. Because of episodes of Southern and Southwestern waves during the low flow season, the net alongshore suspended sediment transport is oriented Northeastward and decreases from the Southwestern part of the coastal zone (~960ˆ10 3 t yr´1) to the Northeastern part (~650ˆ10 3 t yr´1).

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Section: Model Setupmentioning

confidence: 98%

Numerical Simulations of Suspended Sediment Dynamics Due to Seasonal Forcing in the Mekong Coastal Area

Vinh¹,

Ouillon

Thao³

et al. 2016

Water

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“…5). At this site the allochthonous sediment transport (characterized by high Al/Si and K/Si ratios) was decreasing throughout the Holocene which can be related to slightly higher salinities and related flocculation of clay minerals (McCool & Parson, 2004;Portela et al 2013). The early Holocene increase of coastline elevations (around 10-15 m) at the BW2 and ALTA1 sites at the northern coast of Seno Skyring could reflect an increase of the marine water transgression to Seno Skyring which would have hampered clay mineral transport by increased flocculation as discussed above.…”

Section: Holocene Fluctuations In Sediment Transport and Event Deposimentioning

confidence: 94%

“…The faster flocculation process of clay minerals hampers the transport of fine grained sediment components (e.g. McCool & Parson, 2004;Portela et al 2013). …”

Section: Holocene Fluctuations In Sediment Transport and Event Deposimentioning

confidence: 99%

“…Based on sediment core proxies this study intends to reconstruct the timing and degree of the marine transgression which changes in the sediment transport (e.g. clay flocculation; McCool & Parson, 2004;Portela et al 2013). Besides the marine transgression these sediment cores indicate several events (tephra deposition, mass flows, and precipitation events) which had further implication for the aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Late Glacial and Holocene Paleogeographical and Paleoecological Evolution of the Seno Skyring and Otway Fjord Systems in the Magellan Region

Kilian

Baeza

Breuer

et al. 2013

Anales Instituto Patagonia (Chile)

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“…Fijémonos en que se , alude tanto al factor calidad hídrica (salinidad) como a la sedimentación, porque "horrura" es sedimento, lodo, incluyendo su componente biológico algal. Se sabe, efectivamente, que la salinidad favorece la floculación-deposición de las partículas suspendidas (Portela et al, 2013). Por tanto, el temor de la señoría ilicitana no era sólo el posible empeoramiento de la calidad hídrica, con la consiguiente disminución de las poblaciones piscícolas, sino también el incremento de la sedimentación y el posible "zegamiento" del humedal.…”

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El acequia que don Manuel mandó facer: La importancia del conocimiento histórico para la comprensión y gestión del “Sistema de Zonas Húmedas del Sur de Alicante”

Cantarino

2014

Proceedings - Irrigation, Society and Landscape. Tribute to Thomas F. Glick

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Resumen. En un texto del Libro de la Caza de don Juan Manuel (inicios siglo XIV), muy citado en diferentes ámbitos por constituir el primer testimonio de la riqueza faunística del actual Sistema de Zonas Húmedas del Sur de Alicante, se alude a la riqueza cinegética de una acequia mandada construir por su padre, el infante D. Manuel. En la presente comunicación, y sobre la base de una intensiva búsqueda de documentación archivística, reconocimiento del terreno y testimonios orales, exponemos qué era esa acequia del siglo XIII, su importancia para el mantenimiento del actual Parque Natural de las Salinas de Santa Pola a lo largo de los siglos contra las tendencias naturales del medio, sus transformaciones históricas y su pervivencia, en cierto modo, en el sistema actual.Al tiempo, y sobre esta base, se plantea una reflexión sobre la relevancia de conocer el peso que las infraestructuras e intervenciones hidráulicas han tenido en la configuración actual del ecosistema del Sistema de Zonas Húmedas del Sur de Alicante, así como del valor de la conciencia histórica de la población local y la trascendencia que ello debería tener para una más adecuada e integrada gestión de este patrimonio que es a la vez cultural y ecológico.Palabras clave. Albufera de Elche, historia ambiental, azarbe, patrimonio hidráulico.Abstract. In a well-known fragment of the Libro de la Caza (Book of the Hunt) by don Juan Manuel (beginnings 14 c.) a reference is made to a canal (acequia) "ordered to be built by don Manuel". In our present communication, we expose, on the base of an intensive archival research, field work and some local oral sources, what this canal was, its importance for the maintenance through the centuries of the Albufera de Elche (present Nature Park of the Salines of Santa Pola), and its historical transformation until our times.We propose also a reflection on the importance of historical knowledge for the understanding of the origins and functionalism of our present Southern Alicante Wetlands System, as so as on the influence of the historical consciousness of local population for a more integrated and sustainable management of these cultural ecosystems

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Effect of salinity on the settling velocity of fine sediments of a harbour basin

Cited by 50 publications

References 13 publications

Numerical Simulations of Suspended Sediment Dynamics Due to Seasonal Forcing in the Mekong Coastal Area

Numerical Simulations of Suspended Sediment Dynamics Due to Seasonal Forcing in the Mekong Coastal Area

Late Glacial and Holocene Paleogeographical and Paleoecological Evolution of the Seno Skyring and Otway Fjord Systems in the Magellan Region

El acequia que don Manuel mandó facer: La importancia del conocimiento histórico para la comprensión y gestión del “Sistema de Zonas Húmedas del Sur de Alicante”

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