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Measuring suspended sediment and its wave and turbulence forcing in the Dee estuary

Bolanos, Rodolfo; Moate, Benjamin D.; Souza, Alejandro. 2009 Measuring suspended sediment and its wave and turbulence forcing in the Dee estuary. In: Mizuguchi, Masaru; Sato, Shinji, (eds.) Proceedings of Coastal Dynamics 2009: Impacts of human activities on dynamic coastal processes. Japan, World Scientific, Paper 119, 12pp.

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Abstract/Summary

Coastal areas support many human activities and represent a very important habitat for many marine and bird species. The Dee estuary, located in the eastern Irish Sea, is 20 km long, 8 km wide at the mouth and is characterized by a 10 m tidal range. Suspended and seabed sediments in the Dee contain a diverse assemblage of non-cohesive and cohesive sediments, and therefore the threshold of motion at the bed could be a complex process, dependent on several factors. In this paper, we present data collected during 2 deployments in the Dee, including both acoustic and optical instruments to study the link between the hydrodynamics, turbulence, and suspended sediments. Suspended sediment concentration is clearly controlled by tides following the flood/ ebb and spring/neap cycle. Moderate wave events were observed to increase sediment concentration, though mainly near the bed. High concentrations of silt and very fine sand were found that could support the flocculation processes during the flood and ebb cycle. Sediment concentrations at heights above 1 m from the bed do not present direct relation with bottom stress.

Item Type: Publication - Book Section
Digital Object Identifier (DOI): 10.1142/9789814282475_0119
Programmes: POL Programmes > Shallow coastal seas - function and impacts of change > Process experiments at small scale
ISBN: 978-981-4282-46-8
Additional Information. Not used in RCUK Gateway to Research.: Electronic version of an article published as Proceedings of Coastal Dynamics, 2009, © Copyright World Scientific Publishing Company. http://www.worldscientific.com/index.html
Additional Keywords: Dee estuary, Hydrodynamics, suspended sediment, morphodynamics, turbulence
Date made live: 15 Dec 2009 13:15
URI: http://nora.nerc.ac.uk/id/eprint/8492

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