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Properties of suspended sediment in the estuarine turbidity maximum of the highly turbid Humber Estuary system, UK

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Abstract

Measurements are presented of the properties of suspended particulate matter (SPM) in the estuarine turbidity maximum (ETM) of the upper Humber and Ouse estuaries during transient, relatively low freshwater inflow conditions of September 1995. Very high concentrations of near-bed SPM (more than 100 g l−1) were observed in the low-salinity (less than 1), upper reaches. SPM within the ETM consisted largely of fine sediment (silt and clay) that existed as microfloc and macrofloc aggregates and individual particles. Primary sediment particles were very fine grained, and typically, about 20–30% was clay-sized at high water. The clay mineralogy was dominated by chlorite and illite. There was a pronounced increase in particle size in the tidal river, up-estuary of the ETM. The mean specific surface area (SSA) of near-bed SPM within the ETM was 22 m2 g−1 on a spring tide and 24 m2 g−1 on a neap tide. A tidal cycle of measurements within a near-bed, high concentration SPM layer during a very small neap tide gave a mean SSA of 26 m2 g−1. The percentage of silt and clay in surficial bed sediments along the main channel of the estuary varied strongly. The relatively low silt and clay percentage of surficial bed sediments (about 10–35%) within the ETM’s region of highest near-bed SPM concentrations and their low SSA values were in marked contrast to the overlying SPM. The loss on ignition (LOI) of near-bed SPM in the turbid reaches of the estuary was about 10%, compared with about 12% for surface SPM and more than 40% in the very low turbidity waters up-estuary of the ETM. Settling velocities of Humber–Ouse SPM, sampled in situ and measured using a settling column, maximized at 1.5 mm s−1 and exhibited hindered settling at higher SPM concentrations.

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Acknowledgements

We are grateful to Mr. Bob Clifton (PML Scientist, retired) for his assistance with surface area analysis and Mr. Norman Bowley (PML Technician and Coxswain, retired) for invaluable assistance and support during the fieldwork. The analyses of these data were undertaken with the aid of a grant from the EstProc research programme (http://www.estproc.net). EstProc is funded within the joint DEFRA/EA (UK) Flood and Coastal Defence R&D Programme of Fluvial, Estuarine and Coastal Processes.

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  1. Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK

    Reginald James Uncles, John Anthony Stephens & Carolyn Harris

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  1. Reginald James Uncles
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  2. John Anthony Stephens
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  3. Carolyn Harris
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Correspondence to Reginald James Uncles.

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Uncles, R.J., Stephens, J.A. & Harris, C. Properties of suspended sediment in the estuarine turbidity maximum of the highly turbid Humber Estuary system, UK. Ocean Dynamics 56, 235–247 (2006). https://doi.org/10.1007/s10236-005-0053-y

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  • DOI: https://doi.org/10.1007/s10236-005-0053-y

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