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Suspended sediment fluxes in the Humber catchment, UK

✍ Scribed by Paul D. Wass; Graham J. L. Leeks

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
342 KB
Volume
13
Category
Article
ISSN
0885-6087

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✦ Synopsis

An extensive sediment monitoring network was established within the LOIS programme, involving 10 of the main tributaries of the River Humber (UK). Its primary purpose was to measure the ¯ux of suspended sediment to the estuary. A turbidity monitoring system was developed to provide a continuous record of suspended sediment concentration in the rivers, from which the ¯uxes were calculated. Linear relationships were established between suspended sediment concentration and turbidity (with slopes varying from 0 . 89 to 1 . 69) to enable the conversion of nephelometric turbidity [NTU] to suspended sediment concentration [mg l À1 ]. Potential uncertainties were identi®ed and quanti®ed. The suspended sediment ¯ux to the Humber (November 1994±October 1997) was calculated to be 699 861 t, equivalent to a yield of 15 t km À2 yr À1 . Large temporal and spatial variations in the ¯ux were measured during the monitoring period, in response to factors such as climate, land use, catchment scale, deposition and reservoir trapment. The particle size composition of the suspended sediment was measured and found to vary little, except at very high discharges, when it coarsened. The organic content of the sediment was found to be directly related to the discharge of sewage euent to the rivers.

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