A new technique for injecting fluorescent sand tracer in sediment transport experiments in a shallow water marine environment

Lees, B.J.

doi:10.1016/0025-3227(79)90077-x

Cited by 5 publications

(1 citation statement)

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“…1). Lees (1979Lees ( , 1981 gives details of this experiment, during which the dispersion of the marked tracer, similar in grain size distribution to the sea-bed sand, was monitored over a period of 74 months (231 days). The current measurement programme, which provided the data used to predict bedload transport paths and directions, is described by Heathershaw & Lees (1980).…”

Section: Techniquesmentioning

confidence: 99%

The relationship of sediment transport rates and paths to sandbanks in a tidally dominated area off the coast of East Anglia, U.K.

Lees

1983

Sedimentology

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Sand transport measurements of bedload and suspended load in the Sizewell‐Dunwich Banks area, East Anglia have shown that the suspended mode is dominant. The depth‐integrated spring tidal residual is 5.66 g cm−1 sec−1, although the neap rate is only one‐fifth of this. The calculated bedload transport rates also vary, from 0.012 to 0.040 g cm−1 sec−1, correlating with changing meteorological conditions. In order to predict the bedload sediment circulation pattern from midwater current meter measurements, five sediment transport equations were calibrated, using fluorescent dyed sand. Yalin's relationship gave the best estimates. The bed shear stress was determined by extrapolating the velocity profile as a power law relationship, with an exponent equal to 0.1, from midwater down to 2 m and as a lognormal profile from 2 m to the sea‐bed. Roughness length values appropriate to the substrate were used. Although bedload transport residuals are mainly to the south, the banks trend northwards from the coast and have also elongated in this direction. This is thought to be in response to the dominance of the suspended sediment transport. It is suggested that a tidal residual eddy mechanism is responsible for the banks’maintenance, similar to the process operating in Start Bay, Devon. The well‐documented westward movement of the banks is likely to be related to wave processes.

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Section: Techniquesmentioning

confidence: 99%