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Silt and sand transport in a deep tidal channel of a large estuary (Manukau Harbour, New Zealand) by Malcolm O. Green; Robert G. Bell; Tony J. Dolphin; Andrew Swales is a Earth and Planetary Sciences article available to read on EtoBox.

What is Silt and sand transport in a deep tidal channel of a large estuary (Manukau Harbour, New Zealand) about?

## Ž . Time series of suspended-silt concentration measured by an optical backscatter sensor and suspended-sand concentra-Ž . Ž . Ž tion measured by an acoustic backscatter sensor in a deep channel 14 m MSL of a large New Zealand estuary Manukau . Harbour are analysed. Suspended-sand concentration varied in phase with the current speed and bed shear stress on a Ž . ; 6.2-h cycle, but suspended-silt concentration varied on a semidiurnal ; 12.4-h cycle such that the channel was clear of silt at high tide and maximum silt concentration occurred at low tide. Threshold for initiation of sand motion was found to be related to local skin friction, sand concentration profiles were consistent with settling flux balanced by gradient diffusion with a two-layer sediment diffusivity dependent on local friction velocity, suspended-sand reference concentration was explainable in terms of local skin friction, and changes in the channel-bed sediment were correlated with the suspended-sand load. Therefore, sand suspension in the channel is a ''local'' process and the channel bed is the source of the suspended-sand load. Suspended-sand flux was found to be a highly nonlinear function of the tidal cur

Who reads Silt and sand transport in a deep tidal channel of a large estuary (Manukau Harbour, New Zealand)?

Author

Malcolm O. Green; Robert G. Bell; Tony J. Dolphin; Andrew Swales

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0025-3227)

Published

2000

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)