Chapter
Apr 26, 2012
Field Measurement and Modelling of Scour Pit Dynamics in a Sandy Estuary
Publication: Coastal Sediments '07
Abstract
Field observations and model simulations are presented of the tidal flow over a scour hole at the mouth of the Dyfi Estuary, mid-Wales, U.K. This scour hole is maintained by locally high flow speeds resulting from convergence, and then divergence, of the flow over the hole. Fixed features of the local bathymetry may also have served to stabilise its location (over decades). Model simulations of steady flow over a variety of schematised pits of different elliptical shape on an otherwise flat bed are presented to show that shallow elongated pits can (almost) preserve the upstream flow speed at their centre point, making them potentially self-maintaining. Deeper pits reduce the flow speed and so will infill.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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School of Ocean Sciences, University of Wales (Bangor), Menai Bridge, Anglesey, LL59 5AB, U.K. E-mail: [email protected]
School of Ocean Sciences, University of Wales (Bangor), Menai Bridge, Anglesey, LL59 5AB, U.K. E-mail: [email protected]
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