Water and sediment movement around a coastal headland: Portland Bill, southern UK


Bastos, A., Collins, M. and Kenyon, N. (2003) Water and sediment movement around a coastal headland: Portland Bill, southern UK. Ocean Dynamics, 53, (3), 309-321.

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Description/Abstract

Numerical simulations of tidal flow and sand transport around a coastal headland (Portland Bill, southern UK) were undertaken to investigate patterns of sand transport during the development of tidally induced transient eddies. Results obtained from a 2-D finite-element hydrodynamic model (TELEMAC-2D) were combined with a sediment transport model (SEDTRANS), to simulate the sand transport processes around the headland. Simulation of the tidal flow around Portland Bill has shown the formation and evolution of tidally induced transient eddies, around the headland. During the evolution of these transient eddies, no current-induced bedload (transport) eddy is formed for either side of the headland. Net bedload sand transport direction, around a coastal headland, is the result of instantaneous gradients in bedload transport rates, during flood and ebb flows, rather than the average (residual) flow. Thus, the use of residual (water) circulation to describe patterns of sediment movement as bedload is not an appropriatedapproach. In the case study presented here, the distinct characteristics of the coastal and seabed morphology around the Isle of Portland (i.e. headland shape and the bathymetry) indicate that these parameters can be influencing tidal (flow) and sediment dispersion around the headland. Such an interpretation has broader implications and applications to headland-associated sandbanks elsewhere.

Item Type: Article
ISSNs: 1616-7228 (print)
Related URLs:
Keywords: TIDAL MODELS, PORTLAND BILL, HEADLANDS, NUMERICAL ANALYSIS, TIDAL CURRENTS, SEDIMENT TRANSPORT, SAND BANKS, GEOLOGY
Subjects: Q Science > QE Geology
G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > National Oceanography Centre (NERC)
University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 2265
Date Deposited: 24 May 2004
Last Modified: 27 Mar 2014 18:00
URI: http://eprints.soton.ac.uk/id/eprint/2265

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