Pollutant Trapping at a Coastal Headland
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131, Issue 3
Abstract
A study of flow behavior, namely, pollutant dispersion and trapping near a headland recirculation zone adjacent to it was undertaken experimentally in the Manchester Tidal Facility for steady flows. The planar laser-induced fluorescent technique was used to visualize the flow patterns both horizontally and vertically. Dye was released using a preburied dye diffuser in the bed to simulate trapped pollutant released from the rough bed, and also through a tube placed at middepth to simulate the case of ocean outfall discharges. The discharge points chosen were within the recirculation zone, between the recirculation zone and the main current, and at a point near the main current where the flow changes. For middepth discharges the dye tended to stay near the surface, whereas for dye diffuser discharges the dye stayed near the boundary layer, and also exhibited a three-dimensional plume structure. Trapping was significant especially for certain discharge points in the recirculation zone due to the slower velocities.
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Acknowledgments
This study was supported by a grant (No. (GR/L/34570) from the U.K. Engineering and Physical Science Research Council (EPSRC). The PhD study of one of the writers (F.E.T.) is also partially supported by a U.K. Overseas Research Studentship.
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Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131 • Issue 3 • May 2005
Pages: 98 - 114
Copyright
© 2005 ASCE.
History
Received: Oct 3, 2003
Accepted: Aug 31, 2004
Published online: May 1, 2005
Published in print: May 2005
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