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MIXING PROCESSES AT THE SEA SURFACE

Objective

The overall objective of the project is to determine the influence of wind, waves, tidal currents, stratification and bottom generated turbulence on the mixing processes in the near-surface layers of the sea.
Work in progress includes the following studies:
to determine the influence of wind, waves, tidal currents, stratification and bottom generated turbulence on the mixing processes in the near surface layers of the sea;
to investigate the use of side scan sonar techniques for the remote measurement of mixing processes;
to develop numerical models for synthesising experimental data and for parameterizing the dependence of mixing processes on environmental conditions.
The experimental techniques used are dye and diesel diffusion experiments and sonar measurements at sea carried out simultaneously, as far as possible.
Dye diffusion experiments will enable cross-plume concentration profiles to be measured in different environmental conditions and hence peak concentrations and variances to be derived which can then be related to diffusion times.
Side-scan sonar experiments will provide measurements of breaking wave frequency and resulting turbulence and will provide data on Langmuir circulation-created bubble bands. The contribution of Langmuir cells to diffusion and mixing will then be investigated.
The experiments will be carried out in both the North Sea, which is characterised by strong tides with little stratification, and in the Mediterranean, which is characterised by weak tides with a considerable degree of stratification.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Warren Spring Laboratory
Address
Gunnels Wood Road
SG1 2BX Stevenage
United Kingdom

Participants (4)

Ente per le Nuove Tecnologie, l'Energia e l'Ambiente (ENEA)
Italy
Address
Pozzuolo Di Lerici
19100 La Spezia
NERC Institute of Oceanographic Sciences
United Kingdom
Address
Deacon Laboratory Brook Road Wormley
GU8 5UB Godalming
UNIVERSITY OF SOUTHAMPTON
United Kingdom
Address
University Road, Highfield
Southampton
UNIVERSITY OF WALES - BANGOR
United Kingdom
Address
College Road, Finance Office
LL57 2DG Bangor (Gwynedd)