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Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling

Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling
Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling
Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to 74.5 mg·L?1): resuspension processes, in response to semi-diurnal tidal cycles (with a period of around 12.4 h) and spring-neap cycles (with a period of 15 days) make significant contributions. Distinctive seasonal/annual concentration changes have also been observed. In the offshore waters, such variability is much less significant (0.9 to 6.0 mg·L?1). In the summer the English Coastal Zone is associated with relatively high SPM concentrations: the Central Zone has a low and stable SPM concentration between these zones, there is a Transitional Zone, where there is a rapid response of SPM concentration to wind forcing. Finally, the French Coastal Zone is characterized by variable (sometimes high) SPM concentrations. Because of the zonation, SPM fluxes within the Dover Strait are controlled by different transport mechanisms. Within the Central Zone, the flux can be represented by the product of mean water discharges and SPM concentrations. However, within the coastal zones fluctuations in SPM concentrations on various time-scales must be considered. In order to calculate the maximum and minimum SPM fluxes, 10 cells were divided in the strait. A simple modelling calculation has been proposed for this complex area. The effect of spring-neap tidal cycles and seasonal changes can contribute significantly to the overall flux, which is of the order of 20×106 t·yr?1 (through the Dover Strait, towards the North Sea). Such an estimate is higher than most obtained previously.
DOVER STRAIT, MODELLING, SUSPENDED PARTICULATE MATTER, PARTICULATE FLUX, SEDIMENT TRANSPORT
0399-1784
687-700
Lafite, R.
01cfecda-a2c3-417a-ba66-a6f41c531c50
Shimwell, S.
30a98d04-1082-4797-bd3e-bc0cae94b8fa
Grochowski, N.
6611de94-7f2b-4109-b480-a28de61c0a7c
Dupont, J-P.
1669a66f-6c13-4666-bbea-589d3a3ed779
Nash, L.
7db7e211-fc26-408a-8fcc-26d4ba9cd1f0
Salomon, J-C.
f5579a85-d668-4d61-9916-1bccf4e65b3d
Cabioch, L.
146b5b8b-3531-4a78-ab0d-399406c3508a
Collins, M.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Gao, S.
e5fd97ae-239b-4c27-8c54-a9e73865c22a
Lafite, R.
01cfecda-a2c3-417a-ba66-a6f41c531c50
Shimwell, S.
30a98d04-1082-4797-bd3e-bc0cae94b8fa
Grochowski, N.
6611de94-7f2b-4109-b480-a28de61c0a7c
Dupont, J-P.
1669a66f-6c13-4666-bbea-589d3a3ed779
Nash, L.
7db7e211-fc26-408a-8fcc-26d4ba9cd1f0
Salomon, J-C.
f5579a85-d668-4d61-9916-1bccf4e65b3d
Cabioch, L.
146b5b8b-3531-4a78-ab0d-399406c3508a
Collins, M.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Gao, S.
e5fd97ae-239b-4c27-8c54-a9e73865c22a

Lafite, R., Shimwell, S., Grochowski, N., Dupont, J-P., Nash, L., Salomon, J-C., Cabioch, L., Collins, M. and Gao, S. (2000) Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling. Oceanologica Acta, 23 (6), 687-700. (doi:10.1016/S0399-1784(00)00144-4).

Record type: Article

Abstract

Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to 74.5 mg·L?1): resuspension processes, in response to semi-diurnal tidal cycles (with a period of around 12.4 h) and spring-neap cycles (with a period of 15 days) make significant contributions. Distinctive seasonal/annual concentration changes have also been observed. In the offshore waters, such variability is much less significant (0.9 to 6.0 mg·L?1). In the summer the English Coastal Zone is associated with relatively high SPM concentrations: the Central Zone has a low and stable SPM concentration between these zones, there is a Transitional Zone, where there is a rapid response of SPM concentration to wind forcing. Finally, the French Coastal Zone is characterized by variable (sometimes high) SPM concentrations. Because of the zonation, SPM fluxes within the Dover Strait are controlled by different transport mechanisms. Within the Central Zone, the flux can be represented by the product of mean water discharges and SPM concentrations. However, within the coastal zones fluctuations in SPM concentrations on various time-scales must be considered. In order to calculate the maximum and minimum SPM fluxes, 10 cells were divided in the strait. A simple modelling calculation has been proposed for this complex area. The effect of spring-neap tidal cycles and seasonal changes can contribute significantly to the overall flux, which is of the order of 20×106 t·yr?1 (through the Dover Strait, towards the North Sea). Such an estimate is higher than most obtained previously.

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More information

Published date: 2000
Keywords: DOVER STRAIT, MODELLING, SUSPENDED PARTICULATE MATTER, PARTICULATE FLUX, SEDIMENT TRANSPORT

Identifiers

Local EPrints ID: 8969
URI: https://eprints.soton.ac.uk/id/eprint/8969
ISSN: 0399-1784
PURE UUID: 305baf0f-3e0c-450c-8cfc-02db1b46dc3f

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Date deposited: 10 Sep 2004
Last modified: 17 Jul 2017 17:12

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