|
|
|
|
|
| Souza, Aj; Simpson, Jh; Harikrishnan, M; Malarkey, J. |
| The intensity, structure and variability of the slope current have been determined from 16 months of observations with Acoustic Doppler Current Profilers (ADCP) and conventional current meters on a cross-slope section at the Hebridean shelf edge during the Shelf Edge Study (SES) programme. After removal of the tidal signals, the mean flow over the upper slope is found to be closely parallel to the topography with speeds of . 20 cmEs.1. The flow extends down to a depth of 500 m and is predominantly barotropic, especially in winter when the flow is practically uniform between 350 m and the surface. In summer, there is a significant baroclinic component with a pronounced maximum in current at a depth of about 200 m but more than 80% of the kinetic energy is... |
| Tipo: Text |
Palavras-chave: Slope current; Seasonality; Velocity structure. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00292/40275/38648.pdf |
| |
|
|
| Visser, Aw; Souza, Aj; Hessner, K; Simpson, Jh. |
| Observations of the semi-diurnal tidal current ellipses within the Rhine ROFI are reported. The vertical structure of these tidal ellipses are observed to be significantly different for stratified and well mixed conditions. in particular, during well mixed conditions, tidal currents are essentially rectilinear and directed parallel to the coast. With the onset of stratification, significant cross-shore components, reaching 40% of the magnitude of the along-shore components appear. These components are 180 degrees out of phase from near surface to near-bottom with surface currents rotating anticyclonically, and bottom currents cyclonically. It is proposed that this phenomenon may be explained by a decoupling of the upper and lower portions of the water... |
| Tipo: Text |
|
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00098/20898/18511.pdf |
| |
|
|
| Simpson, Jh; Bos, Wg; Schirmer, F; Souza, Aj; Rippeth, Tp; Jones, Se; Hydes, D. |
| The nature of the physical regime in the vicinity of the Rhine ROFI (Region Of Freshwater Influence) has been determined in a series of collaborative observations. Extensive surveys with shipboard CTD/rosette systems have been used to complement time series observations by an array of moorings instrumented with currentmeters, transmissometers and fluorimeters. The observations reveal a highly variable system in which the influence of the freshwater input from the Rhine extends northeastwards from the source and out to 30 km from the coast. The mean flow within this region is generally parallel to the coast (northeastwards) and with surface speeds, determined by the HF radar, of 15-20 cm.s-1. The residual current at sub-tidal frequencies was strongly... |
| Tipo: Text |
Palavras-chave: FRESH-WATER INFLUENCE; TIDAL MIXING; PERIODIC STRATIFICATION; COASTAL REGION. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00099/21050/18676.pdf |
| |
|
|
|
