| Autor: |
Gačić, Miroslav, Kovačević, Vedrana, Mazzoldi, A., Paduan, J.D., Mancero-Mosquera, I., Yari, S. |
| Jazyk: |
angličtina |
| Rok vydání: |
2009 |
| Předmět: |
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| Popis: |
Surface patterns of the low-frequency current in a 20 x 30 km region in front of the Venice Lagoon were analysed from a 13-month-long HF radar data set. Sur-face circulation was related to prevalent wind regimes in the area and to the tidal flow through the lagoon inlet. Three different categories of wind-forcing were defined: bora (NE wind), sirocco (SE wind), and finally the category containing all other wind directions and calms (winds lower than 3 m/sec). Mean flow and vorticity spatial distributions were discussed for different wind conditions. The coastal area about 5 km wide is characterized by a flow field with maximum vorticity. Outside the coastal boundary layer the interior flow is part of the Adriatic basin-wide cyclonic circulation. Two counter-rotating vortices of the dimension of about 4-5 km were evidenced in the average flow field in front of the lagoon inlet (Malamocco inlet) in all situations except for the bora. The vortex-pair is probably associated with the tidal flow through the inlet. The bora wind induces a strong southward coastal jet detached from the coast by about 5 km homogenizing the flow and eliminating the dipole. The average coastal flow pattern in calm wind conditions was also analysed as a function of the strong inflow/outflow (currents in the inlet > 0.7 m s(-1)) from the lagoon inlet. In both cases the vorticity pattern is similar, with the negative vorticity to the left of the inlet and positive to the right looking seaward. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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