adriatic sea
Beaufort Scale:
| beaufort
# |
knots |
description |
specification |
0 |
<1 |
calm |
calm,
smoke rises vertically |
| 1 |
1-3 |
light
air |
direction
of wind shown by smoke not by wind vanes |
2 |
4-6 |
light
breeze |
wind
felt on face, leaves rustle, vanes moved by wind |
3 |
7-10 |
gentle
breeze |
leaves
and small twigs in constant motion, winds extends light flag |
4 |
11-16 |
moderate |
raises
dust, loose paper, small branches moved |
5 |
17-21 |
fresh |
small
trees in leaf begin to sway, wavelets form on inland waters |
6 |
22-27 |
strong |
large
branches in motion, whistling heard in wires |
7 |
28-33 |
near
gale |
whole
trees in motion, inconvenience felt walking against the wind |
8 |
34-40 |
gale |
breaks
twigs off trees, impedes progress |
9 |
41-47 |
strong
gale |
slight
structural damage occurs |
10 |
48-55 |
storm |
trees
uprooted, considerable damage occurs |
11 |
56-63 |
violent
storm |
widespred
damage |
12 |
64-71 |
hurricane |
widespread
damage |
Waves Waves occur primarily as the consequence of wind blowing over the water surface. Their intensity depends on the configuration and the exposure of the coast. Hence mixing of the surface layer with water from the deep is enabled, and the interaction between the atmosphere and the sea. We distinguish the crest and the trough of a wave. The length of the wave is the distance between two troughs. Most often, heights of waves in the Adriatic are between 0.5 and 1.5 meters, and they very rarely exceed 5 meters. Tides In the Adriatic, the high and low tides have relatively small amplitudes. In the southern part, the difference is rarely above 0.4 meter, while in the northern part it is somewhat bigger, up to 1 meter in Istria and the Gulf of Trieste. In some narrow channels and bays, the high tide can grow considerably during a strong sirocco. That phenomenon is characteristic for big and deep bays of the southern Adriatic. The tides are of a mixed type, which means that their rhythm is semidiurnal during the new and the full moon, and of a daily type during the first and the last quarter. Their amplitudes are very irregular. Currents Sea currents occur under the influence of winds, the difference in pressure, temperature, and the differences in salinity. With respect to the direction, they can be horizontal or vertical. There are also bottom currents which happen as the consequence of water circulating from warmer areas to colder ones, during which the surface layer gets cold and descends towards the seabed. Currents are weakly observable in the Adriatic. The speed of currents changes in particular areas, but it also depends on time periods. The average speed of currents is about 0.5 knots, but they can also rise up to 4 knots. |