Information about Adriatic Sea
Adriatic or Adria was a name of sea port. Today city Adria is on Italian coast, 38 kilometers from sea, witch is a result of geological forces, because today the north coast is hoisting, and south lower.
Adriatic consist area between Balkans and Apenins peninsula. Part witch belongs to Croatia Republic is area from east coast, witch is a space between Portage on south to the cape Savudrija on the west, including all islands, islets and cliffs alongside coast, and Palagruza archipelago (number of islands, islets and cliffs are over 1700). Like that presents uniquely area in the Europe for cruising with ships, powerboat or sailboats, even for enjoying under sea world.
Hydraulic and oceanography data
The most flatness sea is in Istra. There depth doesn't go over 50 meters. From Pula the sea bottom drops down and make long and tight vale, witch goes from Zirja unto Italy and it's called Apple ravine. The most biggest depth is about 240 meters. From Apple ravine sea bottom rise up till Palagruzan rock, where is the most depth 130 meters. To the south the bottom steeply goes to Southadriatic valley, where is measured 1 300 meters of depth.
The phenomenon of the underground relief caused by tectonic shifting, and erosion that happened a millions of years ago in the time when specific parts of the sea floor was a land or seacoast region. That process is slow but constant.
High water and ebb tide of Adriatic sea have relatively small amplitude. In south part that difference rarely goes over 40 cm, as in north part goes little bit bigger, so in Istra and Trschan bay amounts 1 meter. In some tight ducting and bays, hight water can go pretty high during strog blow. That phenomenon is characteristic for big and deep bays on south of Adriatic. Sea changes are mixed type, witch means that they have half-day rhythm during full moon and half full moon, and day rhythm during 1st and last quarter. Their amplitude are very irregular.
Sea currents are under impact of winds, pressure difference, temperature and sea salinity. According to route, can be horizontal and vertical. There are currents from bottom of the sea, they are consequence circulation sea water from hotter places into coldest. During that circulation callow is getting colder and goes down to the bottom of the sea. Adriatic sea currents are notice. Speed is changed in referred areas. It depends on weather time period. Average speed is about 0,5 nodes and can rich speed from 4 nodes.
Adriatic sea have very pronouncedly years of a temperature variat. Average temperature is 11°C. The most coldest is during the winter, and the average temperature is about 7°C; rarely goes lower. In spring goes warmer, sea surface temperature grows to 18°C. In summer goes to even 22-25°C, on the south Adriatic and Istra to 27°C. The parts of water column witch apples same temperature is distinguishable, it's most manifestly during the summer. On winter, temperature in water column are equalizing. We can observe it, on summer, in deepness 3-5 m, next on about 12 m, next on 18 m, meanwhile on deepness more than 30 m, the temperature are the same during the year
Waves are consequence of wind. The most bigger range, surface on witch wind blows, the bigger weaves will become. Their strongest depend on coast shape and her expose. The are hill and valley of the wave. Wave length and distance is between two valley of the wave. Highness of Adriatic waves are mostly between 0,5 - 1,5 m, but very rarely goes beyond 5 meters.
Basic winds on Adriatic sea is bora, mistral and scirocco.
Bora - northeast (NE) wind, witch comes under high pressure over shore and hastily with full strength blows form shore to the sea. Bora is hard to predicte, but there are the sings; tops of coast alps are in little clouds and the sea surface form NE are in foam crowns. When foam crowns reach their own vessel, soon will vessel take hold and wind with full strength. If the distance from shore to mainland is bigger the wind will be inferior. Bora blows only a few hours, sometimes even 1 or 2 days. Extremely strong boras blow in Kvarner, Velebit Channel, around Sibenik, Split, Peljesac and Dubrovnik.
Mistral - is a daily, thermic wind blowing from the direction of the northwest, and it occurs as the consequence of the difference in the speed of warming up of the land and the sea. It is present from the spring to the autumn, and, during the day, it often changes the direction of blowing. The landward breeze is more present in the southern Adriatic than in the northern Adriatic, and it starts to blow earlier there.
Sirocco is a warm and moist wind which blows from the direction east-southeast to south-southwest. Its consequences are high waves and rain. Sirocco is a characteristic wind for the southern Adriatic, where it blows longer and stronger than in the northern part. In the summer, it usually blows as long as 3 days, and in the winter even as long as 3 weeks. The signs of the oncoming sirocco are the calm at the sea, weak changeable winds, dimness of the horizon, the increase of the temperature and moisture, and the gradual decrease of the pressure. Waves from the direction of the southeast become bigger.
The stiff breeze is a wind blowing contrary to the landward breeze. It blows during the night from the direction of the north, north-east in the northern Adriatic, and in the southern Adriatic, from the east or south-east. It is the strongest before the dawn, and after that it stops soon.
The whole of the Croatian coast is covered by radio communications rather well.
The Blue Flag is a project for preserving the sea and coast which has been carried out in Europe for fifteen years now, and includes beaches and marinas, and from the year 2000 has extended throughout world
The Blue Flag symbolizes preserved, safe and pleasant environment for fun, relaxation and recreation, but it also includes an elaborated system of managing the resources, and sustainable development in tourism.