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 Subiectul mesajului: Prognoza marina
MesajScris: Mie Sep 21, 2011 10:25 pm 
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Membru din: Joi Sep 15, 2011 4:55 am
Mesaje: 580
Localitate: Darwin-Australia
Notiuni despre valuri, hula, modele de prognoza a valurilor etc.


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 Subiectul mesajului: Re: Prognoza marina
MesajScris: Mie Sep 21, 2011 10:29 pm 
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Membru din: Joi Sep 15, 2011 4:55 am
Mesaje: 580
Localitate: Darwin-Australia
wave watch III

http://polar.ncep.noaa.gov/waves/index.shtml

are si o trimitere la COMET ...


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 Subiectul mesajului: Re: Prognoza marina
MesajScris: Mie Sep 21, 2011 11:03 pm 
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Membru din: Joi Sep 15, 2011 4:55 am
Mesaje: 580
Localitate: Darwin-Australia
cateva notiuni legate de valuri, notiuni folosite in marine forecasting:

-lungimea unui val = dist dintre 2 creste sau 2 baze a 2 valuri-
-inaltimea unui val ( wave height) - dist de la creasta la baza
-frecventa( wave period) timpul in secunde scurs de la trecerea unei creste la urmatoarea printr-un punct fix.


-wind wave- este valul generat de vanturile locale ( care sufla in momentul observatiei)
-swell ( hula) - valuri care nu sunt generate de vanturi locale ci de sisteme barice la distanta
-fetch - o lungime de apa expusa vantului cu aceeasi directie si intensitate; cu cat fetch este mai mare cu atat valurile au energie mai mare.

valuri:
-H val semnificativ ( significant wave height)- inaltimea (m) a 1/3 din campul de valuri.
-Rogue wave- dublul Sig wave height
-combined sea-sau sea state reprezinta valoarea combinata sig wave plus swell ...
http://www.bom.gov.au/marine/about/comb ... well.shtml


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 Subiectul mesajului: Re: Prognoza marina
MesajScris: Mie Sep 21, 2011 11:06 pm 
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Membru din: Joi Sep 15, 2011 4:55 am
Mesaje: 580
Localitate: Darwin-Australia
Beaufort Wind Scale

Cei cu boating-ul sau fishing-ul( chiar si meteoe) folosesc adesea Beaufort Scale pentru a descrie sea state.

Please note: Beaufort scale numbers and descriptive terms such as 'near gale', 'strong gale' and 'violent storm' are not normally used in Bureau of Meteorology communications or forecasts.
Beaufort scale number Descriptive term Units in km/h Units in knots Description on Land Description at Sea
0 Calm 0 0 Smoke rises vertically Sea like a mirror.
1-3 Light winds 19 km/h or less 10 knots or less Wind felt on face; leaves rustle; ordinary vanes moved by wind. Small wavelets, ripples formed but do not break: A glassy appearance maintained.
4 Moderate winds 20 - 29 km/h 11-16 knots Raises dust and loose paper; small branches are moved. Small waves - becoming longer; fairly frequent white horses.
5 Fresh winds 30 - 39 km/h 17-21 knots Small trees in leaf begin to sway; crested wavelets form on inland waters Moderate waves, taking a more pronounced long form; many white horses are formed - a chance of some spray
6 Strong winds 40 - 50 km/h 22-27 knots Large branches in motion; whistling heard in telephone wires; umbrellas used with difficulty. Large waves begin to form; the white foam crests are more extensive with probably some spray
7 Near gale 51 - 62 km/h 28-33 knots Whole trees in motion; inconvenience felt when walking against wind. Sea heaps up and white foam from breaking waves begins to be blown in streaks along direction of wind.
8 Gale 63 - 75 km/h 34-40 knots Twigs break off trees; progress generally impeded. Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks along the direction of the wind.
9 Strong gale 76 - 87 km/h 41-47 knots Slight structural damage occurs -roofing dislodged; larger branches break off. High waves; dense streaks of foam; crests of waves begin to topple, tumble and roll over; spray may affect visibility.
10 Storm 88 - 102 km/h 48-55 knots Seldom experienced inland; trees uprooted; considerable structural damage. Very high waves with long overhanging crests; the resulting foam in great patches is blown in dense white streaks; the surface of the sea takes on a white appearance; the tumbling of the sea becomes heavy with visibility affected.
11 Violent storm 103 -117 km/h 56-63 knots Very rarely experienced - widespread damage Exceptionally high waves; small and medium sized ships occasionally lost from view behind waves; the sea is completely covered with long white patches of foam; the edges of wave crests are blown into froth.
12+ Hurricane 118 km/h or more 64 knots or more Very rarely experienced - widespread damage The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected


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 Subiectul mesajului: Re: Prognoza marina
MesajScris: Joi Sep 22, 2011 12:13 am 
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-40 °C
-40 °C
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Membru din: Dum Feb 17, 2008 1:00 pm
Mesaje: 13480
Localitate: Tg-Mures
Mai ales centrele meteo din Pacific folosesc scara Beaufort.Cei din Fiji stiu ca folosesc aceasta scara si la ciclonii tropicali...


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 Subiectul mesajului: Re: Prognoza marina
MesajScris: Joi Sep 22, 2011 7:25 am 
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Membru din: Joi Sep 15, 2011 4:55 am
Mesaje: 580
Localitate: Darwin-Australia
Chiar si aici, check Darwin high seas se foloseste Beaufort, urmeaza sa schimbam, nu am fost prea incantat, in Atlantic Canada marine forecasting era un "higher"level.


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