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Windstärken

Windstärkentabelle

1

Freitag, 28. Juni 2019, 12:49

Welle vs. Seegang vs. Seegang2

Hallo zusammen,

kann mir jemand erklären, was in Windy (https://www.windy.com ) die Unterschiede sind zwischen "Welle" und den darunter liegenden Parametern "Seegang" und "Seegang2"?

Vielen Dank und Grüsse,
Manfred

beeblebrox

Proviantmeister

Beiträge: 385

Wohnort: Hamburg

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2

Freitag, 28. Juni 2019, 13:12

Klar,

laut Hilfe (https://community.windy.com/topic/3361/d…ther-overlays/2) gibt es diese Angaben:

Waves: Signifikant wave height and its period of all wave types combined (swell and wind waves). Close to the shoreline, the actual height is influenced by the shape of the sea bottom.

Swell1: A swell consists of wind-generated mechanical waves that are not significantly affected by the local wind at that time. They have been generated elsewhere and some time ago, usually travelling long distances.

Swell2: Secondary swell is produced also by winds far away but in other places than Swell1. It has different heights, directions and periods than Swell1.

Swell3: Another secondary swell, with different heights, directions and periods than Swell1 and Swell2. More detailed info about the swells is here.

Wind waves: Wind waves, or wind-generated waves, are surface waves that occur on the free surface of bodies of water (like oceans, seas, lakes, etc.). They result from the wind blowing over an area of water surface. Wind waves are generated by the immediate local wind – which gives them the direction. After the wind ceases to blow, wind waves are called

Nutze auch Windy, aber die meisten Angaben lege ich gar nicht als Layer auf...

Lutz
Segeln braucht kein Mensch - aber der Mensch braucht Segeln

Beiträge: 1 584

Wohnort: Hamburg

Schiffsname: Sioned

Bootstyp: Amel Maramu 46

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3

Freitag, 28. Juni 2019, 13:15

Seegang ist die unglückliche Übersetzung von swell. Dünung wäre korrekter.

Aus der Hilfe:

The seastate that you can observe in a given place, is a mix of different type of waves:

The windsea (also called wind waves) is produced by the local wind.
The main swell is produced by a strong wind in a remote place. The swell travels great distances to where you observe it.
Secondary swells are produced also by winds in other remote places.
All of them have different heights, come from different directions and show different periods (i.e. the time between 2 wave crests)
Swell 1 is the main swell,
Swell 2 and 3 are secondary swells

Waves is the sea state (also called total sea) that you can observe in a given place = Wind Waves + Swell1 + Swell2 + Swell3
Wind waves is produced by the local wind
Swell 1 is the main swell produced by remote wind
Swell 2 is a smaller swell produced by an other remote wind
Swell 3 mostly is very small and neglected.

What is the interest of knowing these different types of waves?
For Surfers the best conditions are a strong Swell 1 with low Wind Waves and low Swell 2/3. With strong Wind Waves and strong Swell, waves are very disorganised especially if their directions are different ... « like in a washing machine »
For Sailors, Wind Waves at 90º of the Swell direction give a «cross sea » tougher than a sea with all kind of waves in the same direction
Michael
SY Sioned

4

Samstag, 29. Juni 2019, 08:59

Super. Herzlichen Dank fürs das Erklären! :danke:
Grüsse Manfred

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