What is a wave?

Waves can behave in a variety of ways, and have unique characteristics that are deter- mined by the topography of the mountains and the seabed in the actual area. By analyzing the locality wave condition and calculate the damping of this actual wavedamper configura-tion, we ensure that the marina has the proper design. Below you will find some useful words and expressions:

DIMENSIONS

Recommended (max)Max load on equipment Significant wave (H s )Maximum wave (H 0,3 m0,5 m 0.5 m max once per month0.9 m max once per monthDetermined based on 10 years wind for the individual site. Data obtained from DNMI.Determined based on 50 years wind for the individual site. Data obtained from DNMI. max ) H s *1,810 years wave (H 10 years )50 years wave (H 50 years ) Recommended max waves and max area of application for Ørsta equipment in protected areas (ref. guarantee certificate). The conditions that influence the wave height and wave period at a site are: Length of a wave: distance from one crest to the crest of the next wave. Wind velocity (m/s), effective stroke length (fe) and how long the wind acts. Wind velocity is obtained from contacts with local knowledge, meteorological measurements taken at weath-er stations in the local area, or from Norwegian Standard NS-3491-4. The effective stroke length is calculated using diagrams and maps.
Bottom depthWawe lenght Wawe height Wind conditions Tidal fluctuationBottom conditions Current direction Motion of water particles Transmission: a wave's ability to go under or through a structure. Wave height: height of a wave from its crest to the bottom of its trough. Transmission coefficient: the relationship between waves and waves behind a wave- breaker. Significant wave height: is the average value of the highest one-third of waves recorded. Diffraction: is a wave's ability to go around an object in the sea. Significant wave period: the period between each crest for the significant wave. Relationship between the length of a wave and wave period: the relationship between the length of a wave (L) and the wave period (t) can be calculated using the formula: L= 1.56 * t
2 . Effective stroke length (fe): Calculated distance from locality to land, measured in exposed wind direction.
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