# What is 1/3 of the wave spectrum?

## What is 1/3 of the wave spectrum?

1. The significant wave height, H_s, is the mean of the highest third of the waves; instead of H_s the notation H_{1/3} is also often used. H_s represents well the average height of the highest waves in a wave group. The significant wave height can also be computed from the wave energy.

### What is the formula for wave height?

Wind Generated Ocean Waves The significant wave height, Hs can be calculated from the spectrum ( H s = 4 σ 2 = ∫ F ( f ) d f ) . . As the estimate of the spectrum, is a stochastic variable, quantities such as which are derived from it, will also be stochastic variables.

#### What 3 things determine the wave height?

Wave height is affected by wind speed, wind duration (or how long the wind blows), and fetch, which is the distance over water that the wind blows in a single direction. Large waves occur only when all three factors combine (Duxbury, et al, 2002.)

Is there a limit to wave height?

The maximum ever measured wave height from a satellite is 20.1m during a North Atlantic storm in 2011.

What wave height is rough seas?

Wave explanations

Description Height (metres) WMO Sea State code
Smooth 0.1 – 0.5 2
Slight 0.5 – 1.25 3
Moderate 1.25 – 2.5 4
Rough 2.5 – 4 5

## How high is a 10 m wave?

Force Name Wind Speed knots mph
Wave height: 7-10 m (23-32 ft) – Sea: High waves – Sea rolls – Reduced visibility
10 Storm 55-63
Wave height: 9-12.5 m (29-41 ft) – Sea: Very high waves with overhanging crests
11 Violent Storm 64-73

### What are the 3 causes of waves?

Waves are dependent on three major factors – wind speed, wind time and wind distance.

#### What causes wave?

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. The gravitational pull of the sun and moon on the earth also causes waves.

What are 4 parts of a wave?

Wave Crest: The highest part of a wave. Wave Trough: The lowest part of a wave. Wave Height: The vertical distance between the wave trough and the wave crest. Wave Length: The distance between two consecutive wave crests or between two consecutive wave troughs.