Linear wave theory is also known as:

- Airy theory;
- Sinusoidal wave theory;
- Small amplitude wave theory.

Description:

- It has only single sinusoidal component;
- It is the simplest wave theory obtained by taking the wave height, H to me much smaller than both the wave length, λ and water depth, d.
- Wave crest height, AC = Wave trough height, AT and is denoted the wave amplitude, A, hence H=2A.
- Linear wave theory is the first approximation to the wave motion. In order to achieve theoretical results closer to the reality requires to solve the equations to higher perturbations (non-linear system).

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