Altura Onda Marítima
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
H_s
About this calculator
The Sea Wave Height Calculator is an online tool that calculates the significant wave height, denoted by H_s. Significant wave height is a crucial parameter in oceanography and coastal engineering, as it directly influences the intensity of waves and their effects on coastlines and maritime structures.
The formula used by this calculator is H_s = 4·√(m₀), where m₀ is the zeroth-order spectral moment of the wave spectrum. The wave spectrum is a mathematical representation of the distribution of wave energy across different frequencies. The zeroth-order spectral moment (m₀) is a measure of the variance of the spectrum and is related to the total energy contained in the waves.
Significant wave height is used to predict wave intensity under different sea conditions. It is particularly useful in coastal engineering projects, such as the construction of ports, breakwaters, and other structures that need to withstand the forces exerted by sea waves. It is also an important measure for safe navigation and the planning of maritime activities.
When using this calculator, it is essential to be mindful of the units used and to ensure that the input values are realistic and correspond to the specific conditions being studied. The accuracy of the output directly depends on the accuracy of the input data and the understanding of the context in which they are being applied.
Frequently asked questions
What is significant wave height?
Significant wave height is the average height of the one-third highest waves in a given time period. It is an important parameter for describing sea wave intensity.
How does the formula H_s = 4·√(m₀) work?
The formula uses the zeroth-order spectral moment (m₀) of the wave spectrum to calculate significant wave height. It is a simplified approach that relates wave energy to wave height.
In what situations is it important to calculate significant wave height?
It is crucial in coastal engineering projects, maritime navigation, port construction, and for structures that need to withstand sea wave forces.
What precautions should I take when using this calculator?
Check the units of input values and ensure they are realistic for the conditions you are studying.
Can the calculator predict specific waves?
No, the calculator provides an estimate of significant wave height based on the wave spectrum. More complex models and detailed data are required for specific predictions.