Finite-depth wave dispersion solver calculator

Calculate wave number and wavelength with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use wave number and wavelength to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Period (seconds)
10
Water depth (m)
20
Gravity (m/s²)
9.80665
Wave number (rad/m)
0.051837
Wavelength (m)
121.209844
Dispersion residual (1/s²)
0

Try another scenario

Period (seconds)
11
Water depth (m)
20
Gravity (m/s²)
9.80665
Wave number (rad/m)
0.045896
Wavelength (m)
136.901759
Dispersion residual (1/s²)
-0
Calculation method

Calculation method

Wave number (rad/m)

Positive root of g k tanh(kh)=(2pi/T)².

Wavelength (m)

2pi/k.

Dispersion residual (1/s²)

g k tanh(kh)−(2pi/T)².

Symbols and units
a
Period (seconds)
b
Water depth (m)
c
Gravity (m/s²)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Period, water depth, tolerance. Returns Wave number-wavelength and residual. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Period (seconds): minimum 1e-12, maximum 1000000000000.0. Water depth (m): minimum 1e-12, maximum 1000000000000.0. Gravity (m/s²): minimum 1e-12, maximum 1000000000000.0.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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