1. What is the Fetch Length Formula?

The Fetch Length formula calculates the horizontal distance over which wave-generating winds blow based on wave height and wind velocity. It is particularly useful for fetch distances greater than 20 miles.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( F \) — Fetch Length (m)
• \( h_a \) — Height of Wave (m)
• \( V_w \) — Wind Velocity (m/s)

Explanation: The formula calculates the fetch length by squaring the ratio of wave height to 0.17, then dividing by wind velocity.

3. Importance of Fetch Length Calculation

Details: Accurate fetch length calculation is crucial for coastal engineering, wave prediction, and understanding wave generation processes in oceanography and meteorology.

4. Using the Calculator

Tips: Enter wave height in meters and wind velocity in meters per second. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is fetch length in wave mechanics?
A: Fetch length is the horizontal distance over which wave-generating winds blow, which directly affects wave height and energy.

Q2: Why is 0.17 used in the formula?
A: The constant 0.17 is derived from empirical relationships between wave height, wind velocity, and fetch length in wave generation studies.

Q3: When is this formula applicable?
A: This formula is specifically designed for fetch distances greater than 20 miles and provides accurate results for such conditions.

Q4: Are there limitations to this formula?
A: The formula may be less accurate for very small fetch distances, complex wind patterns, or in enclosed water bodies with limited fetch.

Q5: How does wind velocity affect fetch length?
A: Higher wind velocities generally result in longer fetch lengths for the same wave height, as more energy is transferred to the water surface.