Monthly Mean Wind Velocity Given Evaporation Loss Per Month Calculator

Meyer's Formula:

\[ u = \left( \frac{E_m}{C \times (V - v)} - 1 \right) \times 16 \]

Evaporation Loss Per Month (Em):

Meyer's Constant (C):

Maximum Vapour Pressure (V):

cm Hg

Actual Vapour Pressure (v):

cm Hg

Mean Wind Velocity (u):

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1. What Is Meyer's Formula?

Meyer's Formula is an empirical equation used to estimate mean wind velocity based on evaporation loss, vapour pressures, and Meyer's constant. It provides a practical approach for calculating wind velocity in hydrological and meteorological studies.

2. How Does The Calculator Work?

The calculator uses Meyer's formula:

\[ u = \left( \frac{E_m}{C \times (V - v)} - 1 \right) \times 16 \]

Where:

\( u \) — Mean Wind Velocity (cm/s)
\( E_m \) — Evaporation Loss Per Month (m)
\( C \) — Meyer's Constant (1.1 for deep water, 1.5 for shallow water)
\( V \) — Maximum Vapour Pressure (cm Hg)
\( v \) — Actual Vapour Pressure (cm Hg)

Explanation: The formula calculates wind velocity by relating evaporation loss to the vapour pressure deficit and applying Meyer's empirical constant.

3. Importance Of Mean Wind Velocity Calculation

Details: Accurate wind velocity estimation is crucial for hydrological modeling, evaporation studies, water resource management, and climate research applications.

4. Using The Calculator

Tips: Enter evaporation loss in meters, Meyer's constant (typically 1.1 or 1.5), maximum vapour pressure and actual vapour pressure in cm Hg. All values must be valid (positive values with V > v).

5. Frequently Asked Questions (FAQ)

Q1: What Are Typical Values For Meyer's Constant?
A: Meyer's constant is typically 1.1 for deep water bodies and 1.5 for shallow water conditions.

Q2: How Accurate Is Meyer's Formula?
A: Meyer's formula provides reasonable estimates for mean wind velocity but may require local calibration for specific conditions and regions.

Q3: What Units Should Be Used For Vapour Pressure?
A: Vapour pressure should be measured in centimeters of mercury (cm Hg) for consistency with the formula.

Q4: When Is This Formula Most Applicable?
A: The formula is most applicable for monthly evaporation studies and hydrological calculations where wind velocity data is limited.

Q5: Are There Limitations To This Formula?
A: The formula may be less accurate in extreme weather conditions, complex terrain, or when local factors significantly influence evaporation rates.