Parameter Including Wind Velocity and Saturation Deficit Calculator

Formula Used:

\[ Ea = \frac{PET \times (A + \gamma) - (A \times Hn)}{\gamma} \]

Daily Potential Evapotranspiration (PET):

mm/day

Slope of Saturation Vapour Pressure (A):

mmHg/°C

Psychrometric Constant (γ):

Net Radiation of Evaporable Water (Hn):

mm/day

Parameter of Wind Velocity and Saturation Deficit (Ea):

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1. What is the Parameter of Wind Velocity and Saturation Deficit?

The Parameter of Wind Velocity and Saturation Deficit (Ea) is a meteorological parameter used in evapotranspiration calculations that combines the effects of wind speed and atmospheric moisture deficit on evaporation rates.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Ea = \frac{PET \times (A + \gamma) - (A \times Hn)}{\gamma} \]

Where:

\( PET \) — Daily Potential Evapotranspiration (mm/day)
\( A \) — Slope of Saturation Vapour Pressure (mmHg/°C)
\( \gamma \) — Psychrometric Constant
\( Hn \) — Net Radiation of Evaporable Water (mm/day)

Explanation: This formula calculates the parameter that incorporates both wind velocity effects and saturation deficit in evapotranspiration models.

3. Importance of Ea Calculation

Details: Accurate calculation of Ea is crucial for precise evapotranspiration estimation, which is essential for irrigation planning, water resource management, and agricultural productivity assessment.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure values are positive and within reasonable ranges for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for Ea values?
A: Ea values typically range from 0 to 10 mm/day, depending on climatic conditions and geographical location.

Q2: How does wind velocity affect Ea?
A: Higher wind velocities increase evaporation rates by removing moist air from evaporating surfaces, thus increasing Ea values.

Q3: What is saturation deficit and how does it influence Ea?
A: Saturation deficit represents the difference between actual and saturation vapor pressure. Larger deficits increase evaporation potential and thus Ea values.

Q4: When is this parameter most commonly used?
A: This parameter is primarily used in agricultural meteorology, hydrology, and environmental studies for evapotranspiration modeling.

Q5: Are there limitations to this calculation method?
A: The accuracy depends on the quality of input data and assumes certain standard conditions. Local calibration may be needed for specific regions.