20.3.2.d. Combination Method (Penman Equation)

Try these first

1. 1.

   What does ET stand for?

   Hint

   Think about the processes of water loss from soil and plants.

2. 2.

   Name one component of the Penman Equation.

   Hint

   Components are usually related to energy or air properties.

3. 3.

   What does the Penman Equation estimate?

   • Soil moisture
   • Evapotranspiration
   • Soil temperature

   Hint

   Consider what happens to water in the soil and atmosphere.

4. 4.

   True or False: The Penman Equation combines energy balance and aerodynamic methods.

   • True
   • False

   Hint

   Think about the different methods discussed.

5. 5.

   A recent study in a dry region used the Penman Equation to estimate ET during a drought. Given the net radiation was 200 W/m², soil heat flux was negligible, and the wind speed was 3 m/s with a vapor pressure deficit of 1 kPa, calculate the estimated ET.

   Hint

   Carefully substitute the values into the Penman Equation.

6. 6.

   Consider a scenario where an increase in wind speed leads to a noticeable change in ET rates. Discuss how this reflects in the Penman Equation and propose potential strategies for mitigating water loss.

   Hint

   Think about how physical barriers might influence wind dynamics.