Water evaporation, temperature, wind and heat capacity?

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SUMMARY

The discussion focuses on the factors influencing water evaporation in a large pool, specifically the effects of wind, temperature, and water's heat capacity. Key equations mentioned include Penman's equation and Shuttleworth's formula, which are used to model evaporation rates. The conversation highlights the importance of surface water temperature, noting that water at 23°C evaporates more readily than at 13°C. Additionally, the presence of wind barriers is discussed as a factor that can decrease evaporation by limiting wind exposure on the water surface.

PREREQUISITES
  • Understanding of Penman's equation for evaporation modeling
  • Familiarity with Shuttleworth's formula for heat and mass transfer
  • Knowledge of the relationship between temperature and vapor pressure
  • Concept of heat capacity variations in water across temperature ranges
NEXT STEPS
  • Research the application of Penman's equation in different environmental conditions
  • Explore Shuttleworth's formula and its implications for evaporation rates
  • Investigate the impact of wind speed on evaporation in open water bodies
  • Study the effects of temperature variations on vapor pressure and evaporation
USEFUL FOR

Environmental scientists, hydrologists, and anyone studying the dynamics of water evaporation in relation to climatic factors and physical barriers.

Alfreds9
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Hi,

I'd like to know how I'd put together, either elegantly or at least in physical terms, that surely water evaporation in a large pool of V volume and S surface is influenced by wind (increased by it as opposed to having side barriers), temperature (increased by direct sunlight as opposed to shading due to the very same barriers shielding wind laterally) and water's heat capacity not being constant across its temperature range.

I am thinking about Penman's equation (or Shuttleworth's) fitting above needs however I am not sure if it'd still stand true for my example, since I don't fully grasp how much would superficial water heated more by sunlight than its shaded counterpart rise up the vapor pressure and hence speed up evaporation of water and also how to put that a wind side barrier would decrease the net evaporation by decreasing wind on water surface and also having sunrays hit directly water only about at zenith.

I apologize for the awful teeny drawings, I am on mobile without any graphic tablet or computer.

Thank you

Allison

2cx7pv.jpg
 
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You've Googled Penman's. What are the results?
 
Bystander said:
You've Googled Penman's. What are the results?

The results are that I unfortunately still don't see where does surface water temperature (due to high irradiation VS low irradiation) comes into play in either Penman's or Shuttleworth's formula. I am quite sure that, considering everything else equal, water at say 23°C evaporates more readily than water at say 13°C.
 

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