Water Temperature

[gemeda]

Dear Freinds,

I want to apply Dalton formula to compute evaporation rate from the reservoir.However,I need water temprature data which I dont have on hand.Can you tell me how to estimate or reasonably guess the water temperature from the air temperature?

Dalton Equation,

E=b.v.(es-ea) in mm/d
b wind factor from Figure 4.3
v mean wind speed at 2m height
es saturated vapour pressure at water temperature Tw of
the waterbody(reservoir)
ea actual vapour pressure at air temperature
E evaporation in mm/d


Thank you,

 

[msquared48]

Without climatological data, I don't know how you can.

It depends on the depth of the body of water, lateral and vertical mixing, relative quantities of water (reservoir and inflow), side stream inflow, etc., etc., etc.,...

Very site specific...



Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[gemeda]

thank you msquared48,

there is climate data and the evaporation can be computed using other methods such as aerodynamic method.However,I want to compute the evaporation using Dalton Formula for comparison.I am looking for some technical concepts to reasonably guess the water temprature from the air temperature and/or other climate data.