Evaporation Computation Algorithm

EFDC_Explorer
1

What is the algorithm/method used for computing evaporation internally by EE in ASER.inp?

Thanks,
Rumana

2
dumby08 wrote: What is the algorithm/method used for computing evaporation internally by EE in ASER.inp?

Thanks,
Rumana

Hi Rumana,

In EFDC Evaporation is calculated as follows. FIrst of all wind speed function is calculated as
FW=9.2+0.46*WINDST(L)**2;
and the the evaporation is calculated as
RE=FW*(SVPW-VPA(L));
where SVPW = saturation vapor pressure in mb based upon the water surface temprature
WINDST = wind speed at 10 metres over cell surface (m/s)
VPA = vapor pressure of air at near surface air temperature (mb).

The more details about evaporation and other heat related parameters can be found on CALHEAT.for subroutine. I hope this helps.

Thanks.

John
3

Thanks a lot.
I must say you are a genius in EFDC.

Rumana

4

Thank you for your kind words. I have a lot more to learn in EFDC. Glad I could help you.