Difference between revisions of "Evapotranspiration"
Jump to navigation
Jump to search
Jenny Hill (talk | contribs) m |
Jenny Hill (talk | contribs) m |
||
| Line 9: | Line 9: | ||
Step 2. Calculate the annual heat index (I): | Step 2. Calculate the annual heat index (I): | ||
<math>I=\sum_{i=1}^{12}i</math> | <math>I=\sum_{i=1}^{12}i</math> | ||
Step 3. Calculate an uncorrected Potential Evapotranspiration (PET<sub>uncorrected</sub>): | |||
<math>PET_{uncorrected}=1.6\cdot \left ( \frac{10\cdot T}{I} \right )^{\alpha }</math> | |||
where: α = 6.75 x 10<sup>-7</sup>''I<sup>3</sup>'' - 7.71 x 10<sup>-5</sup>''I<sup>2</sup>''+ 0.0179''I'' + 0.49 | |||
Revision as of 16:21, 8 January 2018
Thornthwaite Mather method[edit]
Step 1. Calculate the monthly heat index (i): where: T = mean monthly temperature.
Step 2. Calculate the annual heat index (I):
Step 3. Calculate an uncorrected Potential Evapotranspiration (PETuncorrected):
where: α = 6.75 x 10-7I3 - 7.71 x 10-5I2+ 0.0179I + 0.49