How can I plot GMWL, LMWL and and Evaporation line using stable isotopes values?
I know to how to draw LWML line using stable isotope (O-18 and H-2) readings of rainfall of a particular area.
But, Please let me know to which values should be used draw to GWML and evaporation or mixing line on the same plot.
regards,
The GMWL is simply dD = 8*d18O + 10
Evaporation lines can be derived from the Craig-Gordon model for a given set of values of air relative humidity, temperature... assuming source water lies on the LMWL and atmospheric vapour is in isotopic equilibrium with that source. But this would be only theoretical evaporation lines...
add few random values( like 10, -10 and 0 to d18O) to crigg equation 8*d18O +10 will be the GMWL and the rainfall data value will be the LMWL. the apttern decide the mixing
If I understand your question, I agree with Deljo Davis. If you know the equation of your Local MWL you can set few values for d18O and in this way you can find the related dD. When you obtain 3 points you have you line...
I agree with Deljo Davis, We must first construer line to Criag equation 8 * 10 d18O + 10 will be GMWL taking the oxygen-18 values (like 0, -10 and -15). If there is an evaporation point you will be right and bottom of the line GMWL. But this would be only theoretical evaporation lines..
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