Back To ASIM User Forum | Submit A Message | Reply To This Message
From: laila bahgat
I'll very much appreciate any clarification about the following issue: In model ASM3 copy published in Wat. Res. Vol.39, No.1, PP. 183-193, 1999. Gujer et al., provided a temperature interpolation function to interpolate the values of model parameters at any given temperature using the default values given in this paper for the parameters at 10 and 20 degrees centigrade. However when I tried to compute parameter values at temperature = 15, I got unrealistic values, probably due to some mistake in computing the term theta. I think this term should be computed using the relation given in the paper as: ln(k(T1)/k(T2))/T1-T2 Then the main function is: k(T) = k(20c).exp(theta.(T-20)) i.e. I understood k(T1) as the parameter value at T1= 10 and k(T2) as the parameter value at T2=20. Example: for a paramter whose values at temperatures= 10, 20 respectively = 0.05 0.1 theta would be 13.86294361 k(15)= 7.88861E-32 This I think is not correct. So what went wrong in my computations? Thank you.
Please don't bother responding to the earlier message. The erroneous results were due to a trivial mistake in coding theta in Excel. Thank you.