Search found 5 matches

by John
Wed May 21, 2008 3:50 pm
Forum: Hydrus 1D
Topic: Hargreaves PET calculations & specified Ra
Replies: 3
Views: 2129

Hello, Dr. Simunek. The Hargreaves PET and extraterrestrial radiation (Ra) equations cited in the version 4 manual correctly reproduce the standard (unmodified) equations. Altitude, however, is not an input to either of these, although it can be an important input to the Penman-Monteith PET approach...
by John
Tue May 20, 2008 8:05 pm
Forum: Hydrus 1D
Topic: Hargreaves PET calculations & specified Ra
Replies: 3
Views: 2129

Hargreaves PET calculations & specified Ra

Hello, Dr. Simunek. I hope all is well with you. Thank you for the new version of HYDRUS-1D, particularly the new dual permeability and PET options. We have used the Hargreaves equation for a number of our sites over the last several years, so I am glad that you have added that capability. Unfortuna...
by John
Thu Jun 30, 2005 12:14 am
Forum: Hydrus 1D
Topic: Mass balance check: Balance.out vs. T_Level.out
Replies: 8
Views: 3725

Mass balance check: Balance.out vs. T_Level.out

Gentlemen, I am using HYDRUS-1D (thanks for the improvements!) to estimate daily net infiltration rates (either + or -) at ground surface using daily precip and PE rates via the atmospheric boundary condition (0 surface layer and precip rates are too low to generate runoff). The results are to be us...
by John
Sat Mar 16, 2002 7:16 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Flowing Particles
Replies: 3
Views: 3599

Hello, all. This flowing particles option caught my eye because I am planning a particle tracking analysis of my steady state modeling results. Will this option provide true particle tracking information, such as each particle's path in time, and total time of travel through the domain? If so, which...
by John
Sat Mar 16, 2002 5:42 pm
Forum: Hydrus 2D (old version 1996 - 2005)
Topic: Tips for attaining steady state solutions
Replies: 1
Views: 3021

Tips for attaining steady state solutions

Hello. In the hopes of validating our 2D problems with earlier 1D steady-state solutions, I have recently tried using the steady state solution switch. This is activated, I believe, by unchecking the water flow box in the preprocessor's Main submenu. Does anyone have any advice on helping the solver...