Hi, I callibrated HYDRUS for a drain and then run it for long-time, then concentration in some long-time cases became negative in some places, what is mean? can somebody please help me with this.
A discussion forum for users of the new HYDRUS 2D/3D. HYDRUS is a software package for simulating water, heat and solute movement in two- and three-dimensional variably saturated media. Happy Posting!
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The negative concentrations are likely the results of the oscillatory behavior of the numerical solution. See Chapter “6.4.6. Oscillatory Behavior” of the Technical Manual on how to avoid numerical oscillations (e.g., use options such as upstream weighting, artificial dispersion, or the performance index). J.