Inverse method for determining soil hydraulic functions from one-step outflow experiments
1992
Dam, J.C van | Stricker, J.N.M. | Droogers, P.
Optimization of the parameters describing the soil hydraulic functions theta(h) and kappa(h), in which theta is the volumetric water content, h is the soil water pressure bead, and kappa is the unsaturated hydraulic conductivity, in a transient-flow experiment is a promising method to derive soil hydraulic information. Laboratory outflow experiments are a typical example. However, estimates from one-step outflow experiments, using only cumulative outflow data in the objective function, are often unreliable and non-unique. Using the MVG model for theta(h) and kappa(h), the sensitivity of parameters to outflow data is shown to depend on their actual values. The one-step outflow method was applied on samples of four soils of different texture. Additionally, the soil hydraulic functions of these soils were measured by alternative, direct methods. From the validation, it appeared that cumulative out-flow data have to be supplemented with theta(h) data to get reliable estimations.
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