Identification and On-line Estimation of the Unsaturated Hydraulic Conductivity in Presence of Forced Air Convection Based on a Distributed-Parameter Model

Schoefs, Olivier;Dochain, Denis;Chapuis, R.;Perrier, Michel
(2003) 13th IFAC Symposium on System Identification (SYSID) — Location: Rotterdam (27.August.2003)

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Authors
  • Schoefs, OlivierUTC
    Author
  • Dochain, DenisUCLouvain
    Author
  • Chapuis, R.Ecole Polytechnique de Montréal
    Author
  • Perrier, MichelEcole Polytechnique de Montréal
    Author
Abstract
The goal of this study was to calibrate a numerical model aimed at describing simultaneous air and water flow in soil and, to build a model-based estimator of the unsaturated hydraulic conductivity. The experimental approach consisted of infiltration tests in a 1.5m high column of loamy sand. The numerical model correctly described water percolation without air convection, provided parameter adjustment of the predictive model of the unsaturated hydraulic conductivity was performed. An observer-based estimator was able to estimate on-line the hydraulic conductivity in steady-state but faced oscillation problems in unsteady-state. The difficulty in implementing the software-sensor can be explained by the strong nonlinearity of the dynamical model.
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Schoefs, O., Dochain, D., Chapuis, R., & Perrier, M. (2003). Identification and On-line Estimation of the Unsaturated Hydraulic Conductivity in Presence of Forced Air Convection Based on a Distributed-Parameter Model. IFAC Proceedings, 36(16), 1945-1950. https://hdl.handle.net/2078.5/60208 (Original work published 2003)