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Beerkan Estimation of Soil Transfer Parameters through Infiltration Experiments—BEST

^a Laboratoire des Sciences de l'Environnement, Ecole Nationale des Travaux Publics de l'Etat, Rue Maurice Audin, 69518 Vaulx-en-Velin (France); L. Lassabatère currently at: Division for Water and Environment, LCPC Nantes, Route de Bouaye, BP 4129, 44341 Bouguenais cedex, France
^b Laboratoire d'Etude des Transferts en Hydrologie et Environnement, LTHE (UMR 5564, CNRS, INPG, IRD, UJF), BP 53, 38041 Grenoble Cedex 9 (France)
^c Bioengineering Dep., Oregon State Univ., 116 Gilmore Hall, Corvallis, OR 97331-3906, USA, I. Braud currently at: CEMAGREF, UR Hydrologie-Hydraulique, 3bis Quai Chauveau, 69336 Lyon Cédex 9 (France)

View larger version (154K): [in a new window]   Fig. 1. Beerkan infiltration. Known volumes of water prepared in the cups are successively poured through the ring and time is measured.

View larger version (18K): [in a new window]   Fig. 2. Particle-size distributions of the soils studied (<2 mm). Experimental data (points) and modeling (solid lines).

View larger version (27K): [in a new window]   Fig. 3. Modeling with BEST/I cumulative infiltration rate for the three soils ([a] Roujan, [b] Chernobyl, [c] Django Reinhardt).

View larger version (14K): [in a new window]   Fig. 4. Example of BEST estimation of the (a) sorptivity (S) and hydraulic conductivity (Ks) and (b) longest time of the data subset (tk) and maximum time (tmax) versus the number of points used for the fit (k) for the case of Chernobyl.

View larger version (25K): [in a new window]   Fig. 5. Examples of inadequate modeling: (a) overestimation of steady state infiltration rate (CI method applied to Roujan) and (b) overestimation of transient cumulative infiltration (IF and BEST/q methods applied to Chernobyl).

View larger version (19K): [in a new window]   Fig. 6. Soil hydraulic characteristics curves: (a) water retention curve h() and (b) hydraulic conductivity K().