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Intercomparison of Flow and Transport Models Applied to Vertical Drainage in Cropped Lysimeters

^a Agrosphere Institute ICG-IV, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
^b Bureau de Recherches Geologiques et Minieres, BRGM, Avenue Claude Guillemin F 45060 Orleans Cedex 02, France
^c ISRN\DPRE\SERLAB\LMODE, CEN Cadarache 13115 St Paul-Lez-Durance, France
^d Laboratoire d'etude des Transferts en Hydrologie et Environnement, LTHE (UMR CNRS 5546, UJF, INPG, IRD), BP53, 38041, Grenoble CX 09, France

View larger version (39K): [in a new window]   Fig. 1. Measured atmospheric conditions and calculated reference evapotranspiration rates during the experimental period.

View larger version (32K): [in a new window]   Fig. 2. Isoline plot of soil temperature and moisture dependent DT50 for methabenzthiazuron (MBT) calculated according to Graham-Bryce (Wüstemeyer, 2000) and Boesten and van der Linden (1991), with reference DT50 = 162 d, ref = 0.39 cm3 cm–3, = 0.01 K–1, ß = 0.2, and Tref = 20°C (Eq. [6]). Volumetric water contents were transformed to gravimetric values using a topsoil bulk density of 1.57 g cm–3.

View larger version (13K): [in a new window]   Fig. 3. Cumulative measured and predicted actual evapotranspiration rates. Bars indicate standard deviations of the measurements.

View larger version (42K): [in a new window]   Fig. 4. Measured and predicted soil moisture contents at two depths. Bars indicate standard deviations of the measurements.

View larger version (13K): [in a new window]   Fig. 5. Cumulative measured and predicted drainage rates. Bars indicate standard deviations of the measurements.

View larger version (25K): [in a new window]   Fig. 6. Measured and predicted soil temperatures at 10 cm depth.

View larger version (17K): [in a new window]   Fig. 7. Measured and predicted methabenzthiazuron (MBT) residues (applied MBT = 100%) (a) 252 d and (b) 627 d after application.

View larger version (20K): [in a new window]   Fig. 8. Precipitation and measured and predicted accumulated mass of methabenzthiazuron (MBT) in the drainage water. MBT application was at t = 0.