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Numerical Analysis of Passive Capillary Wick Samplers prior to Field Installation

Soil and Water Management, Katholiek Universiteit Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium

Jan Vanderborght

Agrosphere, ICG-IV, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

View larger version (70K): [in this window] [in a new window]   Fig. 1. Reality compared to the three-dimensional axisymmetrical modeled flow domain (vertical cut) and boundary conditions (l_Wick = length of the wick). The arrow indicates the axis of symmetry around which the model is rotated.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Simulated cumulative leachate volumes sampled by (a) the Amatex 3/8-inch high-density wick (AM 3/8 HI) and (b) the Pepperell -inch wick (PEP1/2) during a 3-yr period compared with the reference.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Hydraulic conductivity functions of the three soil horizons (Ap, Bt, and B32) and the two wick types (Amatex 3/8-inch high-density [AM 3/8 HI] and Pepperell -inch [PEP 1/2]).

View larger version (15K): [in this window] [in a new window]   Fig. 4. Simulated daily leachate volumes sampled by a 30- and 100-cm long Amatex 3/8-inch high-density (AM 3/8 HI) wick in (a) a wet period and (b) a dry period compared with the reference.

View larger version (31K): [in this window] [in a new window]   Fig. 5. Simulated (top) soil tension and (bottom) moisture content at 1 cm above 30- and 100-cm long Amatex 3/8-inch high-density (AM 3/8 HI) wicks in (a) a wet period and (b) a dry period compared to the reference.

View larger version (71K): [in this window] [in a new window]   Fig. 6. Two-dimensional modeled flow domain (vertical cut) and schematization of the inner boundary condition.

View larger version (34K): [in this window] [in a new window]   Fig. 7. Water flow velocity vectors around a double-ring wick sampler with an inner seepage-face boundary condition

View larger version (32K): [in this window] [in a new window]   Fig. 8. Top view of the layout of the wick sampler (dashed lines represent the unravelling of the wicks).