Click on image to view larger version.
Fig. 1. Experimental setup. (a) Annex system. The recharge reservoirs supply fluid to the upstream reservoir of the tank. The overflow system of the primary recharge reservoir connected to the secondary recharge reservoir allows the inflow rate to be constant. The secondary reservoir feeds the primary reservoir continuously due to pumping. Fluid flowing out of the sand box is collected by the recovery reservoir. The recovered fluid is reinjected in the secondary recharge reservoir, so the entire system constitutes a closed hydraulic circuit. (b) Seepage configuration. The levels of the upstream and downstream reservoirs are maintained at fixed values using the upstream clamp and the downstream overflow system. The water level difference generates a two-dimensional flow field through the porous medium, in which the measurements electrodes are planted. (c) Darcy configuration. The tank is tilted, and the levels of the upstream and downstream reservoirs are maintained at the same value. Flow through the porous medium is hence one-dimensional.
