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Using TDR and Inverse Modeling to Characterize Solute Transport in a Layered Agricultural Volcanic Soil

^a Instituto Canario de Investigaciones Agrarias (ICIA), Apdo. 60, 38200, La Laguna, Spain
^b Agricultural and Biological Engineering Dep., University of Florida, 101 Frazier Rogers Hall, P.O. Box 110570, Gainesville, FL 32611-0570
^c Dep. of Environmental Sciences and Land Use Planning, Unité Génie Rural, Université Catholique de Louvain, Croix du Sud, 2, BP2, B-1348 Louvain-la-Neuve, Belgium

View larger version (27K): [in a new window]   Fig. 1. Experimental set-up for transport experiments in the volcanic soil monolith.

View larger version (15K): [in a new window]   Fig. 2. Breakthrough curves observed at the middle of the monolith (Depth D) by TDR (lines) and solution extractors (each with a different symbol).

View larger version (21K): [in a new window]   Fig. 3. Correlation between values measured in the suction extractor samples and estimations obtained with the TDR.

View larger version (20K): [in a new window]   Fig. 4. Average breakthrough curves at the seven observation depths and on effluent. Breakthrough curves were obtained from TDR (symbols) and simulated by the WAVE model with CDE (solid lines), and with MIM (dashed lines).

View larger version (16K): [in a new window]   Fig. 5. pH of the soil solution extracted at the different depths considered. Dashed lines indicate the general range of pHzpc for Fe and Al oxihydroxides (pH = 7–9).