نمون سازي جبهه رطوبتي خاك از منبع تغذيه خطي در آبياري قطره اي - نواري

Soil Wetting Front Modeling of Line Source in Drip-Tape Irrigation

Determination of wetted soil diameter and depth at different times after irrigation commencement is very important for irrigation design. The shape and dimension of wetting front is depended on soil texture, soil hydraulic conductivity, drip discharge and so on. The purpose of this study was to develop some empirical equation for determination of welting front dimensions at different lime after irrigation commencement. This study was undertaken in a plexiglass box with metal frame, dimension of 1.8 x I .2 x O.9m from which one quarter was omitted. Wetting from dimension were measured after irrigation commencement at different times, using depicted lines on side walls of the model. In additional some functions were derived using Backingham 1I theorem. dimension analysis and effective physical parameters on wetted soil volume. The derived functions were calibrated base on some measured data which showed a good agreement with the lab results. This indicates that the derived empirical functions could he used properly for designing tape irrigation system.