Abstract
The effect of initial water content on water transport characteristics in injection irrigation is analyzed through an indoor experiment of injection irrigation in different initial water contents. The research shows the following results. The relationship between the cumulative infiltration and time accords with power function. The higher the initial water content is, the bigger the cumulative infiltration is in the same time. The wetting front is a semi-circle with its center below the water outlet, the transport velocity of which slows down with the passing of time. The transport velocity of vertical section crossing the middle of the two outlets approaches that of vertical section at the middle point of the central line of the two outlets. The higher the initial water content is, the shorter the time of the transport velocity of the two sections similar to each other is. The water wetted range is comparatively wider, and the water content is comparatively higher below the outlet, and it is reverse above the outlet. The higher the initial water content is, the wider the wetted range is and the higher the water content of the soil being the same distance from the outlet is. The above research provides a basis for supplementing the theories and technologies of injection irrigation.
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