The areal distribution of applied water above and below soil surface under center pivot sprinkler irrigation system

摘要

In this study an evaluation of the areal distribution of applied water above and below the soil surface for six center pivot systems was conducted under field conditions, to quantify the subsurface distribution of soil water content and water application on the ground surface. The measured application depth of water and water distribution patterns with the distance from the pivot were presented. Field experimental results showed evidence of the importance of redistribution of the applied surface water. The values of the subsurface uniformity coefficients were higher by approximately 12% than the surface values. It was found that the water within the soil is more uniformly distributed than that applied above the soil surface. An experimental relationship between the uniformity coefficients above and below the soil surface was derived under center pivot sprinkler irrigation systems.