Ceramic patch type subsurface drip irrigation line: Construction and hydraulic properties

Abstract

In subsurface irrigation, emitter orifices can become clogged by root intrusion. Using the technologies of subsurface drip irrigation, porous ceramic moulding and 3D printing, a new ceramic patch type subsurface drip irrigation line (CP-SDIL) with a simple structure was developed. The CP-SDIL consists of a plastic pipe, a plastic patch, a porous ceramic water-seepage pad and a rubber leakage-proof gasket. The CP-SDIL discharge can be adjusted by changing the material of the ceramic water-seepage pad which is the core component. The CP-SDIL pressure–discharge relationship is linear, and the flow region index is one. The working pressure and the ceramic materials had a significant influence on the discharge of water from the CP-SDIL into the soil. The higher the ceramic porosity and the working pressure, the larger the discharge and the movement of the wetting front. Based on a theoretical analysis and using the reference value for the soil saturation zone radius, an equation for calculating the discharge from CP-SDIL into the soil was developed. The results of this study can be used as a reference for the promotion and application of CP-SDIL.