A METHOD DESCRIBING PRECISE WATER APPLICATION INTENSITY UNDER A CPIS FROM A LIMITED NUMBER OF MEASUREMENTS

摘要

Centre pivot irrigation systems are known for their irrigation distribution performance potential.rnUnfortunately the performance analysis of centre pivot irrigation systems is often restricted tornthe uniformity of distribution. Depending on the characteristics of the applied rainfall, a systemrndesigned for high uniformity does not guarantee a high application efficiency once the system isrnin operation.rnA method is proposed in the present paper to analyse the average rainfall depth of applicationrnand kinetic energy delivered to the soil by individual droplets all over the machine.rnThe method requires water distribution profiles, the distribution of droplet size and velocityrnalong the radius of coverage for any nozzle, and pressure and height of the emitter installed onrnthe machine. Considering the number of nozzles and the range of pressure applied, there is thernneed for a method calculating: the emitter maximum radius of coverage, then the rainfallrndistribution profile, then the droplet distribution and finally the associated kinetic energyrndelivery. These parameters are calculated on a new model of classical design sprayers proposedrnby IWT Company.rnThese results are being integrated on a centre pivot nozzle chart design software presented in thernposter session.