2-DIMENSIONAL SIMULATION OF BASIN IRRIGATION .2. APPLICATIONS

The development of a two-dimensional hydrodynamic simulation model of basin irrigation is reported in a companion paper. This article presen ts four applications of the model. Two hypothetical case studies are u sed to illustrate the ability of the model to accommodate multiple inf lows and irregular field shapes including internal high spots. The mod el is applied to study the effect of field shape on irrigation perform ance. The particular case of a rectangular basin irrigated from a corn er is considered. Results show that one-dimensional models can underes timate the time of advance by up to 20%. Finally, the model is applied to explore the effects of spatially varied infiltration on irrigation performance. A series of infiltration observation points is used to e stimate the infiltration rate in unmeasured locations. The model is us ed to simulate a hypothetical case study involving the design of a squ are level-basin irrigation field with spatially varied infiltration ir rigated from a corner. Results show that irrigation performance change s dramatically with the location of the corner inflow.