SENSITIVITY ANALYSIS OF PARAMETERS OF BORDER IRRIGATION MODELS

Six models of border irrigation, viz. Jobling-Turner, Strelkoff, Walker, Jaynes, Schmitz and Ross, were evaluated for their sensitivity to the input parameters. The parameters selected were (i) solution parameters: time step and grid size, and (ii) field parameters: longitudinal slope, the Manning n, parameters of the infiltration equation and inflow rate. The values of the solution parameters were varied between -90 and +233% of the values in the control simulation and those for the field parameters between -50 and +50%. The analysis shows that, for the variation of the parameters considered, the models were not sensitive to the solution parameters but that they were sensitive to varying degrees to the field parameters. © 1990.