Avaliação de irrigação por sulcos abertos em declive através de simulação algébrica.

Abstract

This research deals with a mathematical model developed by LEV1EN & SOUZA (1987) using computational tools especially applied for performance analysis of opened furrow irrigation systems with uniform slope. The shape factors influence on advance phase and recession curve effect on global evaluation of furrow irrigation have been discussed through a comparison of simulated results to experimental data from RAMSEY (1976) and Agricultural and Chemical Engineering Department of Colorado State (1979). The results have shown the feasibility of shape factors fitting from analytical expression based on volume balance analysis, besides the applicability of the shape factors recommended by the literature and those obtained from weighed average in the advance phase simulation. In prediction of the recession phase, a better performance can be met for short furrows (smaller than 200 meters); however, for long furrows analysis (larger than 200 meters), an instantaneous recession condition must be considered in order to have an adequate simulation.