Desenvolvimento de um "software" para o desenvolvimento de sistemas de irrigação por sulcos via balanço de volume

Abstract

The objetive of this work was the development of a computer program named SIDIS, to design gradient open furrow irrigation systems with three options (conventional, with flow reduction and with reuse of runoff water), using the balance of volume model. The study was done in two stages: first the design of the software and second the validation of the program. The software was written in TURBO PASCAL version 7.0 and consists of seven programs: l) SIDIS, the main program that manages and controIs the others; 2) SDISC that designs the irrigation systems of common furrows; 3) SDISR, that designs systems with cut-back inflow; 4) SDIST, makes calculations for systems with reuse of runoff water; 5) SAIS, that makes the irrigation analysis; 6) SLAR, that makes the reading and recording of the data from the other programs and 7) SPAAS, that is the users help program. For the validation of the software, were used data obtained by others researchers and data from the "Morada Nova" irrigations project. The results obtained in the simulations indicate that the balance of volume model gives a good approximation to the field situation and the differences are given to the spatial and temporal variability of the soil infiltration characteristics. AIso, from the design viewpoints, the empirical parameters expressing the furrows shape can be considered constant. For the case of the furrows with cut-back infIow, in most cases the system's performance was increased. But for certain soils, the methodology proposed by GARTON (1966) is useIess. Regarding the systems with reuse of runoff water, they show the best application efficiency indexes, but the performance was low for certain conditions Iike very Iong furrows or sandy soils. Concluding, we can say that the SIDIS program behaved well as a tool to simulate and design furrow irrigation system.