Using Hydrus 2-D Simulation model to evaluate wetted soil volume in subsurface drip irrigation systems.

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Drip irrigation is considered one of the most efficient irrigation systems. Alternatively to the traditional drip irrigation systems,laterals can be installed below the soil surface. Realizing the subsurface drip irrigation SDI , which recently has been increasing in useas a consequence of advances in plastics technology, making SDI equipment more affordable and long lasting. Due to its potential highefficiency SDI may produce benefits, especially in places where water is a limited source. As the use of SDI is relatively new, a betterunderstanding of the infiltration process around a buried point source can contribute to increased water use efficiency and consequentlythe success of drip irrigation system. In addition, proper design and management of such a system needs the judicious combination of dripspacing, discharge rates, irrigation duration and time interval between consecutive irrigations. To this aim, numerical models can representa powerful tool to analyze the evolution of the wetting pattern during the distribution and redistribution processes, in order to explore SDImanagement strategies, to set up the duration of irrigation, and finally to optimize water use efficiency. In the paper the suitability of theHYDRUS-2D simulation model is verified, at the scale of a single emitter, on the basis of experimental observations, with the aim toassess the axis-symmetrical infiltration process consequent to subsurface drip irrigation. The model was then applied in order to evaluatethe main dimensions of the wetted soil volume surrounding the emitter during irrigation as a function of time and initial soil water content.The investigation, carried out in a sandy-loam soil, showed the suitability of the model to well simulate infiltration processes around anemitter during irrigation. Model application allowed also, for the examined soil, to evaluate the emitter spacing accounting for themaximum soil depth to irrigate.
Lingua originaleEnglish
pagine (da-a)342-349
Stato di pubblicazionePublished - 2007

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.2300.2312???
  • ???subjectarea.asjc.1100.1101???


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