MODEL TO EVALUATE THERMAL EFFECTS ON THE HYDRAULIC FUNCTIONING OF DRIP IRRIGATION SYSTEMS
Regional and seasonal thermal variations may affect the hydraulic functioning of a specific drip irrigation system, which in turn, changes the irrigation uniformity. A semi-empirical model was developed to evaluate the effect of thermal variables on the hydraulic functioning of lateral drip irrigation lines. A computer program was developed also to make calculations. With this program and this model, 18 thermal cases were simulated involving three drip emitters: Drip Eze DPD 2, Rex Netafim and Emiter E-2; two thermal conditions: a maximum with a radiation of 500 W m-2 and a minimum with 10 W m-2; and three lengths of lateral lines: 50, 100 and 150 m. The results of the simulation indicated that the hydraulic regimen in the lateral line is always variable and decreasing along it, and that drip emitters are most affected when the thermal radiation is maximum, when the drip emitter functions in the laminar regimen and the lengths of the lateral lines are large. In all the analyzed cases, the discharge of the drip emitter was greater when the thermal effect was considered.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Colegio de Postgraduados
1999
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| Online Access: | https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1602 |
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| Summary: | Regional and seasonal thermal variations may affect the hydraulic functioning of a specific drip irrigation system, which in turn, changes the irrigation uniformity.
A semi-empirical model was developed to evaluate the effect of thermal variables on the hydraulic functioning of lateral drip irrigation lines. A computer program was developed also to make
calculations. With this program and this model, 18 thermal cases were simulated involving three drip emitters: Drip Eze DPD 2, Rex Netafim and Emiter E-2; two thermal conditions: a maximum
with a radiation of 500 W m-2 and a minimum with 10 W m-2; and three lengths of lateral lines: 50, 100 and 150 m. The results of the simulation indicated that the hydraulic regimen in the
lateral line is always variable and decreasing along it, and that drip emitters are most affected when the thermal radiation is maximum, when the drip emitter functions in the laminar regimen
and the lengths of the lateral lines are large. In all the analyzed cases, the discharge of the drip emitter was greater when the thermal effect was considered. |
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