Laboratory Study of Moisture Distribution in Surface and Subsurface Drip Irrigation Systems

Document Type : Original Article

Authors

1 Irrigation and Drainage Training Department / Faculty of Agriculture and Natural Resources / Arak University / Arak City / Iran

2 Assistant professor, Water Science & engineering department, Faculty of Agriculture & Environment, Arak University, Arak, Iran

3 Assistant Professor,, Department of Water Sciences and Engineering, Faculty of Agricultural and Environment, Arak, Iran

Abstract

Soil moisture distribution is affected by various factors such as discharge and the type of irrigation systems. In this study, it is tried to compare the horizontal and vertical distribution of moisture, redistribution of moisture in the soil and the wetting area at the end of irrigation in two surface and subsurface drip irrigation systems. For this purpose, an experiment in the form of a glass physical model with dimensions of 1 × 0.5×1.20 m, two installation depths (0 and 30 cm) and three discharges (Q1=2, Q2=4 and Q3=8 liters/hour) for sandy soil texture was performed during six hours of irrigation as factorial and in a completely randomized design. Irrigation moisture redistribution was investigated after 68 hr. The results showed that in the subsurface drip system with doubling and quadrupling the discharge, the wetting area increased to three and five times, but in the surface system it changed to two and four times, respectively. Also, changes in moisture redistribution in the subsurface drip system have been more than the surface drip system, because in the surface drip system, water moves more freely in the soil and most changes in the moisture front were made before redistribution. Considering the moisture redistribution is very important for the design of irrigation systems because it leads to better management of moisture distribution and prevention of deep losses.

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References

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Irrigation and Water Engineering
Volume 13, Issue 1 - Serial Number 49
October 2022
Pages 124-140

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