Evaluation of the Soil Moisture Profile in Subsurface Drip Irrigation Using HYDRUS-2D model

Khalili, Mozdeh; Akbari, Mehdi; Hezarjaribi, Abotaleb; Zakerinia, Mehdi; Abbasi, Fariborz; Koulaian, Ali

Evaluation of the Soil Moisture Profile in Subsurface Drip Irrigation Using HYDRUS-2D model

Document Type : Original Article

Authors

¹ Graduated MS of Irrigation and Drainage Engineering, Agricultural Sciences and Natural Resources University of Gorgan., Gorgan., Iran

² Assistant Professor, Agriculture Engineering Research Institute., Karaj., Iran

³ Associate of Department of Water Engineering, Agricultural Sciences and Natural Resources University of Gorgan., Gorgan., Iran

⁴ Assistant Professor of Department of Water Engineering, Agricultural Sciences and Natural Resources University of Gorgan., Gorgan., Iran

⁵ Associate, Agriculture Engineering Research Institute., Karaj., Iran

⁶ Graduated MS of Irrigation and Drainage Engineering, Agricultural Sciences and Natural Resources University of Sari., Sari., Iran

Abstract

Because of decreasing the value and availability of water resources, we have to use water resources in a best way. The new irrigation systems like subsurface drip irrigation can improve irrigation efficiency and water use efficiency. To properly manage SDI systems, the precise distribution of water around the emitter must be known. Several models have been developed to simulate soil moisture pattern and wetting front by using soil hydraulic parameters, the emitter’s discharge and the volume of discharged water. In this paper, HYDRUS-2D model was used so simulation results were compared with two sets of experiments involving SDI with emitters installed at two different depth (40 &50 cm) while the emitters space was 75 cm with 3.5 l/h emitter discharge. The RMSE at different locations around emitter varied between 0.014 and 0.033 for volumetric water content in 40 cm installation depth and 0.009 and 0.025 for 50 cm installation depth. The continuous horizontal wetting profile was achieved so the space of emitter was suitable. With due attention to our results, 75 cm distance between emitters and 50 cm installation depth with 3.5 l/hr emitter discharge is proposed to be applied in loamy soil.

Keywords

References

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