Simulation of the Advance Velocity of the Moisture Front in Pulse Drip Irrigation Systems Using Nonlinear Regression Model

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KARIMI B.; KARIMI N.

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Paper Information

Journal: Iranian Journal of Irrigation and Drainage Year:2020 | Volume:13 | Issue:5 Page(s): 1374-1387

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Title

Simulation of the Advance Velocity of the Moisture Front in Pulse Drip Irrigation Systems Using Nonlinear Regression Model

Author(s)

KARIMI B. | KARIMI N. | Issue Writer Certificate

Keywords

Irrigation managementQ2

Nonlinear regressionQ1

Subsurface drip irrigationQ1

Moisture bulbQ2

Abstract

Estimating the advance velocity of the moisture front is one of the important parameters in designing and managing of the drip irrigation system. In this study, experiments were carried out in a transparent plexyglass tank (3*1*0. 5 m) using three different soil textures (fine, heavy and medium). The drippers were installed at 3 different soil depths (surface, 15cm and 30cm). The emitter discharge was considered 2. 4, 4 and 6 lit/hr. Also, these experiments were carried out for two continuous and pulse irrigation systems. In pulse irrigation, the pulse cycles were considered 30-30, 20-40 and 40-20 min. In this research, using Nonlinear regression model, empirical models were developed to predict the advance velocity of the moisture front in different directions. The input parameters of suggested model include emitter discharge, saturated hydraulic conductivity, application time, soil bulk density, emitter installation depth, initial soil moisture content, the ratio of irrigation time to complete period of each cycle and the proportions of sand, silt and clay in the soil. The results of comparison between measured and simulated values of advance velocity indicated that these models have acceptable precision and accuracy in estimating the advance velocity of the wetting front in different directions. The values of the mean absolute error (MAE) and the root mean square error (RMSE) varied between 0. 031-0. 108 and 0. 067-0. 275 cm/min, respectively.

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APA: Copy

KARIMI, B., & KARIMI, N.. (2020). Simulation of the Advance Velocity of the Moisture Front in Pulse Drip Irrigation Systems Using Nonlinear Regression Model. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 13(5 ), 1374-1387. SID. https://sid.ir/paper/131474/en

Vancouver: Copy

KARIMI B., KARIMI N.. Simulation of the Advance Velocity of the Moisture Front in Pulse Drip Irrigation Systems Using Nonlinear Regression Model. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2020;13(5 ):1374-1387. Available from: https://sid.ir/paper/131474/en

IEEE: Copy

B. KARIMI, and N. KARIMI, “Simulation of the Advance Velocity of the Moisture Front in Pulse Drip Irrigation Systems Using Nonlinear Regression Model,” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 13, no. 5 , pp. 1374–1387, 2020, [Online]. Available: https://sid.ir/paper/131474/en

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