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Water 2018, 10(1), 89; https://doi.org/10.3390/w10010089

A Simplified Infiltration Model for Predicting Cumulative Infiltration during Vertical Line Source Irrigation

1
Key Laboratory of Mechanics on Disaster and Environment in Western China, the Ministry of Education of China, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730050, China
2
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730000, China
3
State Key Laboratory of Simulation and Regulation of Water Cycles in River Basins, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
*
Author to whom correspondence should be addressed.
Received: 24 November 2017 / Revised: 22 December 2017 / Accepted: 16 January 2018 / Published: 20 January 2018
(This article belongs to the Special Issue Water and Solute Transport in Vadose Zone)
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Abstract

Vertical line source irrigation is a water-saving irrigation method for enhancing direct water and nutrient delivery to the root zone, reducing soil evaporation and improving water and nutrient use efficiency. To identify its influencing factors, we performed computer simulations using the HYDRUS-2D software. The results indicate that for a given soil, the line source seepage area, but not the initial soil water content and buried depth, has a significant effect on the cumulative infiltration. We thus proposed a simplified method, taking into account the seepage area for predicting the cumulative infiltration based on the Philip model. Finally, we evaluated the accuracy of the simplified method using experimental data and found the cumulative infiltrations predicted by the simplified method were in very good agreement with the observed values, showing a low mean average error of 0.028–0.480 L, a root mean square error of 0.043–0.908 L, a percentage bias of 0.321–0.900 and a large Nash-Sutcliffe coefficient close to 1.0 (NSE ≥ 0.995). The results indicate that this simplified infiltration model, for which the only emitter parameter required is the seepage area, could provide a valuable and practical tool for irrigation design. View Full-Text
Keywords: vertical line source irrigation; cumulative infiltration; simplified infiltration model; HYDRUS-2D vertical line source irrigation; cumulative infiltration; simplified infiltration model; HYDRUS-2D
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fan, Y.; Huang, N.; Gong, J.; Shao, X.; Zhang, J.; Zhao, T. A Simplified Infiltration Model for Predicting Cumulative Infiltration during Vertical Line Source Irrigation. Water 2018, 10, 89.

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