Experimental and Numerical Analysis of Drip Tape Layout for Irrigation of Sugarcane in Latosol

A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus- 3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L.

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Soil water movement under a drip irrigation double-point source

Water Science & Technology Water Supply ◽

10.2166/ws.2015.045 ◽

2015 ◽

Vol 15 (5) ◽

pp. 924-932

Author(s):

Lizhu Hou ◽

Jie Shang ◽

Jiangtao Liu ◽

Haiyuan Lu ◽

Zhiming Qi

Keyword(s):

Soil Moisture ◽

Point Source ◽

Soil Water ◽

Drip Irrigation ◽

Double Point ◽

Water Movement ◽

Time Domain Reflectometry ◽

Runoff Water ◽

Surface Drip Irrigation ◽

Soil Water Movement

Particularly in dry regions, the scarcity of high-quality fresh water has heightened the importance of urban runoff water re-use, leading as well to the improvement of water use efficiency through the surface drip irrigation method. Given the limited research on wetting front migration under a surface drip irrigation emitter, soil water movement under a double-point-source irrigation emitter was investigated. An experimental soil bin was designed and filled with silt loam soil, and time domain reflectometry and tensiometers were used to measure soil moisture contents and soil water potential, respectively. The results show that under the conditions of 6 hours of irrigation with two drippers each delivering 1.05 L hr−1 and spaced at 45 cm, the soil moisture content of the 0–30 cm layer increased rapidly and reached 0.29 cm3 cm−3, and was greater than that in the 30–60 cm layer as irrigation proceeded. After 6 hours the irrigation was stopped, such that in the redistribution phase, soil moisture of the top layer gradually decreased, while that of the sublayer gradually increased. The results indicate that 6 hours of irrigation under given emitter flow conditions produced adequate soil moisture down to 30 cm for most shallow-rooted crops.

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Using HYDRUS 2D/3D to Evaluate Soil Water Movement in Drip-irrigated Young Populus tomentosa Plantations on Sandy Loam Soil

10.5194/egusphere-egu2020-11286 ◽

2020 ◽

Author(s):

Doudou Li ◽

Benye Xi ◽

Liming Jia

Keyword(s):

Soil Water ◽

Drip Irrigation ◽

Water Movement ◽

Sandy Loam ◽

Vertical Movement ◽

Populus Tomentosa ◽

Sandy Loam Soil ◽

Wetting Front ◽

Loam Soil ◽

Soil Water Movement

&#160; &#160; &#160;Understanding the rules of soil water movement under drip irrigation can provide data support and theoretical basis for developing precise drip irrigation strategies. In this study, a two-years-old Populus tomentosa plantation under surface drip irrigation on sandy loam soil was selected to measure the dynamics of soil water potential (&#968;s), wetting front and soil water content (&#952;) during irrigation and water redistribution periods were investigated in field experiments. Then, the observed data in the field were used to evaluate the accuracy and feasibility of the HYDRUS-2D/3D model for simulating the short-term soil water movement. Besides, the validated model was used to simulate the dynamics of wetting front under different initial soil water content (&#952;i). During irrigation, the variation of &#968;s, horizontal and vertical movement distances of the wetting front, and &#952; within the wetting volume with irrigation duration could be described by the logistic function (R2 = 0.99), the logarithm function (R2 = 0.99), the power function (R2 = 0.82), and the polynomial function (R2 = 0.99), respectively. At the end of irrigation, the horizontal and vertical movement distances of the wetting front reached 22.9 cm and 37.3 cm, respectively. The &#968;s and &#952; within the soil wetting volume were 61.6% and 30.9% higher than those at the start of the irrigation, respectively, but the &#968;s decreased to its initial level about 120 hours later after the stop of irrigation. The average deviations of the horizontal and vertical wetting radius between the simulated and measured values were 1.3 and 4.5 cm, respectively. The mean RMSE and RMAE of HYDRUS-2D/3D for simulating &#952; at the end of irrigation and during water redistribution were 0.021 cm3&#8729;cm-3 and 9.7%, respectively. The movement distances of wetting front in the experimental plantation under various soil drought degrees (soil water availabilities were 40%, 60%, 73% and 80%) were obtained through scenarios simulations using HYDRUS-2D/3D. And it was found that the wetting front could move further under higher &#952;i, and the movement distance of the wetting front was always smaller in the horizontal direction than in the vertical direction under different &#952;i conditions. Consequently, HYDRUS-2D/3D can be used to well simulate the short-term soil water movement in drip-irrigated young P. tomentosa plantations on sandy loam soil. In addition, the constructed figure (describes the variations of the horizontal and vertical soil wetting distances with the irrigation duration) can be used to determine the reasonable irrigation duration for the plantations of P. tomentosa and other tree species on sandy loam soil.

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Ridge Basis Functions Collocation Method for Soil Water Movement Equations Under Infiltration with Two Point-source Emitters

DEStech Transactions on Computer Science and Engineering ◽

10.12783/dtcse/mso2018/20478 ◽

2018 ◽

Author(s):

Xing WANG ◽

Xin YANG

Keyword(s):

Point Source ◽

Soil Water ◽

Collocation Method ◽

Water Movement ◽

Basis Functions ◽

Soil Water Movement

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Soil water movement in the unsaturated zone of an inland arid region: Mulched drip irrigation experiment

Journal of Hydrology ◽

10.1016/j.jhydrol.2018.02.012 ◽

2018 ◽

Vol 559 ◽

pp. 13-29 ◽

Cited By ~ 8

Author(s):

Dongmei Han ◽

Tiantian Zhou

Keyword(s):

Soil Water ◽

Drip Irrigation ◽

Unsaturated Zone ◽

Arid Region ◽

Water Movement ◽

Soil Water Movement ◽

Mulched Drip Irrigation

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Identification and Optimization of Soil Water Movement Model Based on GA under Drip-Irrigation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.571-572.148 ◽

2014 ◽

Vol 571-572 ◽

pp. 148-151

Author(s):

Yuan Yuan Liu ◽

Hai Yan Sun ◽

Zhi Guo Zhang

Keyword(s):

Soil Water ◽

Drip Irrigation ◽

Water Movement ◽

Dynamic Change ◽

Great Influence ◽

Movement Model ◽

Movement Distance ◽

Function Models ◽

Movement Rules ◽

Soil Water Movement

Under drip irrigation, the drip discharge has a great influence on soil water movement and crop growth. Studying the soil water movement rules makes great realistic significance to the precise management. Based on soil dynamics theory, we measured the water movement distance of saline soil in Changji Xinjiang through outdoor tests. Then, we built transfer function models between drip discharge and water movement distance under drip irrigation and applied the genetic algorithm to identifying and optimizing model’s parameters. Comparing the soil water movement model’s dynamic change at the same drip discharge, the model’s validity is validated. It can solve the feedback adjusting according to crop root, and the waste of water resource is reduced.

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Modeling Soil Water Movement in Pedostructure

10.13031/2013.20766 ◽

2006 ◽

Author(s):

Rabi H. Mohtar ◽

Erik Braudeau

Keyword(s):

Soil Water ◽

Water Movement ◽

Soil Water Movement

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Simulating soil-water movement under a hedgerow surrounding a bottomland reveals the importance of transpiration in water balance

Hydrological Processes ◽

10.1002/hyp.6619 ◽

2008 ◽

Vol 22 (5) ◽

pp. 577-585 ◽

Cited By ~ 14

Author(s):

Z. Thomas ◽

J. Molénat ◽

V. Caubel ◽

C. Grimaldi ◽

P. Mérot

Keyword(s):

Water Balance ◽

Soil Water ◽

Water Movement ◽

Soil Water Movement

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Discontinuous finite volume element method of two-dimensional unsaturated soil water movement problem

Advances in Difference Equations ◽

10.1186/s13662-019-2395-7 ◽

2019 ◽

Vol 2019 (1) ◽

Author(s):

Fan Chen ◽

Zhixiao Xu

Keyword(s):

Soil Water ◽

Finite Volume ◽

Unsaturated Soil ◽

Water Movement ◽

Optimal Error Estimate ◽

Two Dimensional ◽

Fully Discrete ◽

Volume Method ◽

Movement Problem ◽

Soil Water Movement

AbstractIn this paper, a numerical approximation method for the two-dimensional unsaturated soil water movement problem is established by using the discontinuous finite volume method. We prove the optimal error estimate for the fully discrete format. Finally, the reliability of the method is verified by numerical experiments. This method is not only simple to calculate, but also stable and reliable.

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