Simulation of soil water movement under subsurface irrigation with porous ceramic emitter

Cai, Yaohui; Wu, Pute; Zhang, Lin; Zhu, Delan; Chen, Junying; Wu, Shoujun; Zhao, Xiao Dong

doi:10.1016/j.agwat.2017.07.004

Cited by 41 publications

(21 citation statements)

References 29 publications

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“…As the distance from the porous tube increased, the upward water contents decreased due to slow upward infiltration. The results revealed that after the 40th day, the wetting patterns at 30, 40 and 50 cm depths were relatively stable, as the soil was saturated [24].…”

Section: ) Laboratory Tests Measurement Resultsmentioning

confidence: 95%

“…Two systematic openings were made on two side walls of the box. The porous tube installed at 50 cm depth was connected with a water reservoir (Markov bottle with 5 mm wall thickness) through a PVC pipe of 160cm length [24]. The wetting patterns could easily be monitored from the glass walls.…”

Section: A Time Division Multiplexing Based Circuit Laboratory Testsmentioning

confidence: 99%

“…Since one porous tube was used in the experiment, the water movement and its infiltration processes could be taken as symmetrical, assuming that the soil was uniform, and neglecting the evaporation, as the soil box was covered with a plastic sheet. The following Richards equation 2was used [23], [24].…”

Section: ) Hydrus Simulationmentioning

confidence: 99%

“…The installation depth drives the moisture distribution. In recent studies, sensor measured SM contents in the soil box have been compared with the HYDRUS-2D simulated wetting patterns [23], [24]. HYDRUS-2D is Windows-based computer software used for numerical simulation of the moisture, heat, or solute distribution around the variably-saturated porous tubes installed at different soil depths.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Low-Cost Multi-Depth Real-Time Soil Moisture Sensor Using Time Division Multiplexing Approach

et al. 2019

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Soil moisture (SM) is an integral parameter for scheduling irrigation. The precise and real-time measurement of SM is difficult due to its complex nature. The purpose of this paper was to determine whether the time division multiplexing (TDM) approach would effectively estimate SM content. We developed a sensor to detect SM from four soil depths (10, 20, 40, and 60 cm) simultaneously by using the TDM technique. This is a type of EM sensor that indirectly estimates the SM on the basis of the dielectric properties of soil. Three types of soil samples were used to calibrate the sensor. The calibration models were established using polynomial (3rd order) fitting equations. The performance of the sensor was evaluated both in the laboratory and in situ conditions. The sensitivity of the sensor was examined in a micro-control irrigation system. The sensor measured SM contents in a soil box were compared with HYDRUS-2D simulated wetting patterns. The results were in the optimal range, and the coefficient of determination (R 2) ranged from 0.97 to 0.99 and root means square error (RMSE) from 0.72 to 2.01. The TDM detection circuit-based sensor R 2 value was 0.97, and its RMSE was 2.78. Whereas the independent detection circuit R 2 values ranged from 0.93 to 0.96 and RMSE from 4.09 to 5.07. The results determined that the sensor could be used for continuous SM measurements, which would be advantageous for planning the irrigation practices in arid and irrigated regions. INDEX TERMS Dielectric sensor, multi-depth, micro-control irrigation, soil moisture, time division multiplexing.

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Section: ) Laboratory Tests Measurement Resultsmentioning

confidence: 95%

Section: A Time Division Multiplexing Based Circuit Laboratory Testsmentioning

confidence: 99%

Section: ) Hydrus Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a Low-Cost Multi-Depth Real-Time Soil Moisture Sensor Using Time Division Multiplexing Approach

et al. 2019

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“…For example, due to no visuals, the SDI can be hard to manage since the problems occur underground. Previously subsurface irrigation was achieved using buried ceramic clay pots ( Cai et al., 2017 ). The technique allowed water to migrate through the micropores in the direction of suction.…”

Section: Introductionmentioning

confidence: 99%

Moistube irrigation technology development, adoption and future prospects: A systematic scoping review

Dirwai

Mabhaudhi

Kanda

et al. 2021

Heliyon

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Agriculture is the biggest consumer of fresh water in the world accounting for almost 70% of the water use. The burgeoning world population and increased demands to feed the world requires novel technologies that reconcile water consumption and food security. Moistube is a polymeric semi-permeable membrane irrigation technology that is known to improve water use efficiency and boost yields. The technology is relatively new, hence a lack of comprehensive literature regarding Moistube irrigation (MTI) technology warrants empirical investigation of the existing literature. The study performed a systematic review guided by the Preferred reporting items for systematic review and meta-analysis protocols (PRISMA-P) and the scoping studies methodological framework to compile an evidence-based literature review on Moistube irrigation. The study performed search queries in the following over-arching and comprehensive databases for grey literature: Google Scholar, Science Direct, Research Gate, CAB direct, All Journals, CNKI, FAO, SCOPUS, Web of Science, and UKZN-EFWE. DistillerSR software was used for screening, data extraction and data charting. Article screening retained one hundred and 55 (n = 155) articles. Forty-nine articles (n = 49) and information sources were found to be related directly and indirectly to Moistube. Moistube articles (n = 29, 59%) were from China were the technology originated. A bulk of literature reported Moistube irrigation use in the arid regions of China. The review revealed areas for research enquiry into the subject matter. Future research areas were fertigation performance under MTI, effects of waste-water on MTI nanopore plugging, yield response of industrial crops of economic importance under MTI and soil wetting geometries under MTI. This signified the need to perform further research enquiries into the subject matter to improve literature availability. Moistube irrigation technology has a low adoption rate in Africa with reported use in South Africa and Morocco. The technology has massive adoption potential in arid and semi-arid regions of sub-Sahara Africa.

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Empirical models for calculating soil wetting patterns under surface drip irrigation systems: A comprehensive analysis

Li,

Nie,

2024

Irrigation and Drainage

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Accurate estimation of the surface wetted radius (R) and vertical wetted depth (Z) of wetting patterns in drip irrigation systems is crucial for ensuring that the designs of such systems are effective. This study compared 14 empirical models for estimating drip irrigation wetting patterns by assessing their accuracy using published measurement data and HYDRUS‐2D/3D simulations. The technique for order of preference by similarity to the ideal solution (TOPSIS) was employed to comprehensively rank the models. The results indicate that the empirical model proposed by Fan et al. (2023) (FY) exhibited the highest accuracy when the estimations of R and measured and simulated values were compared, with mean absolute error (MAE), root mean square error (RMSE), Nash–Sutcliffe modelling efficiency (NSE), and percent bias (PB) values of 2.2 cm, 3.4 cm, 0.79, and −7.1% and 5.2 cm, 7.0 cm, 0.50, and −14.1%, respectively. The empirical model proposed by Amin and Ekhmaj (2006) (AE) demonstrated the highest accuracy when the estimations of Z were compared with measured and simulated values, with MAE, RMSE, NSE and PB values of 1.7 cm, 2.0 cm, 0.95 and 4.15% and 4.4 cm, 5.9 cm, 0.82 and 4.7%, respectively. The comprehensive rankings of available models in the present study indicate that the FY model is the most universally applicable, followed by the Li et al. (2022) (LY) model, with comprehensive indices of 0.960 and 0.936, respectively. This research can aid in the selection of universally applicable, reliable and straightforward empirical models for estimating wetting patterns in drip irrigation systems.

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Simulation of soil water movement under subsurface irrigation with porous ceramic emitter

Cited by 41 publications

References 29 publications

Development of a Low-Cost Multi-Depth Real-Time Soil Moisture Sensor Using Time Division Multiplexing Approach

Development of a Low-Cost Multi-Depth Real-Time Soil Moisture Sensor Using Time Division Multiplexing Approach

Moistube irrigation technology development, adoption and future prospects: A systematic scoping review

Empirical models for calculating soil wetting patterns under surface drip irrigation systems: A comprehensive analysis

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