Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors

Vertical line source irrigation (VLSI) is an underground irrigation method suitable for deep-rooted plants. Understanding the characteristics of the soil wetting body of the VLSI was the key to designing this irrigation system. On the basis of experimental verification of the reliability of the HYDR...

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Autores principales:	Yanwei Fan, Liangjun Ma, Hujun Wei, Pengcheng Zhu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	hydrus-2d numerical simulation soil water distribution vertical line source irrigation wetting front migration Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/db8d3be61c504a95acf89494fca9ac4e
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spelling	oai:doaj.org-article:db8d3be61c504a95acf89494fca9ac4e2021-11-06T07:18:49ZNumerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors1606-97491607-079810.2166/ws.2021.054https://doaj.org/article/db8d3be61c504a95acf89494fca9ac4e2021-08-01T00:00:00Zhttp://ws.iwaponline.com/content/21/5/2233https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Vertical line source irrigation (VLSI) is an underground irrigation method suitable for deep-rooted plants. Understanding the characteristics of the soil wetting body of the VLSI was the key to designing this irrigation system. On the basis of experimental verification of the reliability of the HYDRUS simulation results of VLSI under the conditions of soil texture (ST), initial water content (θi), line source buried depth (B), line source diameter (D) and line source length (L), numerical studies of the migration law of the wetting front of VLSI and the distribution characteristics of soil moisture were performed. The wetting front migration (WFM) was mainly influenced by ST, θi, D and L (P < 0.05), while B had little effect on WFM (P > 0.05). The shape of the soil wetting body changed little under different influencing factors. The water content contour was approximately ‘ellipsoidal’ around the line source. The soil moisture near the line source was close to the saturated moisture content. The moisture content around the line source gradually decreased outward, and the contour lines gradually became dense. According to the simulation results, a prediction model of multiple factors influencing the migration process of the VLSI wetting front was established. The predicted value was in good agreement with the measured value. The results of this research could provide a theoretical basis for further optimizing the combination of VLSI and irrigation elements. HIGHLIGHTS Based on HYDRUS-2D, a multi-factor prediction model was established for the wet front migration process in vertical source irrigation.; The validity of the model was verified by experimental data, and the prediction effect was good.; Numerical studies of the migration law of the wetting front of the vertical line source irrigation and the distribution characteristics of soil moisture were performed.; The wetting front migration was mainly influenced by soil texture, initial water content, line source diameter and line source length (P < 0.05), while line source buried depth had little effect on it (P > 0.05).; The shapes of the contours of soil moisture content were slightly different, and were all approximate 'ellipsoids' with the axis of the line source.;Yanwei FanLiangjun MaHujun WeiPengcheng ZhuIWA Publishingarticlehydrus-2dnumerical simulationsoil water distributionvertical line source irrigationwetting front migrationWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 5, Pp 2233-2248 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrus-2d numerical simulation soil water distribution vertical line source irrigation wetting front migration Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	hydrus-2d numerical simulation soil water distribution vertical line source irrigation wetting front migration Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Yanwei Fan Liangjun Ma Hujun Wei Pengcheng Zhu Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
description	Vertical line source irrigation (VLSI) is an underground irrigation method suitable for deep-rooted plants. Understanding the characteristics of the soil wetting body of the VLSI was the key to designing this irrigation system. On the basis of experimental verification of the reliability of the HYDRUS simulation results of VLSI under the conditions of soil texture (ST), initial water content (θi), line source buried depth (B), line source diameter (D) and line source length (L), numerical studies of the migration law of the wetting front of VLSI and the distribution characteristics of soil moisture were performed. The wetting front migration (WFM) was mainly influenced by ST, θi, D and L (P < 0.05), while B had little effect on WFM (P > 0.05). The shape of the soil wetting body changed little under different influencing factors. The water content contour was approximately ‘ellipsoidal’ around the line source. The soil moisture near the line source was close to the saturated moisture content. The moisture content around the line source gradually decreased outward, and the contour lines gradually became dense. According to the simulation results, a prediction model of multiple factors influencing the migration process of the VLSI wetting front was established. The predicted value was in good agreement with the measured value. The results of this research could provide a theoretical basis for further optimizing the combination of VLSI and irrigation elements. HIGHLIGHTS Based on HYDRUS-2D, a multi-factor prediction model was established for the wet front migration process in vertical source irrigation.; The validity of the model was verified by experimental data, and the prediction effect was good.; Numerical studies of the migration law of the wetting front of the vertical line source irrigation and the distribution characteristics of soil moisture were performed.; The wetting front migration was mainly influenced by soil texture, initial water content, line source diameter and line source length (P < 0.05), while line source buried depth had little effect on it (P > 0.05).; The shapes of the contours of soil moisture content were slightly different, and were all approximate 'ellipsoids' with the axis of the line source.;
format	article
author	Yanwei Fan Liangjun Ma Hujun Wei Pengcheng Zhu
author_facet	Yanwei Fan Liangjun Ma Hujun Wei Pengcheng Zhu
author_sort	Yanwei Fan
title	Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
title_short	Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
title_full	Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
title_fullStr	Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
title_full_unstemmed	Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
title_sort	numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/db8d3be61c504a95acf89494fca9ac4e
work_keys_str_mv	AT yanweifan numericalinvestigationofwettingfrontmigrationandsoilwaterdistributionunderverticallinesourceirrigationwithdifferentinfluencingfactors AT liangjunma numericalinvestigationofwettingfrontmigrationandsoilwaterdistributionunderverticallinesourceirrigationwithdifferentinfluencingfactors AT hujunwei numericalinvestigationofwettingfrontmigrationandsoilwaterdistributionunderverticallinesourceirrigationwithdifferentinfluencingfactors AT pengchengzhu numericalinvestigationofwettingfrontmigrationandsoilwaterdistributionunderverticallinesourceirrigationwithdifferentinfluencingfactors
_version_	1718443824854859776

Numerical investigation of wetting front migration and soil water distribution under vertical line source irrigation with different influencing factors

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