干旱区生态环境知识资源中心(Arid): Field and numerical experiments of subsurface drainage systems in saline and low-permeability interlayered fields in arid regions

Arid

DOI	10.1016/j.agwat.2024.108898
	Field and numerical experiments of subsurface drainage systems in saline and low-permeability interlayered fields in arid regions
	Guo, Chenyao; Yao, Chenzhi; Wu, Jingwei; Qin, Shuai; Yang, Haoyu; Li, Hang; Mao, Jun
通讯作者	Wu, JW
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2024
卷号	300
英文摘要	A reasonable layout of subsurface drainage systems is considered essential for maximizing its drainage and salt control effectiveness. In the saline-alkali farmland of arid regions in Northwest China, low-permeability interlayers (clay, clay-loam or silty-loam) within the soils are common. However, the influence of the lowpermeability interlayers on the layout of the subsurface drainage has not been extensively considered in the literature. This study investigated the process of subsurface drainage and salt discharge in salt-affected fields with silty-loam interlayers using field experiments and numerical simulations. Four field experiments were conducted, considering three different relative positions between the drainage pipes and silty-loam interlayers. The results showed that the silty-loam interlayers hindered water infiltration, and the distribution of soil salinity in the soil profile varied with the buried depth of drainage pipes at different positions relative to the silty-loam interlayer. When the buried depth of drainage pipes increased, the amount of water and salt discharged from drainage pipes increased, and the increase rate in salt discharge was greater than water drainage. A numerical model was calibrated and validated using the field experiment data, and 25 orthogonal numerical experiments were conducted to investigate the soil desalination effects of buried depth of drainage pipes, spacing between the pipes, saturated hydraulic conductivity of the interlayer, and position of the low-permeability interlayer. The results showed that the drainage pipe buried depth, spacing, and saturated hydraulic conductivity of the lowpermeability interlayer had significant effects on the desalination rate (P < 0.01), while the position of the low-permeability interlayer had no significant effect (P > 0.05). Subsurface drainage pipes should be placed below the low-permeability interlayer. The desalination rate linearly increased with the buried depth of drainage pipe and saturated hydraulic conductivity of the interlayer, and it increased exponentially with decreased spacing. An empirical formula for soil desalination rate considering interlayer and subsurface drainage pipe layout parameters was fabricated and used to determine the appropriate layout parameters.
英文关键词	Subsurface drainage Low-permeability interlayer Drainage system layout Soil desalination
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001258019600001
WOS关键词	HYDRAULIC CONDUCTIVITY ; SOIL ; MODELS ; WATER ; FLOW ; DEGRADATION ; TRANSPORT
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402678
推荐引用方式 GB/T 7714	Guo, Chenyao,Yao, Chenzhi,Wu, Jingwei,et al. Field and numerical experiments of subsurface drainage systems in saline and low-permeability interlayered fields in arid regions[J],2024,300.
APA	Guo, Chenyao.,Yao, Chenzhi.,Wu, Jingwei.,Qin, Shuai.,Yang, Haoyu.,...&Mao, Jun.(2024).Field and numerical experiments of subsurface drainage systems in saline and low-permeability interlayered fields in arid regions.AGRICULTURAL WATER MANAGEMENT,300.
MLA	Guo, Chenyao,et al."Field and numerical experiments of subsurface drainage systems in saline and low-permeability interlayered fields in arid regions".AGRICULTURAL WATER MANAGEMENT 300(2024).