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题名: Determination of the saturated film conductivity to improve the EMFX model in describing the soil hydraulic properties over the entire moisture range
作者: Wang, YQ; Ma, JZ; Guan, HD; Zhu, GF
收录类别: SCIE
出版日期: 2017-06
刊名: JOURNAL OF HYDROLOGY
卷号: 549, 页码:38-49
出版者: ELSEVIER
出版地: AMSTERDAM
英文摘要: Difficulty in measuring hydraulic conductivity, particularly under dry conditions, calls for methods of predicting the conductivity from easily obtained soil properties. As a complement to the recently published EMFX model, a method based on two specific suction conditions is proposed to estimate saturated film conductivity from the soil water retention curve. This method reduces one fitting parameter in the previous EMFX model, making it possible to predict the hydraulic conductivity from the soil water retention curve over the complete moisture range. Model performance is evaluated with published data of soils in a broad texture range from sand to clay. The testing results indicate that 1) the modified EMFX model (namely the EMFX-K model), incorporating both capillary and adsorption forces, provides good agreement with the conductivity data over the entire moisture range; 2) a value of 0.5 for the tortuosity factor in the EMFX-K model as that in the Mualem's model gives comparable estimation of the relative conductivity associated with the capillary force; and 3) a value of 1.0 x 10(-20) J for the Hamaker constant, rather than the commonly used value of 6.0 x 10(-20) J, appears to be more appropriate to represent solely the effect of the van der Waals forces and to predict the film conductivity. In comparison with the commonly used van Genuchten-Mualem model, the EMFX-K model significantly improves the prediction of hydraulic conductivity under dry conditions. The sensitivity analysis result suggests that the uncertainty in the film thickness estimation is important in explaining the model underestimation of hydraulic conductivity for the soils with fine texture, in addition to the uncertainties from the measurements and the model structure. High quality data that cover the complete moisture range for a variety of soil textures are required to further test the method. (C) 2017 Elsevier B.V. All rights reserved.
关键词: The EMFX model ; Hydraulic conductivity ; Soil water retention curve ; Film flow ; Unsaturated porous media
作者部门: [Wang, Yunquan] China Univ Geosci, Sch Environm Studies, Lumo Rd 388, Wuhan 430074, Peoples R China ; [Ma, Jinzhu ; Zhu, Gaofeng] Lanzhou Univ, Minist Educ, Key Lab Western Chinas Environm Syst, 222 South Tianshui Rd, Lanzhou 730000, Peoples R China ; [Guan, Huade] Flinders Univ South Australia, Sch Environm, Adelaide, SA, Australia ; [Guan, Huade] Flinders Univ South Australia, Natl Ctr Groundwater Res & Training, Adelaide, SA, Australia
通讯作者: Wang, YQ (reprint author), China Univ Geosci, Sch Environm Studies, Lumo Rd 388, Wuhan 430074, Peoples R China.
学科分类: Engineering; Geology; Water Resources
文章类型: Article
所属项目编号: National Science Foundation of China [41601030, U1403282] ; Fundamental Research Funds for Central Universities, China University of Geosciences (Wuhan) [G1323521674]
所属项目名称: 国家自然科学基金项目
项目资助者: NSFC
语种: 英语
DOI: 10.1016/j.jhydrol.2017.03.063
ISSN号: 0022-1694
WOS记录号: WOS:000403855500004
IR记录号: WOS:000403855500004
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/189879
Appears in Collections:资源环境学院_期刊论文

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作者单位: 12ENVIROM

Recommended Citation:
Wang, YQ,Ma, JZ,Guan, HD,et al. Determination of the saturated film conductivity to improve the EMFX model in describing the soil hydraulic properties over the entire moisture range[J]. JOURNAL OF HYDROLOGY,2017,549:38-49.
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