A simple method for estimating water diffusivity of unsaturated soils

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	A simple method for estimating water diffusivity of unsaturated soils
	Wang, QJ ; Shao, M(邵明安) ; Horton, R
刊名	SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
	2004
卷号	68 期号:3 页码:713-718
ISSN号	0361-5995
通讯作者	Horton R
学科主题	Soil Science
收录类别	SCI
语种	英语
公开日期	2011-06-10
附注	Numerical models have been extensively used for predicting water and solute transport in saturated and unsaturated soils. Soil hydraulic properties are required for quantitatively describing water and chemical transport processes in soils by the numerical models. Soil water diffusivity is one of the important hydraulic properties. Several approaches have been developed to estimate the soil water diffusivity, however the intensive calculations and time-consuming measurements required by the methods for determining soil water diffusivity limit the application of the methods. It is necessary to develop a method with easily performed experiments for determining soil water diffusivity. In this paper, the problem of water absorption into a horizontal soil column is solved, and the relationship between cumulative infiltration and infiltration rate with the distance of the wetting front are obtained. Based on the relationships, a new and relatively simple method for estimating soil water diffusivity is presented in this paper. Experiments of water absorption into 60-cm long and 25-cm long horizontal soil columns were conducted to evaluate the method. Estimates of soil water diffusivity by the new method were in good agreement with estimates by the Bruce and Klute method. With the new method short (approximately 8 cm) soil columns can be used, and it is possible to use the new method to estimate soil water diffusivity of undisturbed soils. Therefore, the present method provides simplicity for determining soil water diffusivity.
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/3759]
专题	地理科学与资源研究所_专家文献库
推荐引用方式 GB/T 7714	Wang, QJ,Shao, M,Horton, R. A simple method for estimating water diffusivity of unsaturated soils[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2004,68(3):713-718.
APA	Wang, QJ,Shao, M,&Horton, R.(2004).A simple method for estimating water diffusivity of unsaturated soils.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,68(3),713-718.
MLA	Wang, QJ,et al."A simple method for estimating water diffusivity of unsaturated soils".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 68.3(2004):713-718.