干旱区生态环境知识资源中心(Arid): Laboratory characterization of sandy soil water content during drying process using electrical resistivity/resistance method (ERM)

Arid

DOI	10.1007/s10064-020-01805-y
	Laboratory characterization of sandy soil water content during drying process using electrical resistivity/resistance method (ERM)
	An, Ni 1,2; Tang, Chao-Sheng 1; Cheng, Qing 1; Wang, De-Yin 1; Shi, Bin 1
通讯作者	Tang, Chao-Sheng
来源期刊	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
ISSN	1435-9529
EISSN	1435-9537
出版年	2020
卷号	79 期号:8 页码:4411-4427
英文摘要	Drought-induced evaporation can reduce soil water content and significantly alter soil hydro-mechanical behavior. Understanding the temporal and spatial distribution characteristics of soil water content during evaporation is of great significance for evaluating the encountered geotechnical and geo-environmental problems in arid or semi-arid regions. In this study, an electrical resistivity/resistance method (ERM) with a high spatial resolution of centimeter-level was developed for a small-scale laboratory test and applied to quantitatively characterize the evaporation-induced water content variations along a depth gradient. A total of 8 groups of initially saturated sandy soil columns (84 mm in diameter and 290 mm in height) were prepared, and eight pairs of mini electrodes (3.5 mm in diameter) were installed in each soil sample with a vertical distance of 30 mm. The soil columns were subjected to continuous drying. The changes in soil electrical resistance at different depths were monitored by the electrode couples. The gravimetric water contents at different depths were also measured at the end of drying. It is found that soil water content decreases exponentially with increasing electrical resistance. Based on the obtained data, a calibration relationship between soil gravimetric water content and corrected electrical resistance was well established with consideration of temperature effect. This relationship was validated successfully by the experimental results, indicating the feasibility of the developed ERM to characterize the soil water content dynamics during the drying process. Besides, the drying process with the movement of the evaporation front was discussed. The results of this study demonstrate the good performance of ERM in the estimation of temporal and spatial variations of soil water content and its potential application in arid or semi-arid regions with frequent droughts.
英文关键词	Soil water evaporation Soil water content Electrical resistivity resistance method (ERM) Evaporation front Temperature effect
类型	Article
语种	英语
国家	Peoples R China ; Wales
收录类别	SCI-E
WOS记录号	WOS:000531230300002
WOS关键词	BARE-SOIL ; DC RESISTIVITY ; CLAYEY SOIL ; TEMPERATURE-CHANGES ; EVAPORATIVE FLUXES ; SURFACE-RESISTANCE ; NUMERICAL-ANALYSIS ; SOLUTE TRANSPORT ; TOMOGRAPHY ERT ; CONDUCTIVITY
WOS类目	Engineering, Environmental ; Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; Geology
来源机构	南京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319076
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, 163 Xianlin Ave, Nanjing 210023, Peoples R China; 2.Cardiff Univ, Geoenvironm Res Ctr, Cardiff Sch Engn, Newport Rd, Cardiff CF24 3AA, Wales
推荐引用方式 GB/T 7714	An, Ni,Tang, Chao-Sheng,Cheng, Qing,et al. Laboratory characterization of sandy soil water content during drying process using electrical resistivity/resistance method (ERM)[J]. 南京大学,2020,79(8):4411-4427.
APA	An, Ni,Tang, Chao-Sheng,Cheng, Qing,Wang, De-Yin,&Shi, Bin.(2020).Laboratory characterization of sandy soil water content during drying process using electrical resistivity/resistance method (ERM).BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,79(8),4411-4427.
MLA	An, Ni,et al."Laboratory characterization of sandy soil water content during drying process using electrical resistivity/resistance method (ERM)".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 79.8(2020):4411-4427.