气候变化领域集成服务门户(CCPortal): A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant

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DOI	10.5194/hess-24-5903-2020
	A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant
	Wu M.; Wu J.; Wu J.; Hu B.X.
发表日期	2020
ISSN	1027-5606
起始页码	5903
结束页码	5917
卷号	24 期号:12
英文摘要	Representative elementary volume (REV) is essential for measuring and quantifying the effective parameters of a complex heterogeneous medium. To overcome the limitations of the existing REV estimation criteria, a new REV estimation criterion (i) based on dimensionless range and gradient calculation is proposed in this study to estimate the REV of a translucent material based on light transmission techniques. Three sandbox experiments are performed to estimate REVs of porosity, density, tortuosity, and perchloroethylene (PCE) plume using multiple REV estimation criteria. In comparison with i, previous REV estimation criteria based on the coefficient of variation (CVi ), the entropy dimension (DIi) and the relative gradient error (gi ) are tested in REV quantification of translucent silica and the inner PCE plume to achieve their corresponding effects. Results suggest that the new criterion (i) can effectively identify the REV in the materials, whereas the coefficient of variation and entropy dimension (F = -2:01 × 10-12 C 1 p2p×1:50e - .REV-4:35/2 2•1:502 ) are not effective. The relative gradient error can make the REV plateau obvious, while random fluctuations make the REV plateau difficult to identify accurately. Therefore, the new criterion is appropriate for REV estimation of the translucent materials and inner contaminant. Models are built based on a Gaussian equation to simulate the distribution of REVs for media properties, whose frequency of REV is dense in the middle and sparse on both sides. REV estimation of the PCE plume indicates that a high level of porosity leads to a large value of mean and standard deviation for REVs of PCE saturation (So) and PCE water interfacial area (AOW). Fitted equations are derived from distribution of REVs for the PCE plume related to dm (distances from mass center to considered point) and dI (distances from injection position to considered point). Moreover, relationships between REVs of the PCE plume and So are fitted using regression analysis. Results suggest a decreasing trend appears for So-REV when So increases, while AOW-REV increases with increasing So. © 2020 Author(s).
语种	英语
scopus关键词	Light transmission; Porosity; Porous materials; Silica; Coefficient of variation; Effective parameters; Gradient calculations; Heterogeneous medium; Mean and standard deviations; Representative elementary volume; Translucent materials; Transmission techniques; Entropy; error analysis; estimation method; heterogeneity; parameterization; porosity; porous medium; regression analysis; silica; tetrachloroethylene
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159233
作者单位	Wu, M., Institute of Groundwater and Earth Sciences, Jinan University, Guangzhou, 510632, China, Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Wu, J., Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Wu, J., Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Hu, B.X., Institute of Groundwater and Earth Sciences, Jinan University, Guangzhou, 510632, China
推荐引用方式 GB/T 7714	Wu M.,Wu J.,Wu J.,et al. A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant[J],2020,24(12).
APA	Wu M.,Wu J.,Wu J.,&Hu B.X..(2020).A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant.Hydrology and Earth System Sciences,24(12).
MLA	Wu M.,et al."A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant".Hydrology and Earth System Sciences 24.12(2020).