DOI: 10.5194/hess-24-5903-2020
论文题名: A new criterion for determining the representative elementary volume of translucent porous media and inner contaminant
作者: Wu M. ; Wu J. ; Wu J. ; Hu B.X.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 12 起始页码: 5903
结束页码: 5917
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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162523
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Hydrology and Earth System Sciences,2020-01-01,24(12)