DOI: 10.5194/hess-19-3991-2015
Scopus记录号: 2-s2.0-84942693542
论文题名: Technical Note: The use of an interrupted-flow centrifugation method to characterise preferential flow in low permeability media
作者: Crane R ; A ; , Cuthbert M ; O ; , Timms W
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 9 起始页码: 3991
结束页码: 4000
语种: 英语
Scopus关键词: Centrifugation
; Centrifuges
; Fiber optic sensors
; Groundwater flow
; Mass transfer
; Porosity
; Centrifugation methods
; Centrifugation technique
; Centrifuge experiments
; Hydraulic properties
; Multi-rate mass transfers
; Tracer breakthrough curves
; Tracer concentration
; Transport modelling
; Core samples
; advection-diffusion equation
; breakthrough curve
; centrifuge
; concentration (composition)
; hydraulic conductivity
; mass transfer
; permeability
; porosity
; preferential flow
; smectite
; solute transport
; tracer
英文摘要: We present an interrupted-flow centrifugation technique to characterise preferential flow in low permeability media. The method entails a minimum of three phases: centrifuge-induced flow, no flow and centrifuge-induced flow, which may be repeated several times in order to most effectively characterise multi-rate mass transfer behaviour. In addition, the method enables accurate simulation of relevant in situ total stress conditions during flow by selecting an appropriate centrifugal force. We demonstrate the utility of the technique for characterising the hydraulic properties of smectite-clay-dominated core samples. All core samples exhibited a non-Fickian tracer breakthrough (early tracer arrival), combined with a decrease in tracer concentration immediately after each period of interrupted flow. This is indicative of dual (or multi-)porosity behaviour, with solute migration predominately via advection during induced flow, and via molecular diffusion (between the preferential flow network(s) and the low hydraulic conductivity domain) during interrupted flow. Tracer breakthrough curves were simulated using a bespoke dual porosity model with excellent agreement between the data and model output (Nash-Sutcliffe model efficiency coefficient was > 0.97 for all samples). In combination, interrupted-flow centrifuge experiments and dual porosity transport modelling are shown to be a powerful method to characterise preferential flow in low permeability media. © 2015 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78419
Appears in Collections: 气候变化事实与影响
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作者单位: School of Civil and Environmental Engineering, UNSW, Sydney, Australia; Connected Waters Initiative Research Centre, UNSW, Sydney, Australia; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; School of Mining Engineering, UNSW, Sydney, Australia
Recommended Citation:
Crane R,A,, Cuthbert M,et al. Technical Note: The use of an interrupted-flow centrifugation method to characterise preferential flow in low permeability media[J]. Hydrology and Earth System Sciences,2015-01-01,19(9)