Quantifying minimum monolith size and solute dilution from multi-compartment percolation sampler data

De Rooij, Gerrit H., Cirpka, Olaf A., Stagnitti, Frank, Vuurens, Saskia H. and Boll, Jan 2006, Quantifying minimum monolith size and solute dilution from multi-compartment percolation sampler data, Vadose zone journal, vol. 5, pp. 1086-1092.

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Title Quantifying minimum monolith size and solute dilution from multi-compartment percolation sampler data
Author(s) De Rooij, Gerrit H.
Cirpka, Olaf A.
Stagnitti, Frank
Vuurens, Saskia H.
Boll, Jan
Journal name Vadose zone journal
Volume number 5
Start page 1086
End page 1092
Publisher Soil Science Society of America
Place of publication Madison, Wis.
Publication date 2006
ISSN 1539-1663
Keyword(s) BTC
breakthrough curve
multicompartment sampler
spatial solute distribution curve
Summary Preferential flow affects solute transport in natural soils, leading to high spatiotemporal variation of concentration. A multicompartment solute sampler (MCS), yielding multiple breakthrough curves at a given depth, can monitor tracer movement in a heterogeneous soil. We present a technique to estimate from MCS data whether a soil monolith is sufficiently large to capture preferential flow, which is a necessity for tracer breakthrough curves to be representative. For several soils, we estimate that an MCS should be larger than 0.1 to 0.2 m2. We also expand dilution theory to analyze the concentration variations of a tracer passing the control plane monitored by the MCS, in addition to the conventional plume spreading analysis. We characterize the set of locally observed breakthrough curves by the entropy-based dilution index. For given first and second-central moment, the spatially uniform log-normal breakthrough curve maximizes the dilution index. The ratio between observed and maximum dilution index is denoted reactor ratio. For a 300-compartment solute sampler, covering an area of 0.75 m2, we compute a reactor ratio of 0.665, compared with 0.04 for stochastic-convective and 1 for convective-dispersive transport. With a single, large collector the reactor ratio would be 0.958, severely underestimating concentration variations. Large collector areas are clearly inadequate to estimate dilution. Values of the dilution index and the reactor ratio for individual sampling compartments indicate efficient longitudinal mixing in most but not all cases, and considerable spatial variation of the leaching process.
Notes Published online 3 October 2006
Language eng
Field of Research 040608 Surfacewater Hydrology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Soil Science Society of America
Persistent URL http://hdl.handle.net/10536/DRO/DU:30009041

Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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