Release of Escherichia coli under raindrop impact: The role of clay

•E. coli release from soil without clay was much higher than from soils with clay.•Clay decreases the penetration of raindrops into soil.•The Gao model simulated E. coli release from both pure sand and clay-sand mixtures. A recent paper by Wang et al. (2017) showed that the release of Escherichia co...

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Bibliographic Details
Published in:Advances in water resources 2018-01, Vol.111, p.1-5
Main Authors: Wang, C., Parlange, J.-Y., Schneider, R.L., Rasmussen, E.W., Wang, X., Chen, M., Dahlke, H.E., Truhlar, A.M., Walter, M.T.
Format: Article
Language:English
Subjects:
Bacteria
Clay
Clay soils
E coli
Erosion
Escherichia coli
Kaolinite
Nonpoint source pollution
Overland flow
Rain
Raindrop impact
Raindrops
Rainfall
Rainfall simulators
Sand
Simulated rainfall
Soil
Soil columns
Soils
Storm runoff
Studies
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Summary:•E. coli release from soil without clay was much higher than from soils with clay.•Clay decreases the penetration of raindrops into soil.•The Gao model simulated E. coli release from both pure sand and clay-sand mixtures. A recent paper by Wang et al. (2017) showed that the release of Escherichia coli (E. coli) from soil into overland flow under raindrop impact and the release of clay follow identical temporal patterns. This raised the question: what is the role of clay, if any, in E. coli transfer from soil to overland flow, e.g., does clay facilitate E. coli transfer? Using simulated rainfall experiments over soil columns with and without clay in the matrix, we found there was significantly more E. coli released from the non-clay soil because raindrops penetrated more deeply than into the soil with clay.
ISSN:0309-1708
1872-9657
DOI:10.1016/j.advwatres.2017.10.028