Modelling of soil fragmentation dynamics

Paper

Misra, R. K. and Sands, P. J.. 2006. "Modelling of soil fragmentation dynamics." ISTRO 17th Triennial Conference. Kiel, Germany 28 Aug - 03 Sep 2006 Kiel, Germany.
Paper/Presentation Title

Modelling of soil fragmentation dynamics

Presentation TypePaper
AuthorsMisra, R. K. (Author) and Sands, P. J. (Author)
Journal or Proceedings TitleProceedings of ISTRO 17: Sustainability - its Impact on Soil Management and Environment
Number of Pages6
Year2006
Place of PublicationKiel, Germany
ISBN3981113403
Web Address (URL) of Paperhttp://www.alterra-research.nl/pls/portal30/docs/FOLDER/ISTRO/ISTRO_II/p_publications.htm
Conference/EventISTRO 17th Triennial Conference
Event Details
ISTRO 17th Triennial Conference
Event Date
28 Aug 2006 to end of 03 Sep 2006
Event Location
Kiel, Germany
Abstract

An understanding of soil fragmentation during aggregate breakdown is useful in studies of erosion, tillage and traffic. Modelling efforts in soil fragmentation has largely focussed on characterisation of the size and mass distribution of aggregates using fractal approach and less on the nature and magnitude of the applied energy that produces fragmentation. In this paper, we report a model of soil fragmentation that assumes soil to comprise two fractions: a strongly bound fraction (primary particles) and a weakly bound fraction (aggregates). As the energy input on the soil increases, fragmentation of some of the weakly bound fraction produces an increase in the amount of primary particles. For simplicity, only three size classes of primary particles (sand, silt and clay) are considered. Results show that the model can be applied to soils of a wide range of structures and is capable of producing improved description of aggregate hierarchy. Application of the model to studies of tillage and erosion is discussed.

KeywordsAggregate hierarchy, Aggregate stability, Fragmentation, Model, Soil structure
ANZSRC Field of Research 2020401199. Environmental engineering not elsewhere classified
410605. Soil physics
410601. Land capability and soil productivity
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Byline AffiliationsDepartment of Agricultural, Civil and Environmental Engineering
No affiliation
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