Modelling of soil fragmentation dynamics

Misra, R. K. and Sands, P. J. (2006) Modelling of soil fragmentation dynamics. In: ISTRO 17th Triennial Conference, 28 Aug - 3 Sept 2006, Kiel, Germany.

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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.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: No
Item Status: Live Archive
Additional Information: No evidence of copyright restrcitions on web site.
Depositing User: Dr Rabi Misra
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 00:47
Last Modified: 02 Jul 2013 22:38
Uncontrolled Keywords: Aggregate hierarchy, Aggregate stability, Fragmentation, Model, Soil structure
Fields of Research (FOR2008): 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
URI: http://eprints.usq.edu.au/id/eprint/1543

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