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.
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.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||No evidence of copyright restrcitions on web site.|
|Uncontrolled Keywords:||Aggregate hierarchy, Aggregate stability, Fragmentation, Model, Soil structure|
|Subjects:||300000 Agricultural, Veterinary and Environmental Sciences > 300100 Soil and Water Sciences > 300104 Land Capability and Soil Degradation
290000 Engineering and Technology > 291100 Environmental Engineering > 291101 Environmental Engineering Modelling
300000 Agricultural, Veterinary and Environmental Sciences > 300100 Soil and Water Sciences > 300101 Soil Physics
|Depositing User:||Dr Rabi Misra|
|Date Deposited:||11 Oct 2007 00:47|
|Last Modified:||02 Jul 2013 22:38|
Actions (login required)
|Archive Repository Staff Only|