Wind Erosion in Western Queensland Australia

Figure 2.11 Conceptual model of land erodibility, expressed as a function ofsurface roughness effects due to vegetation cover (top) and soilerodibility (bottom). Land erodibility is determined by the relativeconditions of surface roughness and soil erodibility. In turn, thesecontrols are regulated by climate and land management conditions. ..............66Chapter 3: Approaches to Modelling Land Erodibility to WindFigure 3.1 Space-time plot showing the spatial and temporal scales of winderosion models reviewed in this chapter. Light gray boxes representfield scale models (Section 3.2), white boxes represent regional scalemodels (Section 3.3), and dark gray boxes represent global scalemodels (Section 3.4) ........................................................................................70Chapter 4: A Framework for Modelling Temporal Variations in SoilErodibilityFigure 4.1 Flow chart illustrating the relationships between soil erodibilitycontrols within a landscape. Grey boxes represent environmentalconditions and processes that determine soil surface conditions and theimpact of disturbance mechanisms on the availability of loose erodiblematerial ..........................................................................................................100Figure 4.2 Graphs illustrating the effect of (a) changing the non-erodible fractionof a soil (%DA > 0.84 mm) on (b) the position of the curve definingthe relationship between soil clay content (percentage clay) and soilerodibility as indicated by the streamwise sediment flux (Q,represented by circles) at a wind velocity of 65 kmh -1 (after Leys et al.,1996). .............................................................................................................107Figure 4.3 3D plot of the soil erodibility continuum as defined by the soilerodibility (indicated by Q gm -1 s -1 ) relationship with soil clay content(percentage clay) and aggregate size distribution that controls thequantity of non-erodible soil aggregates (%DA > 0.84 mm).........................109Figure 4.4 A conceptual diagram of the movement of a soil through the erodibilitycontinuum from minimum (Q min ) to maximum (Q max ) erodibilitystates. The diagram indicates three phases of movement: (i) acondition of minimum erodibility, (ii) a transition phase of increasingxvi