Wind Erosion in Western Queensland Australia
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Wind Erosion in Western Queensland Australia

Modelling Land Susceptibility to Wind Erosion in Western ... - Ninti One Modelling Land Susceptibility to Wind Erosion in Western ... - Ninti One

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10.08.2015 Views

Chapter 5 – Land Erodibility Model DevelopmentFigure 5.1 Map showing the location of the study area within Australia, the extent of the fourbioregions comprising the study area, and the location of meteorological stations used for modelvalidation.5.3 Model Development5.3.1 Land Erodibility ControlsWind erosion occurs under conditions when wind shear forces at the surface exceed theenergy required to mobilize soil micropeds (Bagnold, 1941). The threshold friction velocity(u *t ) of a land surface describes the wind shear velocity (u * ) at which particle entrainment is132

Chapter 5 – Land Erodibility Model Developmentinitiated. As u *t decreases the wind shear velocity required to entrain soil particles and fineaggregates will fall. Conceptually, land erodibility (wind erosion hazard) can be consideredthe inverse of u *t , for as the threshold for particle entrainment decreases susceptibility orerodibility will increase.Land erodibility is a function of soil erodibility, and the presence of non-erodible roughnesselements (rocks, vegetation, landforms) that affect wind erosivity. Chapter 2 described therelationships between these controls, which are illustrated in Figure 5.2.Figure 5.2 Flow chart illustrating the relationships between wind erosion controls within a landscape.Gray boxes represent environmental conditions and processes that determine soil surface conditionsand the availability of loose erodible sediment, and the effect of non-erodible roughness elements onthe wind shear velocity (wind erosivity)133

Chapter 5 – Land Erodibility Model DevelopmentFigure 5.1 Map show<strong>in</strong>g the location of the study area with<strong>in</strong> <strong>Australia</strong>, the extent of the fourbioregions compris<strong>in</strong>g the study area, and the location of meteorological stations used for modelvalidation.5.3 Model Development5.3.1 Land Erodibility Controls<strong>W<strong>in</strong>d</strong> erosion occurs under conditions when w<strong>in</strong>d shear forces at the surface exceed theenergy required to mobilize soil micropeds (Bagnold, 1941). The threshold friction velocity(u *t ) of a land surface describes the w<strong>in</strong>d shear velocity (u * ) at which particle entra<strong>in</strong>ment is132

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