THE EFFECT OF SHEAR STRENGTH AND MOISTURE CONTENT ON THE FLUID VELOCITY THRESHOLD OF WIND EROSION
AbstractWind erosion is an important component of coastal dune morphodynamics, and has been subject to research since decades (e.g., Bagnold 1941; Han et al. 2009). However, many expressions to predict fluid threshold velocity for wind erosion are not generally valid. For instance, Han et al. (2009) showed that some expressions struggle to predict the threshold velocity for tropical and/or humid coastal areas. We hypothesize that a shear strength limit equilibrium approach can incorporate the effects of moisture content, particle sorting and shape, slope angle, and cohesion into a general equation that would be applicable to a range of environmental and soil conditions. The objective of this study is to test this hypothesis using data sets published by McKenna-Neuman and Nickling (1989).
Brooks, and Corey (1964): Hydraulic properties of porous media, Hydrology Papers, Colorado State University, Vol. 3, pp. 37.
Duncan, Wright, and Brandon (2014): Soil strength and slope stability. Hoboken, New Jersey: Wiley.
Fécan, Marticorena, and Bergametti (1999): Parametrization of the increase of the aeolian erosion threshold wind friction velocity due to soil moisture for arid and semi-arid areas, Annales Geophysicae, Vol. 17, pp. 149-157.
Han, Qu, Zhang, Zu, Niu, and Liao (2009): Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China, Geomorphology, Vol. 104, pp. 230-237.
Lu, and Likos (2004): Unsaturated soil mechanics.
Hoboken, N.J: J. Wiley. McKenna-Neuman, and Nickling (1989): A Theoretical and wind tunnel investigation of the effect of capillary water on the entrainment of sediment by wind, Soil Science, Vol. 69, pp. 79-76.
Ravi, Zobeck, Over, Okin, and D'Odorico (2006): On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion, Sedimentology, Vol. 53, pp. 597-609.
Taylor (1948): Fundamentals of soil mechanics, (Wiley, Ed.) (1st ed.). New York.