WIND EROSION OF RESIDUE WASTE .1. USING THE WIND-PROFILE TO CHARACTERIZE WIND EROSION

A portable wind tunnel is used to assess the erodibility of prepared s urfaces of residue waste. The data are extensive and include wind prof iles, collections of saltation and suspension material as well as part icle sizing by elutriation. Still, the data show no definitive informa tion on the effects of treatment. The experiments, however, can be cha racterized by the structure of the measured wind profile; a special pl ot of the friction velocity and dynamic roughness suggests that only o ne of the six plots is ''all erodible''. Surfaces may have a fixed rou ghness, eroding roughness or exhibit an anomalous ''constant friction velocity''. There are difficulties in the use of the gradient of the l og profile and the intercept as measures of the shear stress and the s cale.