TY - JOUR
T1 - Estimation of the Surface Stress from the Streamwise Pressure Gradient : The Karman Integral Momentum Equation Revisited
AU - Findlater, P.A.
AU - Scott, W.D.
AU - Greenhill, S.A.
AU - Hopwood, Jenny
PY - 2005
Y1 - 2005
N2 - A method is developed to estimate the stress at the surface in a portable wind tunnel for wind erosion studies. The boundary layer height and the pressure gradient are used in a simple expression from the Karman Integral Momentum Equation. Values of friction velocity u(*) are within 10% of experimental values obtained through correlation techniques, including measurements of differential pressures with the Murdoch Turbulence Probe MTP and the X-wire, hot-wire anemometer XWA. Wind velocity and stress profiles reveal logarithmic trends and a 'constant stress layer' near the surface in the DAWA portable wind tunnel. Realignment of the statistics with the mean wind is essential.
AB - A method is developed to estimate the stress at the surface in a portable wind tunnel for wind erosion studies. The boundary layer height and the pressure gradient are used in a simple expression from the Karman Integral Momentum Equation. Values of friction velocity u(*) are within 10% of experimental values obtained through correlation techniques, including measurements of differential pressures with the Murdoch Turbulence Probe MTP and the X-wire, hot-wire anemometer XWA. Wind velocity and stress profiles reveal logarithmic trends and a 'constant stress layer' near the surface in the DAWA portable wind tunnel. Realignment of the statistics with the mean wind is essential.
U2 - 10.1007/s10652-005-6203-4
DO - 10.1007/s10652-005-6203-4
M3 - Article
SN - 1567-7419
VL - 4
SP - 367
EP - 383
JO - Environmental Fluid Mechanics
JF - Environmental Fluid Mechanics
IS - 4
ER -