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

VL - 4

SP - 367

EP - 383

JO - Environmental Fluid Mechanics

JF - Environmental Fluid Mechanics

SN - 1567-7419

IS - 4

ER -