If the wind speed is 1.5m/s(3.4mph) at a height of 10m(32.8ft) under F stability, estimate the friction velocity if the surface roughness is 3cm (1.18 in) and the displacement height is negligible. (Use the equation below to solve the problem. Enter your answer in the box and then click 'Submit.') u=ku0[ln(zozdo)+a(Lz)] Friction velocity: m/s For stable atmospheric conditions, the wind speed profile can be represented as: u=ku0[ln(z0zd0)+a(Lz)] - u is friction velocity - k is von Karman's constant (typically 0.4) - z is height above grade z0 is surface roughness d0 is displacement height (i.e., elevation where wind speed is 0 ) is the Monin-Obukhov length coefficient (5.2 for stable conditions) - L is the Monin-Obukhov length (a measure of stability class defined as