With Robins (1979), for su/u and sv/u, no change with stability is
assumed. Deviating from Robins (1979), sw/u is taken to be
stability-dependant, assuming an increasing importance of sw
compared to u in unstable conditions. The ratios derived from ultrasonic
anemometer measurements at Kittsee show a dependence
also of su/u and sv/u on stability and especially larger values for
unstable conditions. The dependence of sw/u on stability is in the
range of our assumptions, with generally lower values.