開水路底面摩擦変動スペクトルの測定

Abstract

Studies on the effects of a turbulent wall shear are b coming to be required in the fields of hydraulics. This paper plesents the power spectra of the wall shear flucturations computed from directly measured bottom shear in an open channel. The obtained spectra show that there exists two regions in which the spectral laws of shear are k3 and k9 in a lower wave number range, where k is the wave number. It seems that the spectral laws of shear k3 and k9 correspond to the spectral Jaws of energy k1 and k4 in a theory of isotropic turbulence, respectively.