Abstract
Abstract Spectra of velocity fluctuations in mountain winds observed in two Transvaal valleys of very different geometry show that surges with periods the order of 1 hour, and to a lesser extent those with periods 8–20 mins., contribute most to the total turbulent energy of the stable mountain wind. Vertical velocity fluctuations, particularly the upward, are abruptly damped in this stable airflow. Total turbulent energy of both mountain and valley winds depends on the configuration of the parent valley, while the form of the spectrum is shown to be sensitive to the occurrence and amount of cloud cover. Thus increasing cloud cover results in a displacement of eddy energy in the direction of lower frequencies.
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