Abstract

An empirical formula to estimate the properties of the local strong whirlwind behind a peninsula was derived from the results of wind tunnel measurements using some simplified terrain models with trapezoidal cross sections. The terrain parameters discussed in the tests were the height of the peninsula, the upstream and downstream slope angles, the crown width and the end slope angle. As the results indicate, it became clear that the extent of the strong wind behind the peninsula is dependent on the direction of approaching wind, and that the speed up ratio near the ground level is controlled by all terrain parameters discussed in this study.

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