Accession Number:

AD0252646

Title:

TRANSIENT WIND TIDES IN SHALLOW WATER

Descriptive Note:

Corporate Author:

COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS

Personal Author(s):

Report Date:

1961-01-01

Pagination or Media Count:

1.0

Abstract:

Transient wind tides were studied in a laboratory channel with various water depths and wind velocities. The transient wind tide studies were divided into two parts 1 the surface time history, and 2 the transient water motion. The water surface set-up will overshoot its steady-state value by a factor of 2. This factor is slightly higher for the deeper water depth and smaller for the shallower water depths. The surface current reaches steadystate very quickly and has a value of 130 of the average wind velocity passing over the surface for a Reynolds number of 2000 or greater. The water also oscillates, and one can predict its oscillatory magnitude by using the standing wave equations with the wave height, the height of the maximum set-up. Finally, a return flow in the lower layers overcomes the slowly damped oscillatory motion and a steady-state flow is established. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE