Response characteristics of internal wave to wind stress in a shallow closed water body

This study was conducted in a shallow reservoir for agriculture to examine the response characteristics of the internal seiche to wind action in a closed water body. A observational results revealed that the frequency characteristics of the wave of density interface change with time corresponding to the unsteady wind action, and that the time delay of internal seiche which corresponds to the wind stress is about almost 25 minutes in Shikinawa Lake. When the Wedderburn number is between 10⁰ to 10², the cycle of the wave in the density interface is almost same as the internal seiche. Moreovr, the value of the Wedderburn number to cause the internal vibration is about 10² in Shikinawa Lake.