On the Non-Stationary Motion of the Bay Water

The motion of the bay water caused by the timely-varying wind force is theoretically treated, and some results are checked by tidal records of Urakami (Wakayama Pref.) in 1941.The following results are obtained by the theory: (1) The seiche is more likely to be developed by sudden stress variation, on the other hand the forced accumulation of water is caused by gradual variation. (2) By the wind of the same variat ion, when the length constant, the shallower the bay, the more like ly is the seiche developed, and when the depth constant, the bay of length de termined by √gh/2v, where √gh is the velocity of the long wave in the bay, and V the abruptness of wind variation, is most oscillated.