PRESSURE PROPAGATION VELOCITY AND PRESSURE ATTENUATION CHARACTERISTIC OF TSUNAMI IN ICE-COVERED RIVER

Abstract

This study aimed to clarify the pressure propagation velocity and pressure attenuation characteristic of tsunami in ice-covered river. We carried out a hydraulics experiment for tsunami in ice-covered river. This research clarified the following things. The pressure propagation velocity of a fix-ice case is rapid as compared with an open-water case and free-ice case. This velocity of free-ice case becomes later than open-water case. In free-ice case, the pressure propagation velocity becomes late when ice-size becomes smaller. The pressure attenuation of a fix-ice case is largest. If ice-size becomes small, pressure will not attenuate. When ice-size is small, the dispersion wave train of the same phenomenon as open-water case happens. On the other hand, When ice-size is big, It stops that dispersion wave train happens.