EXPERIMENTAL STUDY ON ATTENUATION OF RANDOM WAVES UNDER ICE SHEET
Shigeki Sakai, Makoto Sasamoto, Xiodong Liu and Jun-nosuke Katayama, Iwate Univ., Dept. of Civil, Eng. 4-3-5 Ueda, Morioka, 020 Japan
Shigeo Kanada and Koh Izumiyama, Ship Research Institute; 6-38-1 Shinkawa, Mitaka, Tokyo, 181, Japan
ABSTRACT
Experiments are performed to examine the random wave attenuation under ice sheet Random waves in the present experiments have JONSWAP Type spectrum. The power spectrum density auenuates exponentially with the increase of distance from the ice edge. Attenuation rate of each frequency component depends on the ice thickness and its frequency and is almost similar to that of regular wave with the same frequency. This agreement indicates that the attenuation of random wave can be expressed by a linear summation of frequency component attenuation which is analyzed as a regular wave.
