2012 年 68 巻 2 号 p. I_176-I_180
Tsunami intrusion into river is investigated in this study. Investigation and analyses were conducted based on water level measurement data and bed slope at several rivers in Tohoku region during The Great East Japan Tsunami, 2011 and The Great Chillean Tsunami, 2010. These data were used to proposed an empirical method for estimating dissipation coefficient. The empirical method was used to approach the intrusion length by assuming that the furthest distance is given for the ratio of local tsunami wave height to the tsunami wave height at the river entrance of 0.05 (5%). The intrusion length from the proposed method in this study shows good comparison with measurement data.