THE FORCE OF COLLISION DUE TO DRIFTAGE CARRIED BY TSUNAMI RUN UP ONTO A COASTAL PLAIN

Abstract

 To keep the lives safe against run-up tsunamis, it is important to study the forces due to driftage which collides on refuge towers in the area near the seashore. Colliding forces, therefore, on a column by an object of the size of small boat which drifts by run up tsunami onto a plain coast are investigated with focusing on the momentum change, i.e. the impulse, and compared with the results by tsunamis of solitary waves.
 The following emerge: In comparison with the solitary wave's case, as the front of run-up tsunami has strong power and strong turbulence, the impulse becomes large although the added mass becomes small, and the values are scattered. The colliding acceleration is important parameter because the impulse and the added mass are large when the acceleration is positive and small when negative.