EXPERIMENTAL STUDY ON STABILITY OF COUNTER-WEIGHT BLOCK AGAINST TSUNAMI INDUCED CURRENT

Abstract

 This study investigated the stability of the counter-weight block (CWB) against tsunami-induced current through breakwater openings was investigated by hydraulic experiments; CWB was originally developed as reinforcing countermeasure for breakwaters against tsunamis and waves. The Isbash formula was used to evaluate stability of CWB. It was found to be difficult to evaluate the Isbash number based on the flow velocity alone since the Isbash number varies with the model scale and initial water depth. However, it is possible to properly evaluate the Isbash number using the Froude number. In addition, it was clarified that the fluid force on the CWB was highly correlated with the Fluid number, and the stability assessment of CWB is possible to use the Fluid number.