Experimental study on effect of wave set-up in storm surge

The storm surge height is usually determined as the surplus of height suctioned by atmospheric low pressure and that drifted by strong winds. These two models have been investigated for many years to resolve mechanisms of storm surges in inner bays. In the outer bay areas, some numerical models demonstrate the effect of wave set up cannot be neglected in the total deviation of storm surge. Almost all numerical models employ linear superposition of the original storm surge deviation and wave set up level. However, wave set-up itself is nonlinear phenomena and the mechanism is not clearly revealed. The paper describes an experiment employed in a newly developed Tsunami and Storm Sure Reproducing Channel (45m × 4m× 2m). The channel generates the following three types of wave and currents: 1) Soliton type tsunami and irregular waves by piston type wave generator; 2) Uni-directional and bi-directional current by current generator; 3) Tsunami generated by ice-break, volcano eruption etc. using overhead water tank. In the experiment, storm surge was reproduced by the current generator and the stormy wave was generated by the piston type wave maker. Spectra analysis and unit wave analysis are carried out and the nonlinear effect included in storm surge deviation in shore line is discussed.