Abstract
The long period waves observed in harbor inside may consist of free waves not only propagated from offshore but also generated on harbor entrance due to reduction of wave groups by diffraction and breaking. In this study, a harbor tranquility analysis for long period waves is conducted by using Boussinesqtype wave transformation model with model verifications. The offshore long wave heights are estimated from wind waves with a newly proposed relationship of them, and the generated long wave heights on harbor entrance are estimated from the results of calculation for wind wave transformation. A harbor tranquility analysis for the generated long waves on harbor entrance is more appropriate because the directional spreading of their component waves may be reproduced in calculation of wave transformations.
