Numerical Analyses of Oscillations in Harbors of Various Shapes

Abstract

A numerical model based on nonlinear shallow-water equations is applied to study oscillations in harbors of different shapes represented in 'L'-type, triangle, 'I'-type with different width, 'I'-type with a narrow strait, and 'C'-type. The second mode shows a higher amplification ratio at the head of an L-type harbor as its bending position is nearer to the harbor mouth. As a narrow strait is located nearer to the mouth of an I-type harbor, amplification ratios of the first and second modes at the harbor head are lower and higher, respectively. A C-type harbor shows rather complicated amplification ratios because the phase difference between waves propagating through two harbor mouths depends on the position inside the harbor. Harbor oscillations in I-type harbors where the still water depth is distributed are also simulated.