Abstract
Using the transmission (reflexion) coefficients in an L-shaped open channel, which were given in a previous paper (MOMOI, 1974), resonance oscillations in an L-shaped channel with a closed arm at one end are dis-cussed in this paper. In the arm, two types of high resonance are found. One is of a conventional type (kd2<<1 where k: wave number and dj: widths of the windward channel (j=1) and arm (j=2)) which is well known in real harbours open to the sea, and the other is of a specific type (kdj=mπ-ε where m: positive integers and ε: a small number). For the former, we introduce a mouth hypothesis which is useful to explain the behaviors of the resonance (i.e., linearity and odd number fractionality) in rectangular har-bours. In the latter case, the one-degree-lower (m-1)th mode is consider-ably excited at kdj=mπ-ε by degrading the energy of the resonant mth mode.
