Solitary Wave-like Ship Induced Waves and Its Associated Currents in a Water Channel of Narrow Width

摘要

In the narrow water channel,which has been frequently deployed in the artificial canal in the South Korea due to the lack of available land,solitary wave type ship induced waves can occur.In order to test this hypothetical view,we carried out the numerical simulation.Numerical model consists of Navier-Stokes Equations and VOF,and the verification is implemented using the data by PIANC (1987) and the analytical model derived in this study.It was shown that numerically simulated front wave height are much larger than the one by PIANC (1987),and the fluctuation of free surface near the channel bank persists much longer (around 20s).For the case of stern waves,numerically simulated wave height are somewhat smaller than the data by PIANC (1987).These results seriously deviates from the general characteristics of ship induced waves observed in the wide water channels,and leads us to conclude that ship induced waves is severely affected by the width of water channel.It was also shown that the currents from the channel banks toward a ship,and currents from the ship toward the channel banks are alternatively occurring due to reflection at the channel banks.The velocity of currents reaches its maximum at 0.90 m/s,and these values are sustained through the entire depth.which implies that severe scourings at the channel bottom can be underway.