名古屋港付近の潮流に関する水理模型実験について(2)

Abstract

In 1959, an abnormal storm-surge, which was caused by the so-called "Ise-BayTyphoon", attacked the coasts along Ise Bay and brought huge damages to NagoyaHarbor and its vicinity, which lie in the inner part of the bay. Since then, a plan ofbreakwater construction for prevention of storm-surge damage has been proposed atNagoya Harbor, and its works are now under construction. At the same time, thereclamation works inside the breakwater are also in course of construction. It issupposed that various hydraulic phenomena in this sea area will be changed more orless after completion of these plans. Among them, the phenomenon concerning tidalcurrent has been treated in our experiments.In order to investigate the behaviors of tidal currents in this sea area after con-struction of the breakwater and the reclaimed lands, hydraulic model experiments havebeen carried out in laminar regime. The entire Nagoya Harbor, its adjaceiet sea area, and tidal rivers have been reproduced in the model with fixed-bed. The horizontalscale of the model is 1/700 and the vertical one is 1/500, which were decided by thelaw of dynamical similitude for hydraulic models involving tidal motion previouslyproposed. Semi-diurnal tides of 24 minutes period and tidal currents have been re-produced by the use of a pneumatic tide generator automatically controlled. Water levelsin the sea area and tidal rivers, current velocities at two harbor entrances, and tidalc:urrent patterns have been investigated in two geographical features.After these experiments it has been clarified that:Concerning the current velocities at two harbor entrances, their maximum valuesappear when the tidal curves cut the mean sea level at both flood and ebb.As to the spatial maximum current velocity U., , , , , , at the harbor entrance, theobserved values nearly agree with the theoretical ones deduced from condition ofcontinuity, which are