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Abstract

In this study, we simulated the hydrodynamics of the waters near the Keelung Harbor entrance and fairway before and after harbor expansion. The simulation results are used to discuss the impact of changes in the current characteristic on the inbound vessels. With reference to the fairway planning of Keelung Harbor, the simulation results before the expansion show that the current velocity with inbound fairway during the flood tide ranges from 0.08 to 1.03 m/s. Current direction was affected by the east breakwater, and a circulation occurs near the harbor entrance. After the expansion, during the flood tide, counterclockwise circulations occur near the east breakwater. For the flood tide, current velocity ranges from 0.02 to 0.65 m/s, and during the ebb tide, the current flows to the northeast, and the current velocity ranges on the inbound fairway between 0.07 and 1.22 m/s. Comparing the data on the inbound fairway before and after expansion, the current velocity at the harbor entrance increases. After passing the existing east breakwater for an additional 400 m, the current velocity at the harbor entrance is greatly reduced. Through the calculation results of this study, the necessary conditions for the safety of inbound navigation are provided to avoid the deflection caused by difference in the current at the bow and stern and the resulting improper handling.

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