ABSTRACT

It is known that the ship's entering is limited at Japanese coastal harbors under severe wave conditions. This limit condition becomes difficult to maintain the on-schedule service and safety of the maritime transportation. In this paper, authors review the method of wave forecast at the turning point of the ship near harbor entrance. In other words, we study to establish a supporting system for ships to enter the harbors so that the fishermen can pass the dangerous point of operation under rough weather conditions at small wave grouping.

1. INTRODUCTION

It is known that the ship's entering is limited at the Japanese coastal harbors under severe wave conditions (Kubo, et al., 1993). This limit is critical for the on-schedule service and safety of the maritime transportation (Kubo, et al., 1994). According to the studies based on the actual measurement and questionnaires, they reveal that the most dangerous point of ship operation would be the turning point where rolling, yawing and broaching can happen at the same time (Kubo, et al., 1995). In this paper, the authors review the method of wave forecast at the turning point. In other words, the authors study to establish a supporting system for ships to enter harbors so that fishermen can pass the dangerous point of operation under rough weather conditions at small wave groupings. This paper proposes the wave forecast that aims at helping the fishermen decide whether the ship's entry is possible or not and when is the best timing for entry under rough weather conditions.

2. WAVE DATA IN USE
2-1 Observed wave data (Sea of Japan data)

The wave data are those observed during the experiment of 27 days from December 20, 1999 to January 15, 2000 at Kasumi-nishi Fishing Harbor in Hyogo Prefecture.

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