余裕水深決定のための潮汐表の精度-II : 日本の主要23港

概要

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In shallow waters like harbors, water ways and so on, it is quite important for navigators to determine the suitable and safety Under-Keel Clearance taking account of the water depth, her draft and squat by the shallow water effect and so on. And at first, required is the correct estimation of the sea level from the Tide Tables. Based on the one-year long tidal data at 23 main ports in Japan, accuracy of the Tide Tables' estimated values, the height and time at high and low water, was examined. In most of the main ports, the difference between estimated and observed tidal heights (observed value minus estimated value) fluctuates with a period of about half a month. On the other hand, the difference between estimated and observed high (low) water time changes irregularly. The monthly mean of the height difference is maxmum in spring and minimum in summer or autumn. The variation of the monthly mean and the standard deviation of the time difference are quite large in Osaka and Kobe Ports.
社団法人日本航海学会の論文
1996-09-25