Abstract

When a vessel is passing through a shallow part of a fairway (entrance fairway included), due to insufficient depth of fairway, the vessel usually take advantage of high tide level to enhance depth of navigable waterway. In normal situation, we only consider rise of tide and increase of waterway depth, and then the under keel clearance is consequently increased. But what we ignore is that the squat would drop due to the diminishment of relative speed between vessel and sea, when the vessel enters the fairway. Calculation of ship’s squat when she is riding tidal current in a fairway is a foundation of making sure the under keel clearance of a vessel, thus to enhance efficiency of fairway and optimal use of tidal resource.

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