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原文传递 DYNAMIC SQUAT AND UNDER-KEEL CLEARANCE OF SHIPS IN CONFINED CHANNELS

题名：	DYNAMIC SQUAT AND UNDER-KEEL CLEARANCE OF SHIPS IN CONFINED CHANNELS
作者：	Chris HEWLETT; Larry DAGGETT; David STOCKS; Vladimir ANKUDINOV; D and P ARLINGTON; Andr?TASCHEREAU
关键词：	DYNAMIC SQUAT ; UNDER-KEEL CLEARANCE
摘要：	Throughout the last decade, practical use of the global positioning satellite (GPS) system for geographic positioning has been gradually enhanced through improved satellite availability and software and hardware developments. The availability of these measurement techniques has allowed the determination of ship behavior in confined waterways, including ship dynamic squat, trim, heel, and under keel clearance to accuracies never before possible. The paper will present results from two studies in which dynamic shipboard DGPS position measurements were used as the basis upon which to calculate under-keel clearance. The two studies were conducted in the Panama Canal and the St. Lawrence Seaway, both involving confined canals and trench channels in open lakes. In addition to time and three-dimensional position of GPS gauges, data obtained during the studies include, ship particulars, water surface elevation, engine rpm and rudder movement, channel bottom elevation and lock filling and emptying records. Ship under-keel clearance is a site-specific phenomenon and its analysis is, fundamentally, an analysis of squat; therefore, the paper will primarily focus on the latter. Under-keel clearance is usually obtained from GPS gauge elevations by subtraction of vertical distances to the ship’s keel (physically measured) followed by subtraction of coinciding channel bottom elevations from independent surveys. The paper will discuss these results as well as ship behavior during meetings in confined channels and comparison of measured squat from different types of ships to that calculated from several widely used empirical methods. A third study in the Houston Ship Channel was mentioned also.
总页数：	Proceedings of the 30th PIANC-AIPCN Congress. Sydney Australia. 22-26 Sept. 2002. pp14
报告类型：	科技报告