バイオハザード低減のためのバラスト水交換に関する研究 : (その2)オーバーフロー方式において動揺を考慮した水理実験

概要

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Ocean environmental problems due to the contamination of marine life through ballast exchanges are reported from every part of the world today. The damage caused to marine ecology in a given area and the hazards of noxious plankton on public health are regarded as important especially. IMO recommendations for ballast water exchange are taken as effective steps to contain these problem under present conditions. However, the issues involved in ballast water exchanges are complicated due to several factors such as the size of tanks, the number of partition walls and the area and configuration of holes on them, the arrangement of bell mouth, the trim of the vessel, and so on. Because of these factors, there exist several ambiguities in the rate of actual ballast water exchange even when IMO recommendations are followed. The problems caused by ballast water exchanges was studied through hydrological experiments conducted using a numerical model based on actual ballast exchange methods in the first report. In case of some difference of density between an initial filled water and an exchangeing water, or case of some difference of pipe and manhole arrangement in the tank, an efficiency of ballast water exchange rate will change. In this paper as a continued report, hydrological model test on flow-through method is studied through an experiment by considering the pitching condition.
社団法人日本船舶海洋工学会の論文
2004-03-20