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Project Overview

Project Number
M0291
Program Area
Project Theme
Mining Technology

The research programme provided a preliminary guide for designers concerned with the required still water Under Keel Clearance (UKC) and still water Water Plug Height (WPH) of air-lifted Gravity Based Structures (GBS) with skirts, for floatout through very shallow (<12m) water in a mild seaway. The modelling provided an excellent understanding of the effects of trapped air volumes on wave-induced dynamic motions, for varying values of UKC. The effects of UKC reduction were evaluated in the range of 1.4 – 10.4m for the prototype. At the upper end of this range substantial attenuation in both Heave and Pitch occurs with reduction of UKC, while different trends were found in the lower end of the range.

Page was last reviewed 7 July 2020

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