“Go/no go” Decision of the Immersion Work made by the Current Forecast System in Bosphorus Tube Crossing

Abstract

The Bosphorus tube crossing, which is constructed by the immersion tunnel method, is now under construction in Turkey. The current of Bosphorus strait has two-layer current system and it is very variable due to meteorological condition. The immersion process, towing, mooring and lowering, should be executed continuously, so it must be confirmed before towing that the current condition meets the construction limitation among the immersion work. The authors have already developed the current forecast system and it is in operation on the site. In this paper, the verification result and the process making the “go/no go” decision are described.