ABSTRACT
In the seventies of the past century the elements of an immersed tunnel, which were constructed in a separate building pit, had to be towed through a small river with tidal movement to the trench where they were immersed. As the dimensions of the elements were impressive (50 m wide, 7.5 m high and 110 m long) compared to the dimensions of the river (100 m wide at the bottom, variable depth due to the tidal wave between 8.5 m and 10.0 m) and as the water in the river flows with considerable velocities, which also change direction due to the tidal movement, it was decided to perform laboratory investigations in order to estimate the forces necessary to control the elements during the transportation phase.
