The movement of a wharf structure subject to fluctuation of water level

A river side structure, subject to tidal fluctuations with a maximum range of about 6.8m, has experienced movement. The movement leads to the separation of about 1.1m. between the main wharf structure and the access bridge at a joint with the main wharf. A detail program of investigation and monitoring was initiated to gain an understanding of the mechanisms causing the movements. It has been deduced that the total movement observed over a long measurement period is the sum of the daily permanent residual movements resulting from river water level fluctuations.