Abstract
Artificial island developments are being planned and constructed one after the other in the semi-enclosed coastal area. The decision plan of such a project is made usually on the basis of environmental assessment which is done from the various view points. The analysis of tidal currents is always included in the assessment that is aimed to evaluate the changes of tidal flow pattern due to the existence of an artificial island. Such an evaluation, in many cases, is made through the numerical simulation and/or the physical experiment that deals with the phenomena during a few tidal cycles.
In this paper, a numerical scheme was presented that evaluates the tidal exchange aimed at the environmental assessment. Some imaginary model simulations dealing with the tidal exchange phenomena between the semi-enclosed bay and the outer sea were done by using the presented. scheme. The simulations showed the evidence that a slight change of tidal currents has the possibility to cause a serious influence on the tidal exchange during a long time-span. On the basis of such evidence, it was suggested that the analysis of tidal exchange during a long time-span is important and is necessary in future for the environmental assessment on tidal flow.
