Abstract
In the port and coastal construction projects, there is environmental research for environmental assessment. However, the investigation time is often limited for cost and process. In this study, a proposed method using a HEP the following conclusions were obtained. The adhesion of sessile organism and their habitat was affected by waves and tidal fluctuations. The model can reproduce the number of sessile organism by applying the relationship between tidal fluctuations and the number of sessile organism. It can also apply into the environmental assessment evaluation, in the port and coastal construction projects.