Abstract
At the Misawa fishing port, the offshore breakwater was built as a countermeasure against the calmness of waterway. However, deposition on waterway became remarkable after construction of the breakwater, and that could be caused to the trouble to waterway. So, in this research, the analysis using the observation results of suspended sediment and suspended sediment model was performed for countermeasures against shoaling at waterway and mitigation of influence of the seashore on nearby. It turned out that the floating silt-clay does not sediment but it is transported to neither the port entrance nor harbor inside. Moreover, this model has estimated the tendency of shoaling at waterway, and burying countermeasures against shoaling at waterway was proposed using this model.
