Basic Research on Operational Troubles for Ships and Harbours Due to Abnormal Water Levels

摘要

It is very important to know the ebbs and flows of tides from the viewpoint of ship operations. However, abnormal water levels are being widely observed. These conditions cause various challenges among waterfront facilities. In this study, the present situations and challenges to ship operations in abnormal water levels due to tides are researched. A nationwide questionnaire was conducted to learn from operators of ships and harbours. The results of the questionnaire indicated that there are many difficulties related to operations as ships are berthing, maneuvering in shallow waters, and loading and unloading passengers and cargo. However, there are no effective measures with which to counter these difficulties. These problems are particularly serious for water-buses that navigate the rivers. In this study, the current problems are statistically analyzed based upon comments received from operators.