Abstract
Considering the fact that navigation channels were blocked by drifting objects at ports in northeast Japan at the East Japan Great Earthquake, one part of Waterways to be Developed and Preserved in Tokyo Bay (Central Navigation Channel of Tokyo Bay) was largely expanded so that vessels can safely take refuge in the event of tsunami attacks on Tokyo Bay. On the other hand, as the said expanded water area was originally utilized for refuge for typhoons, the effectiveness of the area as typhoon refuge needs to be confirmed once again.
In this study, vessel behavior was compared between the case of tsunami and typhoon, focusing upon time series transition of number of vessels and size of anchorage area per vessel, in order to evaluate whether or not the said water area can be also safely utilized as refuge in the event of typhoons.
