2023 Volume 79 Issue 18 Article ID: 23-18140
In this study, topographic change analyses were conducted for the Sendaigawa River mouth with Tottori Port located in the eastern part of Tottori Prefecture, Japan, with various ocean current conditions to clarify the sedimentation mechanism at the port during floods. A two-dimensional shallow-water flow model with a high-order accurate advection solution was used in the analyses, and the target flood was the July 2018 torrential rainfall flood. The results of the analyses indicate that for a flood discharge of 2,000 m3s–1 class, regardless of the current conditions, sedimentation may occur in the Sendai Passage, but not large-scale sedimentation in the port. In the case of a flood discharge of 3,000 m3s–1 class, it was found that the flow situations differ greatly depending on slight differences in the current conditions. In the case of weak currents, the possibility of sedimentation from the channel to the port was shown regardless of the direction of the currents. On the other hand, in the case of strong currents, the sedimentation rate in the port may decrease, although the factor varies depending on the direction of the currents.
