トレンチ工法による港内波浪の静穏化に関する研究

抄録

In order to reduce wave heights in a harbor, an artificial trench installed in front of theharbor entrance was newly proposed as alternative works of detached and offshore breakwaters. Based on the wave refraction mechanism by water depth variations, change of wave propagation direction by the artificial trench is realized. Several factors regarding artificial trenches, such as locations, sizes, plane figures and so on, were examined theoretically by the numerical method of analysis. For the comparison, effectiveness of a rectangular resonator for harbor tranquility was also examined. It was confirmed that artificial trenches with a circular and rectangular figures are effective for reducing incoming waves to the harbors, especially for normal incidence of waves to that entrance.