STUDY ON EFFECTS OF VARIOUS COUNTERMEASURES FACILITIES AGAINST STORM SURGE IN SAGA PLAIN

Abstract

 Effects of various countermeasures facilities for storm surge in the Saga plain are investigated using the storm surge simulation. First, the worst typhoon course for the Saga plain was determined by simulating storm surges under various courses of catastrophic typhoon. Subsequently, effects of various countermeasures facilities against storm surge such as the dike raising, the ancient dikes on land which made along coastline in the past, the coastal road on banking near the Ariake Sea and discharge pumps on storm surge inundation were verified. To investigate the changes in the inundation depth, areas and start time due to the countermeasures facilities has been quantitatively clarified. Although the damages are mitigated in some areas, the damages in some areas are amplified due to the countermeasures facilities.