Abstract
Storm surges increase inundation risk according to Sea-Level Rise by global warming. To draw out long-term coastal zone management plan in consideration of countermeasure budget and environmental conservation, we should assess the inundation area along all coasts including low-risk area. This study implemented the risk assessment of the inundation generated by an overflow and a wave overtopping on storm surge along Ibaraki coast, where defense systems including sea walls have been constructed so storm surge disaster has been rare. The inundation area calculated by this study was not large, because an overflow on these sea walls did not break out even under Sea-Level Rise. The long-term management option for disaster prevention at this coast will be development of countermeasure against the wave overtopping on Sea-Level Rise or modification of land use plans.
