Analysis of the Disaster Environmental Change Considering Climate Change : 1. Analysis of Flood Elevation

Recently, the increase of the abnormal flood events mainly due to the climate change led the severe casualty and property damages particularly in the small and medium size of watersheds. Therefore, in this study, the water level changes cased by climate change in the mainstream and tributaries of the Nakdong river basin were analyzed. As results, 0.35~0.74 m of the water levels in the mainstream were changed and 0.47~0.72 m of alteration in the tributaries. To evaluate the effect of climate change, the expected differences on the relationship between return period and flood level in the tributaries were evaluated using the existing data in the basin plan report for the Nakdong river basin. Also, the effected areas by the climate change were analyzed using the water level alterations caused by climate change and the resulted flooding area in the Nakdong river basin was increased 6.45% in maximum with the consideration of climate change. It is therefore expected that the proposed method to estimate the effected area by climate change might provide the basic information on developing natural disaster mitigation strategies.