Evaluation for Characteristics of Flood Plain in Urban Area by Geographic Information on Space and Time

本文利用地形图、航空照片和GIS卫星数据，对日本三笠河、大分河、乌佑多河、白拉河等城市河流洪泛平原的地面条件及其变化进行了研究。考虑了过去发生自然灾害地区的地面条件。结果表明，利用这些地理信息对河漫滩进行分析，可以从河滨地区地面条件的分布特征及其变化特征来定性定量地评价城市地区的自然灾害。证实了GIS分析过程不仅适用于冲积平原，也适用于沿海平原和国外冲积平原。

In this study, ground conditions and their changes of flood plain of Japanese urban rivers such as the Mikasa River, the Ooita River, the Ooyodo River and the Shira River were investigated by using topographic maps, aerial photographs and satellite data in GIS. The ground conditions at the area where the natural disaster occurred in the past were considered. As a result, in the analysis using such geographic information for the flood plain, it was clarified that we can evaluate the natural disaster at the urban area qualitatively and quantitatively from the characteristics on the distribution and its change of the ground condition in the riverside area. We confirmed that the GIS analysis process is applicable to not only flood plain but also coastal plain and foreign flood plain.