時系列分析を用いた河川流量変動の典型性抽出手法に関する研究

抄録

This study attempted to extract typicality of water level fluctuation by using time series analysis of water level data from 1975 to 2006. Universality of the typicality was examined by comparing to water levels in 1890s. The results showed that time series analysis was able to extract the typicality. Particularly, flooded periods and seasonal variation of flow rate were well extracted and the typicality was very similar to in 1890s. However, we were not able to find similar patterns in the scale of floods between two periods because the flooded scale depended on stochastic variation.