Abstract
The characteristics of concurrence of rainfall and storm surge at Osaka are made clear by analyzing the available data of typhoons for the period 1900-1980; Distributions of typhoon positions when maximum storm surge ηmax or peak rainfall intensity γp occurred, a histogram of time-lag between ηmax and γp, and relationships between ηmax and γp, and between ηmax and total rainfall RT, are shown. Predictors of rainfall and storm surge are selected by using the stepwise regression analysis, and the probability distributions of the residuals are revealed. It is probable that the flood wave following the rainfall moves downstream in a river and the storm surge invades the river, with a considerably short time-lag. On these occasions, the high water levels along the river change, depending on the length of the time-lag. Such features of high water levels are examined in terms of the behavior of storm surge propagation in the lower reach with mild slope.
