流出量時系列の季節的特性について

Abstract

This study aims at probabilistic and stochastic seasonal characteristics of time seriesof runoff in order to obtain useful statistical inforinations. The outlines of the resultsobtained are as follows:(1) The periodicity of a year of time series of runoff can he found out remarkably bytaking a suitable unit duration for sampling.(2) By analyzing the, it is to say, moving stochastic parameters of such a duration withrespect to the time series of daily ruoff, it is found that there are seasons and districtsin which the auto-regressive process is to be considered or is not.(3) Practically, the seasonal division of the time series of runoff in a year is possibleby the time-point in which the time series obtained by moving average of a year crossesthat of the above duration.