SEASONAL CHARACTERISTICS OF TIME SERIES OF RUNOFF AMOUNT

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.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