地点毎時記録から認識される降水・無降水時間の連の確率過程的特性

Abstract

An investigation of stochastic or statistical properties of precipitation events would be impor-tant in the meaning that they could be scientific criterion in water planning or management.This study is a part of such an investigation, and takes up a problem about runs of wet anddry hour recognized on hourly precipitation records, which were obtained for several decades at thetwo points in the Kinki District.Empirical distributions of lengths of those runs are shown, dividing into two seasons, I.e., flood season (June～Oct.) and non-flood one (Nov.～May) to see the difference. Applying theconcept of failure rate in the field of 'reliability' to the distributions, stochastic properties andtransition probabilities of those runs are examined.Most interesting result is that both failure processes of wet hour run and of dry one are quali-tatively like to typical one of life-time of manhood or machine, independently of observation pointand season mentioned above.