Integrated Run-off and Mean Air-temperature during Winter

Abstract

Correlations between integrated run-off (in terms of hydro-electric potential out-put KWh) and mean air-temperature during winter extending over the period of fifteen years are discussed for two districts in Japan. Integrated run-off during winter runs closely parallel to the mean air-temperature year by year in the Tohoku district (γ=+0.83, see Figs. 1 and 2) whose mean air-temperature in winter is nearly 0°C (i.e. melting point): while no marked correlation between integrated run-off and mean air-temperature during winter exists in Hokkaido, whose mean air-temperature in winter is quite low as -6°-7°C. Data for hydro-electric potential out-put shown in Tables 1 and 2 are taken from a source book published by the Ministry of International Trade and Industry, Japan.