流域の地形・地質と流量逓減曲線

Abstract

Master recession curves of runoff were composed for 7 basins from long term discharge data which had been examined on their reliability. The coincidence of master recession curves for different terms and the close relativity between ground water level and low water-discharge suggest that the master recessoin curve would be proper for each basin. The attenuation constant of a master recession curve between low water-discharge and draughty water-discharge was compared with a simple index made from geographic gradient and geologic matrix of each basin. The two values seem to have correlation, provided that the river density is taken into account. It strongly suggests that the quantative relationship between master recession curve and geography and geology of the basin would possibly be existent.