洪水流出計算の総合化に関する一考察

Abstract

We have been studying the formation process of a hydrograph of storm runoff, using a set ofunit basins and the stream net which connects these unit basins. In the first part of this paper, we describe the roles of the unit basins and the stream net in the runoff process and the propagationof errors included in a calculated common hydrograph from unit basins. The result is that theerrors included in a common hydrograph from unit basins are attenuated through the stream net, and the relative error of peak discharge at the basin outlet becomes 6O-9O% of that of the commonhydrograph. In the second part, we describe synthetic flood hydrograph from a unit basin. TheTank model is used for the convenience of calculation, in which the first tank seems to simulatethe occurrence stratumn of surface flow, the second tank of prompt interflow and the third tank ofdelayed interflow. From the examination of 5 river basins, we obtained that the value of corre-sponding parameter for each basin, except L1, L2, L3, F2 shown in Fig. 6, becomes same.