ウォシュ・ロードに関する研究 ―大戸川の観測結果について―

Abstract

In order to elucidate the applicability of the hydraulic analysis on the transport processof wash load developed in the previous paper'), we set out the observations of suspendedsediment concentration and water stage of a flood in June 1974 at 13 stations in the drainagebasin of the river Daido.The resuls of the observation support the predicted results of the simultaneity betweenmaximum concentration of wash load and peak flow stage in the each station along themain stream and the analytical relations between the concentration of wash load and theflow discharge during the recession stage of the flood in the station of the sub-basin withthe lower percentage of bare soil land. During the rising stage of the flood, however, theconcentrations of wash load observert are higher than the analytical ones, and the furtherstudies on the sub-surface runoff in the sub-basin with various percentage of bare soilland will be needed.