山地流域における侵食と流路変動に関する研究 (1)-粘着性材料を含む砂礫の移動限界と流砂量-

Abstract

Erodibility and transport characteristics of soil mixtures composed of coarse uniform sand andclay are discussed theoretically and experimentally.A formula, which is a function of the cohesive strength, clay composition rate and water content, is presented, concerning the nondimensional critical shear stress of sand particle within the soil mix-tures. Then, the non-equilibrium sediment transport caused by the difference of critical shear stressbetween detached and undetached sand particles is discussed, and the distribution function of thetransport rate is formulated. Some experiments as to the critical shear stress and the transport rateof sediment are carried out in order to examine the applicability of these formulas.