裸地斜面における流路の形成過程に関する研究 (2)-流路の横断面形状-

Abstract

In this study, authors propose a simple model for shear stress distribution along the arbitrarychannel cross section, and derive stream transformation into rills or into an equilibrium crosssection, by tracing amplification or reduction of furrow-like unevenness on the bed, accompaniedwith erosion process.On a cohesive stream bed, transverse undulation with intervals narrower than several timesas water depth, reduces, and the one with wider intervals grows to split its water surface. If therate of erosion is proportional to the local shear velocity, the ratio of width to depth gets about4 in the equilibrium state.