彎曲水路の河床変動に関する研究(2)

Abstract

In the previous paper'~, we discussed the process and mechanism of the progressionof the local scour in the alluvial curved channels on the basis of the experimental studies, and developed the theoretical analysis for the variation of lateral bed profiles at the initialstage of scour.This paper proposes an analytical approach for the progressive stage of scour, whichdescribes the longitudinal variation of bed profile with time along the outside wall ofcurved reach. The fundamental equations derived in this analysis include two unknownfactors. The one is characteristics of flow pattern near the scour hole, and the other isthe variation of stream width near the outside wall or longitudinal profiles of lateralscour front with time. Concerning to these problems, we discuss the results of themeasurements of flow direction and velocity near the bed and the observation of Dunes(Bars) in the curved reach.