枠型透過水制の水理機能について

Abstract

This paper deals with experimental investigations of the hydraulic performance ofgroynes of lattice-type settled in open channel flows. Experiments were made in laboratoryflumes, under two flow conditions of fixed and movable beds.Experimental results obtained are summarized as follows : 1) the direction of flow iscontrolled by groynes in such a way that the approaching flow is partly concentrated in thecentral core of flow from the upstream side of groyne, which is examined by observing theflow pattern on the free surface through the flow visualization technique used with saw-dust tracer, 2) the velocity measurement using a hot-film flowineter of constant-temperatureoperation shows that the longitudinal component of mean or turbulent velocities changesextremely near the groyne, 3) it should be noticed that extensive movements of the groyne, which settled over the movable bed, will probably occur due to sand transportations.