土石流の調節制御に関する研究 -立体格子型砂防堰堤の水理機能-

Abstract

So-called open dams such as grid or slit type pass the sediment transported during normalfloods and store the materials due to debris flows which have big destructive forces. Moreover, there may be a possibility that the deposit is eroded gradually with flood and the storage capacityis restored. Therefore, the storage capacity can be effectively used for debris flow control.This paper examins the hydraulic function of grid type dam by experiments, and clarifies thatthe following conditions should be fulfilled for the effective uses, l/dmax=l.5～2l/db>2where, l is the span of grid mesh and dmax, db are respectively the maximum diameters of debrisflow material and of bed load sediment.