流木に関する実験的研究

Abstract

A large number of growing trees, cutted trees and members ofwooden structures are washed away by a flood. Some of these washed timbersare caught by the bridge piers and give rise to break the bridges and banks. Inorder that the basic consideration how the washed timbers are smoothly carriedaway through the span of the bridge piers may be had, some experiments with useof the uniform size model timbers are made. Although the experiments have notbeen finished yet, the authors obtained some representative expressions about thecritical conditions that all of the washed timbers are entirely caught by the bridgepiers, and about the dam-up water stage due to the accumulated timbers.