FUNDAMENTAL STUDY ON CRITICAL TRACTIVE FORCE OF SUBMERGED WOOD

Abstract

 It is reported that submerged woods in a dam lake induce gate blockage accidents. Hence the present study focuses on quantitative evaluation of critical tractive force. We measured the critical tractive force of the submerged wood in the laboratory flume varying systematically the size, density and initial yaw angle of the wood model. Also, performing movable bed experiments, an influence of initial burial depth was examined. It results in that the normalized critical tractive force could be expressed by universal formulae using Reynolds number and a correction function. Further, considering a stopping condition of the submerged wood moving downstream, we explained the distribution property of the submerged woods observed in the dam reservoir.