宽级配床沙起动规律的实验研究

Study on Incipient Motion of Bed Material with a Wide Size Distribution

本文在水槽实验的基础上,根据最小能量耗散原理,考虑诸如水流脉动、床沙组成、河床糙率、粗细颗粒间相互作用、河床粗化程度等因素的影响,建立了宽级配床沙起动的三种模式以及相应的非均匀沙起动流速公式,经实验资料检验,符合较好。

Based on the flume experiments, the principle of minimum energy consumption, the consideration of the effects of factors such as the fluctuation of flow, the composition of bed material ,the roughness on river bed,the interaction between coarse particles and fine ones and the extent of armoring of the river bed, three patterns of incipient motion of bed material with a wide size distribution and corresponding formulas for their incipient velocities have been established The results calculated from these formulas agree well with the experiment data