颗粒比重对水流挟沙力的影响

The Influence of Specific Weight of Grains on Sediment Transport Capacity

根据颗粒在水中跃移运动的理论分析及水槽试验资料,推移质颗粒的跃移高度,步长及速度与颗粒比重均非定比关系.随着水流强度的增加及颗粒比重的减小,颗粒比重变化对推移质运动参数及推移质和全沙挟沙力的影响愈来愈小.这一问题的认识对利用轻质砂进行动床模型试验时的相似律问题以及输送不同比重矿物的管道两相流输沙率等问题都有重要的影响.

According to the theoretical analyses and the observations in flume on the saltation of grains in water flow, it is found that the specific wei-,ght of grain plays an important role to the factors affecting the height, length and velocity of the grain saltation and the sediment transport capacity of the flow. The saltation parameters increase with the decrease of specific weight of grain but the influence of specific weight will gradually reduce when the relative flow intensity becomes high. The influence of grain specific weight on sediment movement might be very important on the design of hydraulic model if light material is used as model sand.