长江上游铜锣峡河段卵砾石推移质输沙规律研究  

The Study on Gravel Bedload Sediment Transport Law of the Tongluo Xia Section in Upper Yangtze River

作　　者：闫俊平 

机构地区：[1]长春市新立城水库管理局,吉林长春130119

出　　处：《甘肃科学学报》2017年第4期97-100,共4页Journal of Gansu Sciences

摘　　要：西部山区河段具有水面比降大、河床推移质粒径粗、糙率较大等特点,因此西部山区河段的水沙特性与平原河流差异明显,采用现有的推移质输沙公式来预测山区河段的泥沙输移情况存在较大误差。针对这一现象,基于爱因斯坦均匀沙无量纲输沙公式,考虑到推移质周围床沙对其遮蔽影响,以V/Uc=1为推移质起动临界状态建立了输沙率计算公式,最后以长江上游铜锣峡河段为研究对象,根据近二十年实测的水沙数据,将新计算式与多个经典公式进行精度比较,从计算结果来看,在预测大比降卵砾石山区河流时,新建立的计算式计算精度更高,能更好的反映其输沙规律。The mountain stream has a large water surface slope,river bed load characteristics of coarse particle size, the roughness is bigger, so the mountain stream sediment characteristics and plain river clear difference, uses the existing formula for bedload sediment transport can be used to predict the sediment transport conditions of the mountainous river there is a big error.In reaction to the phenomenon,this article is based on Einstein＇s uniform sediment dimensionless formula,considering the bedload sediment around in- fluence on its cover, for starting critical state for bedload sediment transport rate formula is established, and finally to the upper Yangtze river causeway gorge river as the research object, according to the observed data of the water and sediment from nearly 20 years,in this paper,the calculating formula and sev eral classic formula are compared,and the accuracy of the calculation results,in the prediction of the gravel in mountainous rivers with large gradient, this paper established the calculation formula of calculation accuracy is higher, can better reflect the law of sediment.

关 键 词：输沙规律 临界起动 中值粒径 遮蔽系数 水力因子 

分 类 号：TV143[水利工程—水力学及河流动力学]