天然复式河道的流量计算  

Computation of Discharge in Natural River with Compound Cross-section

作　　者：朱新元[1] 许唯临[1] 张永丽[1] 

机构地区：[1]四川大学高速水力学国家重点实验室,四川成都610065

出　　处：《四川大学学报（工程科学版）》2004年第2期33-35,共3页Journal of Sichuan University (Engineering Science Edition)

摘　　要：漫滩水流在天然河道中极为常见 ,尤其在冲积平原地区。漫滩水流的水位流量关系将和一般的明渠流有所不同 ,使过水能力的估算较一般的明渠流困难。采用以水深平均的Navier stokes方程为基础的漫滩水流计算方法 ,通过对动量交换法和摩阻因子的研究 ,针对某天然复式河道的具体条件 ,在考虑床面粗糙度的条件下 ,计算出漫滩洪水垂线平均流速横向分布 ,进而计算出断面过流流量 ,并得到水深与流量的关系。Overbank flows can occur in many natural rivers, especially those in alluvial plains. The relationship between water-depth and discharge of overbank flows is very different from inbank flow. So it is harder to compute discharge of overbank than discharge of inbank. The momentum exchange method of overbank flow and the friction factor were studied on the basis of the depth-averaged Navier-stokes equation. Through the analysis on river bed roughness, the lateral distribution of depth-averaged velocity and the discharge in a natural river with compound cross-section were calculated. The relationship between water-depth and discharge was obtained.

关 键 词：复式河床 漫滩水流 流量 流速 

分 类 号：TV133.1[水利工程—水力学及河流动力学]