Effects of surface roughness on overflow discharge of embankment weirs
溢出上的表面粗糙的效果堤堰排出作者机构：College of Agricultural Science and EngineeringHohai UniversityNanjing210098China College of Water Conservancy and Hydropower EngineeringHohai UniversityNanjing210098China Power China Huadong Engineering Corporation LimitedHangzhou311122China
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2021年第33卷第4期
页 面：773-781页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：Project supported by the National Natural Science Foundation of China (Grant Nos.51809079, 51809081) the Fundamental Research Funds for the Central Universities (Grant No.2019B18414)
主 题：Discharge embankment weir numerical simulation tailwater submergence surface roughness
摘 要：A numerical study was performed on the embankment weir overflows with various surface roughness and tailwater submergence, to better understand the effects of weir roughness on discharge performances under the free and submerged conditions. The variation of flow regime is captured, from the free overflow, submerged hydraulic jump, to surface flow with increasing tailwater depth. A roughness factor is introduced to reflect the reduction in discharge caused by weir roughness. The roughness factor decreases with the roughness height, and it also depends on the tailwater depth, highlighting various relations of the roughness factor with the roughness height between different flow regimes, which is linear for the free overflow and submerged hydraulic jump while exponential for the surface flow. Accordingly, the effects of weir roughness on overflow discharge appear nonnegligible for the significant roughness height and the surface flow regime occurring under considerable tailwater submergence. The established empirical expressions of discharge coefficient and submergence and roughness factors make it possible to predict the discharge over embankment weirs considering both tailwater submergence and surface roughness.
维普期刊数据库