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张婕,王平义,胡杰龙,等. 分汊河道近底水流特性试验研究[J]. 科学技术与工程, 2021, 21(8): 3297-3303.
ZHANG Jie,HU Jie-long,et al.Experimental Study on the Characteristics of Flow Near the Bottom in Bifurcated Channel[J].Science Technology and Engineering,2021,21(8):3297-3303.
分汊河道近底水流特性试验研究
Experimental Study on the Characteristics of Flow Near the Bottom in Bifurcated Channel
投稿时间:2020-05-27  修订日期:2020-09-17
DOI:
中文关键词:  分汊河道  近底流速  脉动强度  脉动能
英文关键词:bifurcated channel  flow near the bottom  fluctuation intensity  fluctuating energy  
基金项目:国家重点研发计划课题
           
作者单位
张婕 重庆交通大学 水利水运工程教育部重点实验室
王平义 重庆交通大学 水利水运工程教育部重点实验室
胡杰龙 重庆交通大学 水利水运工程教育部重点实验室
王梅力 重庆交通大学
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中文摘要:
      近底水流结构是影响泥沙起动、床面变形以及航道整治建筑物稳定性的直接因素。以长江中游武汉天兴洲段这一典型分汊河道为原型,开展物理概化模型试验,通过对比纵横向测点的流速差异,分析了分汊河道近底流速分布特性以及近底水流脉动变化规律。结果表明:河床地形对近底水流时均流速有一定的影响,分流区内时均流速沿横向分布较为均匀,而汊道段时均流速沿横向和纵向上分布均有波动,总体上河床高的地方流速大,且与测点处的水深呈负相关;脉动强度与该点处时均流速之比称为相对脉动强度,江心洲逆坡段的滩槽交界区域水流结构复杂,相对脉动强度大,在平直的滩顶段则是滩面处的相对脉动强度最大。
英文摘要:
      The structure of near bottom flow is a direct factor that affects the starting of sediment, the deformation of bed surface and the stability of waterway regulation buildings. By taking Wuhan reach which is the typical bifurcated channel of the middle reaches of Yangtze River as the prototype, a physical generalization model experiment was carried out. The flow velocity distribution near the bottom and its pulsation varying rule was studied on the basis of collected data at different locations. The results show that: the riverbed topography has a certain influence on the average velocity near the bottom, the traverse distribution of time average flow velocity in the distributary region is rather uniform. However, the distribution of the time average flow velocity in the inlet area fluctuates along the transverse and longitudinal directions. Generally, the flow velocity is higher at the place with higher riverbed and it has a negative correlation with the water depth. The ratio of the pulsation intensity to the time average velocity at this point is called the relative pulsation intensity, the pulsation intensity in beach-channel junction area of reverse slop reach is relatively large because of the complex flow structure. In the flat beach top section, the relative pulsation intensity at the beach surface is the maximum along the transverse.
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