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采用水槽试验,通过观测分析不同围堰束窄度下其进口断面垂线流速分布和水深变化,对围堰遮掩部分的水体在过水断面上的流量分配进行研究,给出了围堰进口断面的阻水流量与束窄度之间的关系以及在断面上的分配规律.研究表明:围堰进口断面的阻水流量随束窄度增加而增加,两者成正比关系;阻水流量由围堰转角向对岸递增分配,有围堰岸各流带的分配率β变化范围为3.2%~16.4%,无围堰岸β变化范围为20.7%~41.2%.所得结论可为在通航河流上进行分期导流不过水围堰方案布置提供理论依据.
The experiment of sinking was used to study the distribution of water flow in the covered part of cofferdam and the cross section of inlet section of cofferdam by observing and analyzing the vertical velocity distribution and water depth change of inlet section under different width of cofferdam bundle. The relationship between the flow and the beam narrowness and the distribution rule in the cross section are studied.The results show that the water blocking flow at the inlet cross section of the cofferdam increases with the increase of the beam width, The weir turns distributed to the opposite bank in an incremental manner, with the change rate of distribution rate β ranging from 3.2% to 16.4% for all flow strata with cofferdam banks and ranged from 20.7% to 41.2% for the bankless cofferdam. The conclusions can be made on navigable rivers Staged diversion However, the cofferdam program layout provides a theoretical basis.