中文摘要：

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卢变化范围为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。

英文摘要：

Based on change with width a special flume test on the velocity, water depth and obstructed-discharge distribution contraction by a cofferdam, the flow characters around a cofferdam are discussed; and the relationship between the obstructed discharge and coefficient of contraction is given. The results indicated that the obstructed-discharge is proportional to coefficient of contraction. The obstructed-discharge can be increased from the corner of upper-cofferdam to against bank; and the coefficient of obstructed-discharge distribution of the filament band near and remote from cofferdam is varied from 3.2% to 16.4% and from 20.7% to 41.2%, respectively. The result can be used for scheming cofferdam layout in a stage di- version of a navigable river.