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工程应用中的丁坝往往具有一定的端坡,而且经常处于淹没状态。为了研究端坡对淹没状态下丁坝附近水流结构的调整作用,采用水槽试验和三维浅水模型相结合的方法,分析淹没时丁坝阻水面积相等条件下坝头直立和具有一定端坡时丁坝附近的表层平面流场、底层平面流速分布和底层切应力分布情况。结果表明:淹没程度?H/H?0.17时,丁坝下游仍出现回流区,端坡系数m等于1时相对回流长度和坝头附近流向偏角最大;存在一定端坡时,坝头附近临近底床平面强流速范围和底床切应力范围显著减小或消失,m等于7时能够将丁坝附近流场调整得较为均匀。
In engineering applications, the dike often has a certain slope, and often in submerged state. In order to study the adjustment effect of the end slope on the flow structure near the dams under submerged conditions, the method of combining the sink test with the three-dimensional shallow water model was used to analyze the influence of the dikes on the dikes, The surface flat flow field, the bottom plane flow velocity distribution and the bottom shear stress distribution. The results show that when the submergence is in the range of H / H = 0.17, the recirculation zone still appears downstream of the dam, and the relative backflow length and the maximum flow declination near the head are the best when the slope m is equal to 1; Bed velocity range and bed shear stress range significantly reduced or disappeared, m is equal to 7:00 to be able to adjust the flow field near the dams more evenly.