【摘要】 山区闸坝由于河道比降大,汛期泥沙含量高,设计一般采用护坦形式与下游河道衔接。依托某水电站的物理模型试验,对比研究了闸后反弧护坦和直线斜坡护坦两种衔接形式。从水流流态、流场分布和下游河床冲刷等方面进行对比,结果表明,反弧护坦在水流流态和下游冲刷方面明显优于直线斜坡护坦,具体为消除护坦左侧回流,最大冲刷深度减少38%;但在下游低水位时两岸的岸边流速较直线斜坡护坦大,其中右岸岸边流速平均增加12.5%。综合考虑,若两岸山体较为完整,采用反弧护坦可取得较好的工程效果。更多还原

【Abstract】 Due to the large specific drop of river and high sediment content in flood season, the design of sluice in mountainous area usually adopts apron energy dissipator to connect with the downstream river. Based on the physical model test of a hydropower station, this paper makes a comparative study of the two connecting forms of the anti-arc apron and the straight slope apron. By comparing the flow pattern, flow field distribution and downstream riverbed scour, the results show that the anti-arc apron is obviously superior to the straight slope apron in terms of flow pattern and downstream riverbed scour. Specifically to eliminate the left-side reflow of the apron. The maximum scouring depth is reduced by 38%. However, at the downstream low water level, the shore flow velocity of the two banks is larger than that of the straight slope apron, with the average increase of 12.5% on the right bank. Considering comprehensively, if the mountains on both sides are relatively complete, better engineering results can be obtained by adopting anti-arc apron.更多还原