River bank erosion can upset the balance of the river and its aquatic habitat, as well as the lands and facilities adjacent to the river. As hydraulic structures, spur dikes are constructed perpendicularly to erodible river banks in an attempt to divert the flow toward the middle of the channel as a measure for reducing and controlling river bank erosion. The expansion of the scour hole at the tip of the spur dike can lead to structure failure. Inclining the horizontal crest of the rectangular spur dikes (called triangular-shaped spur dike) can reduce the scouring at their tips. There are limitations on the design criteria for this newly-introduced structure. In the present study, the scour patterns developed around triangular spur dikes were examined under different hydraulic conditions and compared these patterns with those obtained for common type of spur dikes (rectangular spur dikes). The three-dimensional velocity components around triangular and rectangular spur dikes were also measured. According to the results, maximum scour hole depth and volume were smaller in the triangular spur dikes than in their rectangular counterparts. Quantitatively, on average, maximum scour hole depth and volume in the former were, respectively, 44% and 70% less than those in the latter. Based on the analyzed the flow patterns, it is recommended that the spacing between the triangular spur dikes should not exceed 5.5 times the effective length of the structure.

河岸侵蚀会破坏河流及其水生生境以及与河流相邻的土地和设施的平衡。作为水工建筑物，丁坝沿垂直于易蚀河岸的方向建造，试图将水流引向河道中部，以减少和控制河岸侵蚀。丁坝末端的冲刷孔扩大会导致结构故障。使矩形丁坝（称为三角丁坝）的水平波峰倾斜可以减少其顶端的擦伤。这种新引入的结构在设计标准上有局限性。在目前的研究中，在不同的水力条件下检查了三角丁坝周围的冲刷模式，并将这些模式与常见类型的丁坝（矩形丁坝）的冲刷模式进行了比较。还测量了三角形和矩形丁坝周围的三维速度分量。根据结果​​，三角形丁坝的最大冲刷孔深度和体积要比矩形丁坝小。从数量上看，前者的最大冲孔深度和容积平均分别比后者少44％和70％。根据分析的流动模式，建议三角形丁坝之间的间距不应超过结构有效长度的5.5倍。还测量了三角形和矩形丁坝周围的三维速度分量。根据结果​​，三角形丁坝的最大冲刷孔深度和体积要比矩形丁坝小。从数量上看，前者的最大冲孔深度和容积平均分别比后者少44％和70％。根据分析的流动模式，建议三角形丁坝之间的间距不应超过结构有效长度的5.5倍。还测量了三角形和矩形丁坝周围的三维速度分量。根据结果​​，三角形丁坝的最大冲刷孔深度和体积要比矩形丁坝小。从数量上看，前者的最大冲孔深度和容积平均分别比后者少44％和70％。根据分析的流动模式，建议三角形丁坝之间的间距不应超过结构有效长度的5.5倍。前者的最大冲孔深度和容积分别比后者小44％和70％。根据分析的流动模式，建议三角形丁坝之间的间距不应超过结构有效长度的5.5倍。前者的最大冲孔深度和容积分别比后者小44％和70％。根据分析的流动模式，建议三角形丁坝之间的间距不应超过结构有效长度的5.5倍。