非淹没丁坝局部冲刷深度计算的探讨

An Approach to the Depth of Local Scour of Non-submerged Spur Dike

分析了非淹没条件下丁坝冲刷坑形成机理及主要影响因素,提出了丁坝上游挤压流动的物理图式和坝轴断面流速分布规律,由此建立了局部冲刷深度公式。

The formation mechanism of the scour pit of spur dike under the condition of non-submersion and main influential factors are analyzed, the physical diagram of squeezed flow upstream the spur dike and law of dikeaxial cross-sectional velocity distribution are set forth, based on which, the formula for the depth of local scour is established.