澜沧江丁坝坝头冲深的试验研究*

以澜沧江曼厅段的河道特性为典型,建立了山区河道丁坝坝头冲刷坑深度的概化模型试验。在进行长历时丁坝清水平衡冲刷试验的基础上,分析了坝头冲深的影响因素;通过量纲分析和多元回归的方法,建立了以流速v为主要参数的冲深计算公式,并与各家公式进行比较,表明该公式较为合理。采用天然河道丁坝冲深资料对公式进行了验证,计算值与实测值基本符合。研究为确定山区河道丁坝基础埋深提供了参考,也为将来治理同类型河道积累了经验。

Experimental study on scour depth of groyne head in Lancang river

Based on the stream characteristics of the Lancang river, we establish the generalized model test about the scour depth of the groyne head of the mountainous river. According to the long-duration equilibrium scour experiments, we analyze the influential factors of the scour depth around groyne heads. Based on the test data of the generalized model, we set up the calculation formula for the scour depth of a spur dike with velocity v as the main parameters, which is proved more reasonable after comparing with other formulas, and tested by scour depth material of the natural river, showing that the calculated values are in accordance with measured values. The research offers a reference for ensuring the embedded depth of spur dikes and accumulates experience for regulating others rivers of the same type.