非恒定流作用下丁坝局部冲刷研究

丁坝水毁受多种因素的影响，通过水槽概化模型试验，在天然河流日均流量过程作用下，分别对比了相同重现期时年最大洪峰流量和有效洪水周期遭遇、年最大洪峰流量和半月最大洪水总量遭遇丁坝局部冲刷的程度，指出洪峰流量对冲刷深度起主导作用，洪水总量对坝头冲刷坑范围起主导作用，有效洪水周期对冲刷坑范围及冲刷深度均起其主导作用，并对非恒定流作用下坝头冲刷坑的发展过程进行了分析。

Local Scour of Spur Dike in Unsteady Flow

Water damage of spur dike influenced by many factors, through flume model experiment, under the action of the average daily flow process of natural river, degree of local scour of spur dike are compared respectively with the same return period when maximum flow and flood period as a total annual maximum flood peak discharge and half maximum flood. It points out that the peak flow plays a leading role in scour depth, the flood volume plays a leading role in scour scope, effective flood period on the scope and scour depth of the pit are its leading role, and the scour pit are analyzed in unsteady flow .