整治建筑物周边局部冲刷深度计算

Calculation of local scour depth around regulation structure

针对现有局部冲刷深度经验公式多、适用范围小、计算结果与实际出入较大的问题,从冲刷机理上推导出通用的局部冲刷公式,并根据实际情况进行修正和确定相关参数。结果表明,整治建筑物周边局部冲刷深度主要与工前水深、工程前后流速变幅、水流紊动强度、流量调整情况等有关;冲刷公式中参数k、λ、n的取值对计算结果影响较大;修正后的公式与规范相比具有一定优势。

There are many empirical formulas of local scour depth around regulation structure at present,but the scope of application is small,and the calculating result is out of line with the actual situation.To solve the problem,this paper deduces the general scour depth formula from mechanism,corrects the formula and determines the relevant parameters according to the actual situation.The results show that local scour depth around regulation structure is related to water depth before project,the velocity amplitude before and after engineering,turbulence intensity of flow and the adjustment of flow,etc.The parameters of[WTB1X]k,λ[WTBZ]and[WTB1X]n[WTBZ]in the scour formula have a great influence on the calculation result.The correction formula has some advantages over the standard formula.