台阶式消能设计中相关参数的敏感性分析

Sensitivity analysis of related parameters in stepped energy dissipation design

台阶式坝面的消能率超过光滑坝面,但台阶式消能设计受许多参数影响。为充分利用溢流面消能,本文利用昌桑算法计算不同边界条件下的台阶式坝面的消能率。通过敏感性分析,对台阶尺寸、溢流面坡度、单宽下池流量和溢流面净高等不确定性因素进行比较。结果表明,单宽下泄流量和溢流面净高是较为敏感的因素。在设计方案中,应更加重视单宽下泄流量和溢流面净高对溢流面消能效果的影响。

The energy dissipation ratio of the stepped dam face is higher than that of the smooth dam face.However,the design of energy dissipation of stepped spillway is affected by many parameters.In order to make full use of the energy dissipation of overflow surface,the H.Chanson formula is used to calculate the energy dissipation ratio of stepped dam face under different boundary conditions.Through sensitivity analysis,the uncertain factors such as step size,overflow surface slope,single width flow ratio and overflow surface clear height are compared.The results show that single width discharge ratio and clear height of overflow surface are more sensitive factors.In the design scheme,more attention should be paid to the influence of single width discharge rate and clear height of overflow surface on the energy dissipation effect of overflow surface.