【摘要】 对3种斜坡(5.7°,19°和30°)的台阶式溢洪道进行了模型试验研究。结果表明,当堰上相对临界水深yc/h≤2.5时,滑行水流、过渡水流和跌落水流消能率的大小不受堰上相对临界水深的限制,而只是相对坝高Hdam/yc和斜坡角度的函数,即随坡度变缓或相对坝高Hdam/yc增加,消能率增大;当坝坡相同坝高相等时,滑行水流、过渡水流和跌落水流之间的消能率差异很小,并且其消能率大小与台阶个数无关;此外,文中还给出了计算消能率的经验公式。更多还原

【Abstract】 The model experiment on stepped spillway with three different slopes （5.7°,19° and 30°） shows that energy dissipation ratio under skimming flow,transition flow or nappe flow,would not be confined by the relative critical water depth on weir （y_c/h≤2.5）,and it is only the function of relative dam height (H_dam/y_c) and angle of slope.Energy dissipation ratio increases while slope grading down or H_dam/y_c rising.When H_dam/y_c is certain,the difference of energy dissipation ratio under skimming flow,transition flow and nappe flow is insignificant and the number of steps does not affect the energy dissipation ratio;In addition,this paper offers the experiental formula to calculate the energy dissipation ratio.更多还原