带有胸墙的大孔口溢流坝在大中型水电工程中已被广泛采用,如我国的丰满、柘溪、黄龙滩等均是。关于坝上孔流的水力特性,国内外有不少人进行过试验研究和理论分析。对孔口出流的流量计算,由能量方程导出,其表达式为Q_0=μ_0ab 2gH_0~(1/2),式中孔流系数μ_0与 Large orifice overflow dam with chest wall in large and medium-sized hydropower projects has been widely used, such as China’s plump, Su River, Huanglong Beach so are. On the hydraulic characteristics of the flow on the dam, many people at home and abroad have conducted experimental studies and theoretical analysis. The outlet flow of the orifice is calculated from the energy equation, and its expression is Q_0 = μ_0ab 2gH_0 ~ (1/2), where the flow coefficient μ_0 and