古田双口渡水电站整体水工模型试验研究

The test study of holistic hydraulic model of Gutian Shuangkoudu water power station

由于双口渡水电站的溢流坝泄洪单宽流量大及下游河床狭窄且地质条件较差,原初步设计中担心其 溢流大单宽泄洪对水舌挑距及两岸稳定性的不利影响,挑射水舌受径向集中的强烈影响会对下游河床产生 的严重冲刷等问题．为此本水工试验除了验证泄流能力、水面线及流速分布等常规试验内容外．着重研究 分析溢流拱坝大单宽泄洪对水舌挑距及两岸的不利影响程度,同时重点研究挑射水舌受径向集中的强烈影 响对下游河床产生的严重冲刷问题,并采取一定的工程措施,最大限度地减轻下游河床冲刷,确保拱坝安 全泄洪．

For the shuangkoudu water power station, flood discharge per unit width of overfall dan is higher and lower bed river is narrow and geological conditions are bad. In the original design, the influence of the higher flood discharge per unit width of overfall dam on the flip length of nappe and stahility of two bank and the seriously washout lower bed river which was caused by the strong influence of radial concentration on the jet nappe were cared. In the hydraulic experiment, besides the routine test such as validating the discharge ability and water surface curve and distribute of flow rate, the emphasis work were the analysis of influence of the higher flood discharge per unit width of overfall dam on the flip length of nappe and on the stability of two bank and the study of the seriously washout lower bed iver which was caused by the strong influence of radial concentration on the jet nappe. And some engineering measure was introduced to farthest mitigate the washout problem of lower bed river and to ensure the flood discharge of the arch dam safety.