宽浅导流明渠渠首进口型式试验

Test on intake form of wide-shallow diversion channel

以新集水电站施工导流工程为对象,通过物模试验研究了宽浅导流明渠渠首位置的进口型式对明渠泄流能力及明渠内部水流特性的影响.试验结果表明,在不增加(如加筑顺坝)或不改变(如偏转上游纵向围堰)导流建筑物的前提下,明渠渠首底部的河床形状是影响明渠泄流和渠内水流特性的主要因素.试验中提出了两种不同的渠首河床开挖方案,通过对比明渠泄流能力和水流流态、流速、水面线等水力参数,确定选用局部疏挖加深槽的开挖方案,获得了较好的效果.对相似工程具有一定参考价值.

Through physical model test,the construction diversion works of Xinji hydropower station is aimed to study the impact on the discharge capacity and flow characteristics of the open channel,which mainly caused by the intake form of wide-shallow diversion channel.The research results indicate that,subject to the condition of no addition,as well as no change of diversion works,the shape of river bottom is the major factor affecting the discharge capacity and flow characteristics.Two different excavation programs are proposed,with the comparison of various hydraulic parameters,such as discharge capacity,fluid state,velocity and water surface curve;the layout scheme of part dredging and deepening trough is selected,which can meet the requirements.The study results have the referential value for the similar projects.