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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.
Taking the Diversion Project of Xinji Hydropower Station as an example, the influence of the inlet type of the open channel with wide and shallow diversion channel on the discharge capacity of open channel and the internal flow characteristics of the open channel was studied through the model test.The results show that without increasing Under the premise of diversion of buildings without changing (eg, deflection of the upstream longitudinal cofferdam), the shape of the riverbed at the bottom of the open channel ditches is the major factor that affects the discharge of the open channel and the water flow characteristics in the ditch. In the experiment, two Different kinds of canal dredging schemes of canal head can be obtained by comparing the discharge capacity of the open channel with hydraulic parameters such as flow pattern, flow velocity and surface water line, so that the excavation scheme with partial dredging and deepening groove is selected and good results are obtained. The project has a certain reference value.