无坝渠首改建成有坝渠首后,抬高了上游水位,改变了原河道的水流及输沙条件。由于对无坝取水改建成有坝取水的变化情况认识不充分,致使改建工程运行一段时间后达不到原设计要求,有些还造成意想不到的后果。本文根据实际运用情况和模型试验研究,提出了将无坝渠首改建为有坝渠首时,应考虑的坝区河势规划、建筑物的尺寸及布置、运行管理等几个问题。 No dam canal was first converted into a dam canal head, raising the water level upstream, changing the original river water and sediment transport conditions. Due to inadequate understanding of the changes of non-dam water intake into dam water intake, the original design requirements could not be achieved after some operation of the reconstruction project and some unexpected consequences were caused. Based on the actual situation and the model test, this paper puts forward some problems that should be considered when planning the reconstruction of a dam without a dam into a dam canal, such as planning of river regime in dam area, size and arrangement of buildings, operation management and so on.