短间距双戗堤截流试验研究

Research on River Closure with Two Banks for Short Spacing

双戗堤立堵截流工程中,龙口的各项水力学参数决定了截流进占的难度。其不仅与截流河段的地形、来流量以及导流建筑物的泄流能力有关,还和上下戗堤以及龙口的相对位置有关。在分析上述条件的基础上结合试验研究,针对两戗间距不能满足水流横向扩散消能的工程特性,提出利用工程措施改变下龙口流场分布的方法来降低截流难度。

Both the flow velocity and the unit stream energy are the indexes to evaluate the degree of difficulty for the fiver closure. They are not only controlled by river topography and discharge and the discharge capaeity of diversion structures, but also controlled by the address of two banks and two end-tipped. Based on the basic theory and model test of the fiver closure by two banks, when the space is not enough to dissipating the energy of the flow ,the thesis brought forward a new way to reduce the difficulty of fiver closure with two banks ,which changing the distributing of the flow velocity before the end-tipped.