大圆弧导向鼻坎在昌马水库溢洪道改建中的应用

在昌马水库多年的泄洪运行中发现,其溢洪道泄洪出口水舌落点集中,在岸边形成较深的冲刷坑,直接威胁到岸坡的稳定安全。为了解决该问题,通过溢洪道挑流鼻坎改建方案的水工模型试验研究,调整挑流鼻坎体形,提出了适用范围较广的大圆弧导向鼻坎改建方案。经过模型试验验证,大圆弧导向鼻坎不仅具有很好的导向功能,有效控制水舌落水位置、分布及范围,而且能使水舌沿横向、纵向拉开,使水舌覆盖消能区较大范围,减轻河床冲刷,有效解决昌马水库溢洪道存在的问题。

Application of Large Arc Oriented Bucket on the Reconstruction of Spillway in Changma Reservoir

In many years of Changma Reservoir spillway operation,finding the left of the spillway nappe sweeping the slope,and the placement of water concentrated,forming deep scour hole in the shore,threatening the safety of bank slope stability.In order to resolve the problem,based on the tests and research on the reconstruction of flip bucket for the spillway of Changma hydropower project in Gansu,and through modification of the flip bucket shape,a new flip bucket,large arc oriented bucket widely suitable was proposed.With model test verification,this bucket effectively solve the problem of Changma Reservoir spillway.The nappe of this type of bucket can not only with a good guiding function,effectively control the filling location,range and distribution of nappe,but also extend along longitudinal direction and horizontal direction,and cover a large range of energy dissipation zone which can reduce riverbed scouring.