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建立曲线坐标系下的三维水流泥沙湍流运动模型模拟弯曲渠道内布置水生植被后的水流结构和河床变形分布,计算了试验室60o弯道内流经植被的水流流速平面结构和断面分布以及不同植被布置情况对水流泥沙运动和床面变形的影响。数值结果较好地再现了试验规律。计算结果表明在弯道内布置植被会改变水流流速分布情况:植被覆盖区域的水流流速降低、弯道内二次流减弱和泥沙运动减弱,而非植被覆盖区域的水流流速增大、断面二次流依然存在且泥沙运动加剧。通过比较两种水生植被布置条件下的床面变形情况,发现合理布置植被可以减缓凹岸的泥沙侵蚀,但也会加剧凸岸的泥沙淤积。
The three-dimensional turbulent model of turbulent flow in curvilinear coordinate system was established to simulate the flow structure and distribution of riverbed after the aquatic vegetation was arranged in the curved canal. The plane flow structure and cross section distribution of the flow in the 60o curve in the laboratory were calculated, Influence of Layout on Flow and Sediment Movement and Bed Distortion. Numerical results reproduce the experimental law better. The results show that the vegetation distribution in the bend changes the distribution of water flow velocity: the flow velocity in the vegetation cover decreases, the secondary flow weakens and the sediment movement weakens in the curve, while the flow velocity in the non-vegetation area increases, Still exist and the sand movement aggravates. By comparing the deformation of the bed under two aquatic vegetation layouts, it is found that the rational arrangement of vegetation can reduce the sediment erosion of the concave bank, but also aggravate the sedimentation of the bank.