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Hydrodynamics of In-Stream Leaky Barriers for Natural Flood Management
Water Resources Research ( IF 4.6 ) Pub Date : 2024-12-12 , DOI: 10.1029/2024wr038117
Fawaz Alzabari, Catherine A. M. E. Wilson, Pablo Ouro
Water Resources Research ( IF 4.6 ) Pub Date : 2024-12-12 , DOI: 10.1029/2024wr038117
Fawaz Alzabari, Catherine A. M. E. Wilson, Pablo Ouro
Leaky barriers are in-stream natural flood management solutions designed for peak flow attenuation, whose effectiveness is dependent on their design. Flow around leaky barriers (LB) composed of three cylindrical logs were investigated using large-eddy simulation. The main LB configuration considered vertically aligned logs, with other layouts inclined at 15, 30, and 45 in the upstream and downstream directions. Results reveal that the frontal projected blockage area of the LB leads to an increase in the upstream flow depth, with momentum being redirected toward the bottom gap, creating a primary wall-jet, whose peak velocity and coherence varied depending on LB design, however, attained a similar decay downstream. The porous LBs allowed for distinct internal flow paths that generated secondary jets, either diverting momentum upwards or downwards depending on the direction of the barrier inclination, impacting main flow features and turbulent characteristics. Turbulent kinetic energy and vertical Reynolds shear stress decreased when the barrier was inclined downstream. In the upstream inclination cases, these showed no significant variation, with magnitudes similar to those in the vertical configuration. Bed shear stress decreased with increasing barrier angle, reducing the risk of local scour and sediment mobilization. The vertical LB achieves the maximum backwater rise at the expense of promoting larger sediment bed mobilization. Structural loads on the logs vary with LB inclination, with drag forces decreasing as barrier angles increase. Hydrodynamic findings, evaluated through five design criteria, show that upstream-inclined designs, particularly with large barrier angles, exhibit improved relative performance compared to other designs.
中文翻译:
用于自然洪水管理的河内渗漏屏障的水动力学
渗漏屏障是专为峰值流量衰减而设计的溪流自然洪水管理解决方案,其有效性取决于其设计。使用大涡模拟研究了由三个圆柱形测井组成的泄漏屏障 (LB) 周围的流动。主要的 LB 配置考虑了垂直对齐的日志,其他布局在上游和下游方向上倾斜为 15 、 30 和 45 。结果显示,LB 的正面投影堵塞面积导致上游流深增加,动量被重定向到底部间隙,形成初级壁射流,其峰值速度和相干性因 LB 设计而异,然而,在下游实现了类似的衰减。多孔 LB 允许不同的内部流路产生二次射流,根据屏障倾斜的方向向上或向下转移动量,从而影响主流特性和湍流特性。当屏障向下游倾斜时,湍流动能和垂直雷诺剪切应力减小。在上游倾角情况下,这些没有显示出显着的变化,其幅度与垂直配置中的相似。床层剪切应力随着屏障角的增加而降低,从而降低了局部冲刷和沉积物动员的风险。垂直 LB 以促进更大的沉积物床动员为代价实现了最大的回水上升。原木上的结构载荷随 LB 倾斜度而变化,阻力随着屏障角的增加而减小。 通过五个设计标准评估的水动力学结果表明,与其他设计相比,上游倾斜设计,特别是具有大屏障角的设计,表现出更好的相对性能。
更新日期:2024-12-12
中文翻译:
用于自然洪水管理的河内渗漏屏障的水动力学
渗漏屏障是专为峰值流量衰减而设计的溪流自然洪水管理解决方案,其有效性取决于其设计。使用大涡模拟研究了由三个圆柱形测井组成的泄漏屏障 (LB) 周围的流动。主要的 LB 配置考虑了垂直对齐的日志,其他布局在上游和下游方向上倾斜为 15 、 30 和 45 。结果显示,LB 的正面投影堵塞面积导致上游流深增加,动量被重定向到底部间隙,形成初级壁射流,其峰值速度和相干性因 LB 设计而异,然而,在下游实现了类似的衰减。多孔 LB 允许不同的内部流路产生二次射流,根据屏障倾斜的方向向上或向下转移动量,从而影响主流特性和湍流特性。当屏障向下游倾斜时,湍流动能和垂直雷诺剪切应力减小。在上游倾角情况下,这些没有显示出显着的变化,其幅度与垂直配置中的相似。床层剪切应力随着屏障角的增加而降低,从而降低了局部冲刷和沉积物动员的风险。垂直 LB 以促进更大的沉积物床动员为代价实现了最大的回水上升。原木上的结构载荷随 LB 倾斜度而变化,阻力随着屏障角的增加而减小。 通过五个设计标准评估的水动力学结果表明,与其他设计相比,上游倾斜设计,特别是具有大屏障角的设计,表现出更好的相对性能。