Abstract
The jet flipped from flip buckets hits the dam’s downstream side as a free jet with an immense amount of energy, leading to bed erosion. Erosion of river bed materials downstream of dams could affect the performance of dams or power plants by altering the tailwater depth, rendering proper designs of controlling structures or erosion reduction methods highly indispensable in this regard. Hence, the hydrodynamic performance of A‐Jacks concrete armor units in controlling scour was examined in this study. A‐Jacks armors are applicable as a flexible protection without environmental risks often for bed erosion control. The desirable functionality of A‐Jacks armors depends on the flow hydrodynamic parameters such as velocity profile variations (U/UB), the Reynolds stresses ( and τv′w′), and the skin friction coefficient (Cf) created as a consequence of using A‐Jacks armors on beds. The size of A‐Jacks elements can have a role in increasing the flow turbulence to a certain depth so that after the impact of the flow with A‐Jacks armor, the vortices’ intensity as well as the shear stress affecting the bed gradually decreases. The results of the numerical model suggest that the surge in the flow turbulence energy dissipation downstream of flip buckets significantly mitigates the underlying conditions of scouring phenomena, which is evidence of A‐Jacks armors’ acceptable performance in scaling down scour depths.
Highlights
Use of A-Jacks concrete armor units represents one of the simplest and most practical systems protecting erodible beds. ese six-legged elements are designed to create a solid material when the legs are interlocked
Data collection stations are shown in Figure 6. e numerical model was run for each considering a constant flow rate, and the hydraulic parameters were analyzed
Investigation of the flow velocity profile gains great significance in finding the pattern of the flow jet energy dissipation downstream of flip buckets. e profile variation trend from the onset of jet formation to the end of erodible locations indicates the manner of flow development and turbulence variations
Summary
Use of A-Jacks concrete armor units represents one of the simplest and most practical systems protecting erodible beds. ese six-legged elements are designed to create a solid material when the legs are interlocked. Use of A-Jacks concrete armor units represents one of the simplest and most practical systems protecting erodible beds. Ese six-legged elements are designed to create a solid material when the legs are interlocked. A part of the original jet infiltrates the elements and the bed, and it is likely to develop bed sour. A blend of A-Jacks armors and riprap could help reduce the scour dimensions. In such an occasion, the armors and the riprap will be smaller in size and more convenient and economic to implement.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
