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Two-Dimensional Depth-Averaged Numerical Modeling of Sediment Transport and Assessment of the Effects of Groynes Downstream of the Aras Dam Using the CCHE2D Model
Farshid Khosh-Akhlag1 , Bahador Fatehi-Nobarian2 , Majid Farrin *3
1- Graduate Student, Department of Civil Engineering-Geotechnic, Ara.C., Islamic Azad University, Jolfa, Iran.
2- Assistant Prof. Department of Civil Engineering of Hydraulic Structures, Ara.C., Islamic Azad University, Jolfa, Iran.
3- Assistant Prof. Department of Civil Engineering-Geotechnic, Ara.C., Islamic Azad University, Jolfa, Iran.
Abstract:   (22 Views)
Sedimentation downstream of dams is considered one of the most important factors affecting river morphological changes and reducing the effective storage capacity of reservoirs. In this study, the hydrodynamic behavior of flow and sediment transport patterns downstream of the Aras Dam were investigated using the two-dimensional depth-averaged numerical model CCHE2D. The model includes hydrodynamic, sediment transport, and bed morpho dynamic sub-models and was calibrated using hydrological data, bed topography, and sediment characteristics of the study area. To evaluate the model's sensitivity, the effects of parameters such as Manning’s roughness coefficient, turbulence model, sediment particle size, boundary conditions, and the type of sediment transport capacity relationship were examined. Overall, the results indicated that regions with high flow velocity and shear stress are prone to local scour, whereas are::::::as char::::::acterized by eddies and low velocities experience the highest levels of deposition. In addition, increasing discharge led to higher sediment transport rates and altered the distribution pattern of shear stress in the channel. Sensitivity analysis showed that the model is highly sensitive to boundary conditions, the roughness coefficient, and sediment transport capacity relationships, while the influence of the turbulence model on sediment transport results is limited. Simulation results also showed that the use of spur dikes can reduce the amount of sediment transported to critical areas by approximately 30%. The findings of this study demonstrate the capability of two-dimensional depth-averaged models to analyze hydrodynamic and morpho dynamic processes downstream of dams and may be useful for sediment management and the design of erosion control structures in the Aras River.
 
Keywords: Aras Dam, Sediment transport, CCHE2D model, Two-Dimensional Depth-Averaged Model, Spur Dike, River Morph Dynamics
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Highlights
  • CCHE2D successfully simulated hydrodynamic and sediment transport processes downstream of the Aras Dam.
  • High flow velocity and bed shear stress were associated with erosion, while low-velocity recirculation zones promoted sediment deposition.
  • Sediment transport was highly sensitive to Manning’s roughness, downstream boundary conditions, and sediment transport formulations.
  • Increasing flow discharge increased sediment transport and altered the spatial distribution of bed shear stress.
  • Groynes reduced sediment transport by up to approximately 34%, demonstrating their effectiveness for sediment management.

Type of Study: Research Paper | Subject: CFD
Received: 2026/05/10 | Accepted: 2026/09/1
فایل صوتی چکیده مقاله [MP3 2908 KB]  (2 Download)
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