نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه سازه‌های آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران.
2 گروه سازه های آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
During flood events, a river naturally transports significant amounts of sediment from its upstream watershed. Due to the reduction in flow velocity in calm and deep areas such as dam reservoirs, coarser sediments carried by the flow tend to settle in a zone known as the plunge area of the turbidity current. The Dez Dam, located in the northern part of Khuzestan Province, plays a crucial role in providing drinking water, irrigation, and flood control. Investigating the turbidity plunge zone can yield valuable insights to support the management of sediment-laden flow discharge through bottom outlets and sediment bypass tunnels. In this study, the movement and behavior of muddy turbidity currents within the Dez Dam reservoir were simulated using the FLOW-3D computational fluid dynamics (CFD) code. The RNG k-ε turbulence model was employed to simulate field-scale conditions. Numerical modeling results indicate that for flood discharges exceeding 300 m3/s and reservoir water levels above 320 meters above sea level, the turbidity current plunging depth is formed at a distance ranging from 20 to 27 kilometers upstream of the dam structure. A comparison between the estimated submergence depths of the turbidity currents and previously developed empirical formulas reveals a direct relationship with flood discharge and an inverse relationship with the sediment concentration entering the reservoir. The model validation results demonstrated a strong agreement between the simulated plunging depths and those predicted by empirical relationships, with a determination coefficient (R²) of 0.938, confirming the model's high accuracy.
کلیدواژه‌ها [English]
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