Abstract
Zengwen Reservoir, the largest water resource in Taiwan, has been seriously impacted by sedimentation, contributed mainly by typhoon floods. Therefore, it is chosen as a case study to investigate the effectiveness of an integrated reservoir management strategy of sediment routing and removal by constructing a dredged guiding channel to route turbidity currents generated during typhoon floods. The strategy is evaluated by simulating flood events of four return periods using a 3D numerical model, the effectiveness of which, with and without the dredged guiding channel, is compared in terms of the venting efficiency of reservoir outlets and the arrival time of turbidity currents. The numerical model is calibrated using the laboratory data and validated using the physical model and field data. The simulated results show a significant increase in the venting efficiency and a decrease in the arrival time of turbidity current for all the flood events in the presence of a dredged guiding channel. In addition, results also aid in predicting trapping efficiency based on the Brune curve trend for different capacity inflow ratios for single flood events. The findings demonstrate the feasibility and effectiveness of the integrated reservoir management strategy in the field before high-intensity flood events.
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Abbreviations
- a :
-
Viscosity coefficient
- C oi :
-
Sediment concentrations of outflow at time i
- C p :
-
Sediment particle concentration
- d :
-
Particle diameter
- g :
-
Acceleration due to gravity
- G′:
-
Buoyancy vector
- k :
-
Turbulent kinetic energy
- m :
-
Reynolds number (Re) dependent coefficient
- p′:
-
Modified pressure
- Q oi :
-
Outflow discharges at time i
- Q ST :
-
Total inflow sediment yield
- T :
-
Duration of the flood event
- u :
-
Kinematic viscosity of water
- U i,j :
-
Velocity components
- VE :
-
Venting efficiency
- w f :
-
Fall velocity of a sediment particle
- w tf :
-
Terminal fall velocity of a particle in clear water
- x i,j :
-
Cartesian coordinates
- ε :
-
Turbulence dissipation rate
- ρ :
-
Mixture density
- ρ s :
-
Particle density
- σ p :
-
Turbulent Prandtl number
- ρ w :
-
Water density
- v eff :
-
Effective viscosity
- v t :
-
Turbulence viscosity
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Acknowledgments
The authors acknowledge the Southern Region Water Resources Office, Taiwan, for providing the essential data for analysis and simulation. The authors also appreciate the Hydrotech Research Institute of the National Taiwan University and National Chung Hsing University for providing computing facilities and technical support.
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Imtiyaz, N., Lee, FZ., Lin, GF. et al. Modeling and Analysis of Turbidity Currents in a Reservoir with the Dredged Guiding Channel. KSCE J Civ Eng (2024). https://doi.org/10.1007/s12205-024-1054-z
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DOI: https://doi.org/10.1007/s12205-024-1054-z