Abstract
The main objectives of the present work are to investigate the hydraulic characteristics of the dam discharge flow and its impact downstream. Building information modeling technology is adopted to generate the terrain entity and hydraulic structures. The calculation of the dam discharge and flood routing simulation is achieved by employing Reynolds-Averaged Navier-Stokes equations with the RNG k-ε eddy viscosity model for its turbulence closure, as well as the Volume of Fluid method. An urban flood experiment and the field measurement records are utilized and validated the model accuracy. The flow field is obtained to assess the dam working conditions under different water levels. The results show that the maximum downstream flow depth, the maximum discharge capacity and the hydraulic jump length under normal water level is 18.6 m, 13,800 m3/s, and 108 m, respectively. The dam satisfies the safety demand under different water levels but close attention should be paid to the dam foundation, especially around the incident points of the discharge flow. Complex turbulent flow patterns, including collision, reflection, and vortices, are captured by three-dimensional simulation. The numerical simulation can assist the reservoir management vividly, so as to guarantee the stability of the dam operation.
Highlights
Dams are constructed as water storage to compensate for fluctuations in the catchment area and to generate electricity
The results show that the discrepancies are not enormous, with the RMSE is 0.3 m, indicating that the simulation accuracy can satisfy the demand of engineering application
Free surface is traced by the Volume of Fluid (VOF) model
Summary
Dams are constructed as water storage to compensate for fluctuations in the catchment area and to generate electricity. Efficient operation of existing water infrastructures is considered important for effective water resources management. Uncontrollable amounts of discharges released from the dam discharge structure have caused failures of dams [1]. Accidents due to a high level of energy being stored in the reservoir will give a negative impact on the downstream area and have disastrous effects on environment, society and economy [2]. Provision of a hydraulically efficient and structurally strong discharge structure is very significant for the safety of the dam, the life and property along the river down below [3,4,5]. It is crucial that these structures are optimized functionally and economically in the individual project. Understanding how the operation of a newly built reservoir affects the downstream river flow is vital for protecting human life and property downstream
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