| Civil Engineering and Mechanics |
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| Effect of thermal stratification on interflow travel time in stratified reservoir |
| Xiao-feng Zhang, Shi Ren, Jun-qing Lu, Xin-hua Lu |
| State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; South China Institute of Environmental Science, Guangzhou 510655, China; State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangzhou 510655, China |
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Abstract This study is focused on the impact of thermal stratification on interflow travel time. A quantitative relation between buoyancy frequency and interflow travel time is theoretically derived based on the Bernoulli principle of energy conservation. Experiments and numerical simulations are carried out to validate the applicability of the proposed relation. For experiments, interflow movement is successfully detected in a small-depth water tank by releasing a denser flow into a temperature stratification environment. For numerical simulations, a vertical 2D renormalization group (RNG) k-( model is developed to simulate the interflow. The results both of the experiments and of the numerical simulations verify our proposed theory. The derived analytic relation is useful for the prediction of contaminant travel time in reservoirs and in assisting pollution control.
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Received: 06 September 2014
Published: 03 April 2015
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