北大港水库水质模拟及分析

ANALYSIS AND SIMULATION OF WATER QUALITY OF BEIDAGANG RESERVOIR

建立水动力、水体污染物输运及底泥污染物输运数值模型,采用有限差分与有限体积相结合的方法,对北大港水库氯离子进行动态数值模拟。通过对计算值和实测值的比较分析,验证了模型的可靠性。模拟了水库5种蓄供水方案,得到各方案流场及水体和底泥氯离子浓度动态变化规律,同时分析了流速、水体氯离子浓度与底泥氯离子浓度差对底泥氯离子释放速度及释放总量的影响。揭示了北大港水库各运行方式流场及水质变化规律,为更好地发挥引黄济津及南水北调东线工程调蓄水库作用提供保证。

This paper describes the dynamic process in the simulation of water quality of Beidagang Reservoir, a reservoir for the storage of water from the Yellow River for the water supply in Tianjin and a part of South-North Water Transfer Project. Using data collected from field-based investigation of the reservoir and using finite difference and finite volume methods, a hydrodynamic and sediment contamination transport model was established and calibrated. Taking chlorine ion as a simulation index, 5 types of operation modes for the reservoir were simulated. The general rules about the diffusion of contamination in water and sediment were obtained. Finally, it is confirmed that the factors influencing the velocity and quantity of sediment contamination release are velocity and consistency interval of contamination between water and sediment interstitial water. The results obtained in the present study might provide scientific references for the safety operation of the reservoir.