Water quality response characteristics and improvement effect of thennal stratification in a plain region reservoir
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Abstract:
Aiming at the thermal stratification characteristics of plain reservoirs and their impact on water quality, a vertical two- dimensional water temperature model was developed using the CE-QUAL-W2 model to simulate the characteristics of water temperature changes throughout 2018. The absolute mean error of the three calibration sections was 0. 53 °C, 0. 35 °C and 0. 14 °C respectively. The seasonal variation of water temperature and water quality response characteristics of the reservoir were ana lyzed based on simulation results and monitoring dat& A mobile water pump was proposed based on the axial flow pump mixed aeration technology to increase the DO concentration in the bottom of the reservoir. The improvement effects of the mobile water pump on vertical water quality were preliminarily analyzed based on the monitoring data. The results showed that the reser voir presented a singlocycle mixed mode throughout the year (stratified period: May to November, mixed period: December to April). The reservoir formed a stable thermal stratification structure in summer and formed a hypolimnion with a thickness of a- bout 8 m anoxic zone (DO concentration is less than 2 mg/L). The release amount of pollutants (iron, manganese , total nitro gen, total phosphorus, COD, ammonia nitrogen, and so on) in hypolimnion was much larger than the epilimnion and the thermo cline because of the anaerobic environment. The mobile water pump can effectively improve DO concentration in the hypolimnion and weaken the thermal stratification structure (the DO concentration in the working center increased from 0. 2 mg/L to 0. 8 mg/L,and the thermocline thickness decreased by 4 m).
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