Abstract：Aiming at the common problems of conventional destratification technologies such as high energy consumption and low energy efficiency, a pilot model reservoir with a thermal structure evolved from the natural convection was developed and constructed, the feasibility of developing internal waves induced by aeration was explored, and the process and effectiveness of destratification by internal waves were analyzed. Periodic outflow from the water-lifting aerator could act as a disturbing source to generate internal waves in stratified water environments, and the periods and amplitudes of internal waves depended on the air flowrate. Under the experimental air flowrates of 0.07~0.28m3/(m2·h) and temperature gradients of 0.29~0.48℃/m in the thermocline, the destratification process was mainly characterized by reducing the temperature difference between epilimnion and hypolimnion, impelling the thermocline downwards and thinning the hypolimnion,the speed of destratification increased with the air flowrate but decreased with the temperature gradient. Heat exchange between water layers of different temperatures could be enhanced through vertical fluctuations and horizontal propagation by internal waves. Compared with the conventional destratification by circulated flow, under the temperature gradients of 0.32℃/m and 0.46℃/m, when the air flowrate was increased from 0.07m3/(m2·h) to 0.28m3/(m2·h), the efficiencies of destratification by internal waves could be increased by 25.0%~40.0% and 41.2%~60.0%, respectively.
孙昕, 卞晶, 解岳, 叶丽丽, 马兰. 曝气诱导内波破坏水库水温分层的过程与效果[J]. 中国环境科学, 2015, 35(2): 434-441.
SUN Xin, BIAN Jing, JIE Yue, YE Li-Li, MA Lan. Process and effectiveness of destratification by aeration-induced internal waves in a reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(2): 434-441.
