Abstract:Under temperature gradients of 0.18~0.60℃/cm, using a self-designed physical model reservoir with a thermally stratified structure was used, the process of destratification by aeration-induced internal waves was explored in the limited water of the model reservoir, the relationship between the falling rate of the thermocline and characteristic parameters of internal waves was analyzed, and the mechanism of destratification by internal waves in limited fluids was revealed. The experimental results showed that as the internal waves induced by aeration could be observed in the thermocline before the waters were completely mixed, the amplitudes of internal waves were higher in the middle of thermocline and shorter on the edge of thermocline.During the destratification, the thermocline fell gradually from its original position to the reservoir bottom, the falling rate gradually decreased from 0.24m/s to 0.08m/s, but the duration times, periods and amplitudes of internal waves roughly increased by 100%、200% and 33% respectively; under similar conditions, the falling rate of the thermocline also decreased with the increase of temperature gradients. The aeration-induced internal waves were not broken during its propogation in the limited waters of the model reservoir. This result indicated that the mixing in limited stratified waters is mainly achieved by the alternant transport of water particles in the vertical direction during destratification by the aeration-induced internal waves, which is different to the conventional theory of mixing due to the breaking of internal waves in the open oceans.
孙昕, 李丹, 李选龙, 解岳. 曝气诱导内波破坏水库水温分层的机理[J]. 中国环境科学, 2015, 35(6): 1847-1854.
SUN Xin, LI Dan, LI Xuan-Long, JIE Yue. Mechanism of destratification by aeration-induced internal waves in a reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(6): 1847-1854.