Thermal Stratification in Saline Shallow Water Bodies
Thermal Stratification in Saline Shallow Water Bodies
复制标题
咸水浅水体中的热分层
DOI：
10.11189/bita.41.107
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Panitan Kaewjantawee
中科院分区：
文献类型：
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作者：
Monton Anongponyoskun;Akinori Ozaki;Panitan Kaewjantawee
由于白天吸收的热量和夜间释放的热量，水体中会发生热分层。了解浅水水温的变化规律对水产养殖的实际应用具有重要意义。在这项研究中，在泰国Prachuap Khirikhan省Kasetsart大学Klongwan渔业研究站，研究了三个养殖池塘的封闭咸水水体的热分层，初始盐度分别为0、15和30 psu。2017年6月1日至10月31日，以10 min为间隔测量了天气和水温垂直剖面图。观测期间正午太阳辐射约为400 ~ 700 W/m2，气压大于100 kPa，气温约为25℃~ 35℃，降水持续时间短，观测期间降水量少。在整个观测期间，90%的观测风速小于4节，其余10%的观测风速在5至10节之间。夜间观察到风速很大。日出后，白天出现短期分层现象，随着水面开始冷却，分层现象逐渐消失。分层的消失是由于空气和水面之间的热交换造成的。在盐水中，由于盐水的热容量低于淡水，因此白天和夜间的热交换量都高于淡水。
Thermal stratification occurs in water bodies because of the heat that is absorbed during daytime and the heat that is released during nighttime. Understanding the behavior of water temperature in shallow waters is important for practical applications in aquaculture. In this study, thermal stratification in the closed saline water bodies of three aquaculture ponds has been investigated with different initial salinities of 0, 15, and 30 psu at the Klongwan Fisheries Research Station, Kasetsart University in the Prachuap Khirikhan province, Thailand. Further, the weather and the vertical profiles of water temperature were measured at 10-min intervals from June 1 to October 31, 2017. During the observation period, the solar radiation at noon time was approximately 400-700 W/m2, the air pressure was higher than 100 kPa, and the air temperature was approximately 25 C-35 C. Further, rainfall occurred only for a short duration, and only a low amount of rainfall was received during the observation period. Over the whole observation period, 90% of the observed wind speeds was less than 4 knot, while the remaining 10% of the recorded speeds was high and ranged from 5 to 10 knot. A high wind speed was observed during nighttime. After sunrise, short-term stratification was observed during daytime, and stratification disappeared gradually as the water surface started cooling. The disappearance of stratification was caused by the thermal exchange between the air and the water surface. In case of saline water, the amount of heat exchanged during daytime and nighttime was higher than that observed in case of fresh water because the heat capacity of saline water was lower than that of fresh water.