A deep water aeration system that stretches from above the water column to the hypolimnion creates a medium that allows atmospheric oxygen and hypolimnetic water to mix. Minimum dissolved oxygen requirements of freshwater fishĭissolved oxygen levels often stratify in the winter and summer, turning over in the spring and fall as lake temperatures align.Ī technological innovation that has been used to avoid the oxygen depletion of the hypolimnion is called Hypolimnetic Aeration. The oxygen requirements for some freshwater organisms becomes restored until thermal stratification separates the layers in the next season When lake turnover occurs, however, the layers begin to mix and exchange dissolved oxygen throughout the water column. This separation causes the hypolimnion to contain a “finite” level of dissolved oxygen that may be quickly used up by benthic organisms Since thermal stratification causes density differences that do not allow water layers to mix, the hypolimnion becomes completely separated from any gas exchange with the atmosphere and the overlying layers. In terms of dissolved oxygen, lake turnover is extremely important for aquatic organisms. Lakes can be categorized based on their stratification and circulation patterns 3ĭue to regional climatic differences affecting separate lake systems, their turnovers can have contrasting features Thermal stratification is broken down by seasonal temperature changes, and the lake begins to take a roughly uniform temperature, and thus, uniform density profileĪt this point, wind energy will thoroughly mix the water layers. The lower layer, the hypolimnion, is usually too deep to be affected by wind, solar radiation and atmospheric heat exchanges, which causes this layer to have a stable temperature and keeps it roughly around water’s maximum densityĭuring the transition from Summer to Fall and Winter to Spring, a turnover occurs within the lake The upper layer, the epilimnion, is exposed to solar radiation and thermal contact with the atmosphere, keeping it warmerĭuring the Winter, inverse stratification occurs within the lake due to a layer of ice forming on top which pr events mixing Lake Turnover is the process of the dense lower layer of a lake rising to become the upper, less-dense layer 1Ī lake’s turnover can be affected by many factorsĭuring the Summer, thermal stratification occurs within the lake due to layers separating by temperature and density
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