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Daily Cyclic Variations of Dissolved Oxygen in a Closed Water Area with Floating Aquatic Plants

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032193,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13798) @2003
Authors:   Sachio Sumimoto, Akinori Ozaki, Ken Mori, Eiji Inoue, Tomokazu Haraguchi
Keywords:   Field Observations, Daily Cyclic Variation, Dissolved Oxygen, Closed Water Area, Floating Aquatic Plants, thermal disturbance

In a closed water area with a poor rate of exchange with external water, such as a reservoir or a creek, eutrophication, lack of oxygen in the bottom layer, and other water quality problems easily arise. In order to preserve and improve the water environment in such a stagnant closed water area, it is essential to clarify the response characteristics of environmental elements to the various biological and physical processes present in a closed water area.

In a eutrophicated water area, it is extremely important to comprehend short-term variation such as the daily cyclic variation of DO concentration for preservation and improvement of the water environment. In the present study, we examined how the existences of floating aquatic plants contribute to the disturbances and properties of daily cyclic variation of the DO concentration in a closed water area containing floating aquatic plants from field observations.Field observations dates indicated that when only thermal disturbance acted in a closed water area with floating aquatic plants, the DO concentration based on photosynthesis by solar insolation was higher than that of observation sites without floating aquatic plants. Additionally, water temperature and DO concentration perform a daily cycle of mixed layer formation at night and stratification in the daytime.

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