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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 www.asabe.org
Citation: Paper number 032193, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.13798) @2003Authors: 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.