A study on the low DO distribution in Lake Kasumigaura
2005
Nakasone, H.(Ibaraki Univ., Ami (Japan). Coll. of Agriculture) | Kaburagi, M. | Kuroda, H. | Kato, T.
Low DO distribution is generally found at the bottom of lakes and ponds. Usually, when wind blows in such condition; the water with low DO content is swept up to the surface at windward, and high DO content is sank into the bottom at leeward. These phenomena were observed at Kitaura of the Lake Kasumigaura as well. However, different phenomenon was observed at Nishiura of the Lake Kasumigaura. The DO concentration was high at both windward and leeward of offshore in Nishiura of the Lake Kasumigaura. Therefore, using 3-D water quality model, we tried to clarify why the different phenomena occurred in Nishiura and Kitaura. There were some simulations for the current movements of Kasumigaura; however, there were no water quality 3-D models. The simulated results of the flow directions and velocity distributions were different from those of the other researchers; however, velocity distribution data, which were observed by the hydraulic model experiment, coincide well with our simulation results. The simulation results suggest that the unique DO distribution observed at Nishiura was correct. Therefore, we estimated that actual lake current will show the movements which are similar to the simulation results.
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