| Project/Area Number |
24656310
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
MAKINO Ikuyo 東北大学, 環境保全センター, 助教 (00542060)
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| Co-Investigator(Renkei-kenkyūsha) |
YAHAGI Yuji 芝浦工業大学, 工学研究科, 教授 (60265973)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | アオコ / 夜間計測 / 良水取水 / Microcystis / 良水取水システム / 夜間生態環境 |
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| Research Abstract |
In the nocturnal observation conducted during August and September, small lumps of bloom stayed at a fixed depth of water between 2 and 4 a.m. without any particular motion. Blooms on the water surface started to disperse starting around 2 p.m. and they are observed only scarcely on the surface by 4 p.m. Such cycle was observed every day until late September. The rhythm of this cycle indicates that behavior of photosynthetic algae cannot be explained only by photo-taxis. We could find that bloom goes down under water during night time and stays at a certain depth during certain period. However, we could not create good-quality water intake system to intake raw water of a good quality. To realize this, the following key issues need to be addressed: 1. Vertical motions spanning a few months through the initial phase to decline phase of bloom forming; 2. Determination of the toxicity of metabolite excreted by bloom forming algae; 3. Cell behavior after the decomposition of bloom.
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