2012 Fiscal Year Final Research Report
Evaluation of the effects of climate change on lake water environment as regional freshwater resources
| Project/Area Number |
22380132
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Kagoshima University |
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Principal Investigator |
MOMII Kazuro 鹿児島大学, 農学部, 教授 (40136536)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Yuji 佐賀大学, 低平地沿岸海域研究センター, 研究機関研究員 (60526911)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 水資源 / 現地観測 / 数値モデル / 溶存酸素 / 湖水温 / 安定度 / 全循環 |
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| Research Abstract |
In the observed results, the bottom layer of Lake Ikeda was under anoxic condition for 21 years from 1990 to 2010. In the middle of February 2011, when the mean air temperature from January to February decreased by 8°C, the lowest since 1987, vertical mixing due to surface water cooling occurred and consequently a uniform vertical dissolved oxygen (4.5 mg/L) profile was attained. The overturn was achieved for about 50 days during December to February. The lake water temperature and dissolved oxygen dynamics under the warming trends were investigated by the vertical one-dimensional numerical model. The numerical analysis reveals that 1984, 1986 and 2011, in which the values of lake stability index were negative, correspond to the years of the overturn.
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