| Project/Area Number |
01550422
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
都市工学・衛生工学
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| Research Institution | Gunma University |
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Principal Investigator |
KURODA Masao Gunma University, Civil Engineering, Professor, 工学部, 教授 (40008446)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAKIBARA Yutaka Gunma University, Civil Engineering, Lecturer, 工学部, 講師 (80143204)
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| Project Period (FY) |
1989 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Eutrophication / Ecological model / Musty odor / Phormidium tenue / 水質モデル / 水質管理 / 貯水池 |
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| Research Abstract |
Excessive growth of Phormidium tenue and musty odor due to it have been observed recent years in lake Kusaki located In Gunma, Japan. Variations of the algal growth and water qualities in the lake were observed for two years, and investigated a possibility of forecasting the excessive growth from a simple ecological model with known parameters which were generally reported in former studies. The field surveys showed that distributions of temperature and nutrient concentrations were significant in the vertical direction but not in horizontal, therefore, a vertical one-dimensional mathematical model consisted of the heat and mass balance equations was used. The model fairly evaluated the seasonal changes in water qualities of TH, TP, TOC and Chl. a as well as the thermal stratification and turnovers. Although some modifications of the model should be necessary to evaluate the P. tenue population exactly, the growth pattern which had two peaks in early and late summer in 1990 and 1991 were estimated reasonably well by assuming a maximum specific growth rate of 2.5 d^<-1>.
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