| Project/Area Number |
59350037
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Building Planning and City Planning
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| Research Institution | Yamaguchi University |
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Principal Investigator |
NAKANISHI Hiroshi Yamaguchi Univ. Faculty of Engineering Professor, 工学部, 教授 (70035020)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Munetaka Yamaguchi Univ. Faculty of Engineering Assistant, 工学部, 助手 (80101070)
MORIOKA Toru Osaka Univ. Faculty of Engineering Assistant Professor, 工学部, 助教授 (30029350)
KUSUDA Tetsuya Kyusyu Univ.Faculty of Engineering Assistant Professor, 工学部, 助教授 (50037967)
NAKASHIMA shigeki Kumamoto Univ.Faculty of Engineering Professor, 工学部, 教授 (10109671)
UKITA Masao Yamaguchi Univ.Faculty of Engineering Assistant Professor, 工学部, 助教授 (60035061)
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1985: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1984: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | Self-purification / Pollution load / River / Runoff-rate / Deposit / Estuary / 土壌浄化容量 / 汚濁作用 |
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| Research Abstract |
In this study,The singificance of self-purification was newly evaluated and practical application of it was inveatigated in rivers.lakes, aestuarys and soil.The following results were obtained from this study.
1. Evaluation of self-Purification:Two types of self-Purification were difined. Type 1 means the reduction of pollutants from the objective water body and type 2 means the reduction of pollutants in the objective water body. Type 1 can be applied to all kinds of pollutant,but type 2 is applied to only decomposible pollutants such as organic matters. The relationships between self-purification ablity of type 2 and concentration of pollutants was shown as possitive correiation.
2. Runoff of pollutants and self-Purification in rivers: A mathematical model was proposed, which expiained daily variation of pollutant runoff by means of combination of deposit of pollutants in dry weather and runoff of it in rainy weather. And the other model which explained BOD reduction in a river was proposed too.
3. Self-purification in estuarys:Material balance of pollutants was measured in two estuarys. And roles of phyteplankton and suspended matters were evaluated.
4. Self-purification in soil: Self-purification capacities such as adsorption,filtration,chemical reaction, biological reaction were evaluated quantitatively in several.case studies.
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