| Project/Area Number |
05454099
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | University of Tsukuba |
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Principal Investigator |
SUZUKI Mitsukata University of Tsukuba, Agricultural & Forest Eng., Professor, 農林工学系, 教授 (40018528)
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| Co-Investigator(Kenkyū-buntansha) |
ADACHI Yasuhisa University of Tsukuba, Agricultural & Forest Eng., Reseach Associate, 農林工学系, 助手 (70192466)
MIYAZAKI Tasuo University of Tsukuba, Biological Sci., Associate Professor, 生物科学系, 助教授 (80142230)
ENDO Oritaro University of Tsukuba, Agricultural & Forestry, Professor, 農林学系, 教授 (30143754)
MAEKAWA Takaaki University of Tsukuba, Agricultural & Forest Eng., Professor, 農林工学系, 教授 (40015665)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1994: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | water quality / upland irrigation / blue-green algae / Chl-a / design criteria / Kasumigaura Irrigation Project / UV radiation / ozonation |
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| Research Abstract |
The contamination of blue-green algae from euntrophic lake or river into upland irrigation system has caused degradation of water quality which will bring about various disturbances for proper operation. In order to establish the design criteria to cope with this difficulty, we carried out the following collaboration.
(1) In order to analyze the present situation of water quality degradation in the irrigation system, major items of water quality and flow rate were measured systematically for the case of Kasumigaura Irrigation Project. Statistical analysis on the relation between each items clarified the dynamic process of change of water quality during its transportation through the system. On the basis of this result, allowable concentratioon of Chl-a which can be regarded as the most important index of blue-green algae was estimated.
(2) Effects of the quality of irrigation water on the grows and yield of common buckwheat were examined under pot culture in the green house. The result showed no significant change.
(3) Hydraulic properties of blue-green algae colony, i.e., the density of algae cell and basic consumption of oxigen were determined by a series of experiments. The obtained value will provide useful information s for the estimation of water quality load and removal efficiency of blue-green algae.
(4) The applicability of water treatments by means of an ozonation, an UV radiation and an addition of tannicacid to prevent or to reduce the blooming of algae were examined. Biological activity after treatment were expressed as a function of radiation intensity and elapsed time. It was found that the formation of a floc has remarkable influence on the survival of blue-green algae.
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