| Project/Area Number |
11680091
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
自然地理学
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| Research Institution | Joetsu University of Education |
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Principal Investigator |
SATO Yoshinori College of Education, Joetsu University of Education, Professor, 学校教育学部, 教授 (40143185)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | lake water / acidification / pH / Joetsu District / lake environment / 湖 / 水質 / 融雪 / 滞留時間 |
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| Research Abstract |
Lake water of Joetsu district in Niigata Prefecture have been analyzed for chemical and isotopic compositions in order to know the deciding factors of lake water pH values. Similarly, those of the Pacific coast side lakes have been investigated. The field researches were conducted in November 1999 and May 2000.
The results of this study is summarized as follows ;
1 There were some acid lakes in this district. But the pH values had a large variation, to be necessary to continue the researches.
2 The pH values were low where the residence time of the groundwater inflow was relatively short in teh catchment area.
3 The values of electric conductivity was effected by the position and origin of the lakes and was useful to know the mixing ratio of lake water and groundwater.
4 There was a week correlation between the pH values and the chemical composition of lake water.
5 There was a clear distinction in the isotopic composition between the lakes in the Japan Sea side and those in the Pacific Ocean side.
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