2012 Fiscal Year Final Research Report
Study on geomorphic environment during the Holocene and influence of human activities in lower part of the Iwakigawa River
| Project/Area Number |
22500983
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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 |
Geography
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| Research Institution | Hirosaki University |
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Principal Investigator |
KOIWA Naoto 弘前大学, 教育学部, 教授 (70296002)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 十三湖 / デルタ / 古環境 / 珪藻分析 / 完新世 |
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| Research Abstract |
The purpose of this study is to reconstruct the geomorphic environmental in lower part of the Iwakigawa River, by carrying out several type of analyses of delta deposits. The result of this study indicates that Lake Jusan located in the lower part of the Iwakigawa River had been a freshwater lake during 5,300-3,800 cal BP and a lagoonal brackish lake since 900 cal BP. It was revealed that sedimentation rate in the study area in the present is one-tenth than value calculated from sediment based on delta deposits
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