2011 Fiscal Year Final Research Report
Relationship between density current in Lake Biwa and snow at northern part of catchment area of Lake Biwa
| Project/Area Number |
22700853
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geography
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| Research Institution | Ochanomizu University |
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Principal Investigator |
HASEGAWA Naoko (ISHIGURO Naoko) お茶の水女子大学, 大学院・人間文化創成科学研究科, 准教授 (60433231)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 密度流 / 溶存酸素 / 水温 / 融雪水 / 琵琶湖 |
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| Research Abstract |
This study verifies whether snowmelt water from the Ane River serves as the density current in Lake Biwa by measuring the water temperature, water current, and other water elements such as conductivity, oxygen, and turbidity by using a mooring logging system at the embouchure of the river. We found that the water mass was characterized by a relatively low temperature, high oxygen content, and low conductivity near the bottom as compared to the surrounding water. This water mass appeared at face of embouchure for three days. With such characteristics, this water would be neither underground water(which has a lower oxygen concentration than lake water) nor coastal cooling water(whose conductivity should be the same as the surrounding lake water, and which should appear only in the morning and not last for several days). In conclusion, water at the bottom is possibly the density current originated from Ane River.
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