2012 Fiscal Year Final Research Report
Field observations of the three-dimensional structure of wind-driven currents due to the formation of secondary circulations and the development of numerical model.
| Project/Area Number |
22560523
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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 |
Hydraulic engineering
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| Research Institution | Gunma University |
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Principal Investigator |
UZAKI Kenichi 群馬大学, 大学院・工学研究科, 准教授 (30443906)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 吹送流 / ラングミュア循環流 / H-ADCP / 水温構造 |
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| Research Abstract |
Field observations had been conducted at the Watarase retarding basin in the Gunma prefecture for a month by using the H-ADCP in order to observe the horizontally-periodic profile of wind-driven current velocity due to the formation of Langmuir circulations :LCs easily and frequently. At the Watarase retarding basin, streaks of air bubbles were often observed under the strong wind. It suggested the formation of LCs beneath the water surface. From the observation results, the horizontally-periodic profiles of wind-driven current velocity with the high- and low-speed zones alternatively were shown under the strong wind. The horizontal profile of wind-driven currents at the surface were estimated from the observation results, and it showed that the maximum speed in the high-speed zone were the twice of the generally-estimated surface speed of wind-driven currents. It suggested that the consideration of LCs to the wind-driven currents revealed the revision of advection time of surface floating matter.
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