| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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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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