| Project/Area Number |
10650516
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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 |
水工水理学
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| Research Institution | Akashi National College of Technology |
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Principal Investigator |
DAN Kazuhide Akashi National Civil Associate Professor, 都市システム工学科, 助教授 (80171924)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | wave control / permeable breakwater / Holography |
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| Research Abstract |
One purpose of this research is to confirm the wave-damping capacity behind the holographic pile structures and the wave-height reflection capacity in front of these structures. The other purpose is to develop the new wave meter using the camera at the sea bottom. It is useful to measure the wave heights in the wide observation plane simultaneously by means of this new wave meter.
The following results are confirmed.
(1) It is possible to move the wave-controlled-region by changing the pile arrangement. For example the shape of piles, the rows of piles, the distance between piles and so on are to be changed.
(2) Because of the small wave-damping capacity (25% approximately) at present it is necessary to calculate the mean wave height in a control circle in order to find the position of the wave-controlled-region.
(3) There are two steps to measure the wave height using the camera at the sea bottom. The first step is to record the image using the camera at the sea bottom in the observation plane near the wave surface in water. This image is created according' to the refraction of the natural incident light waves at the interface between water and air. The second step is to calculate the wave height by applying the Suzuki-Sumino's method to this recorded image. It is necessary to decide the brightness on the wave surface, the widths of the observation plane, the water depth and the distance between the camera and the observation plane exactly in order to estimate the wave height accurately.
(4)It is necessary to clear the effect of the oblique incident light waves. It is found that the light and dark portions in the recorded image move toward the opposite side of the incident waves in the incident direction when the light wavers travel to the wave surface obliquely with respect to the vertical.
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