2005 Fiscal Year Final Research Report Summary
Beach profile change during storm
| Project/Area Number |
16560452
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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 | Chuo University |
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Principal Investigator |
MIZUGUCHI Masaru Chuo University, Faculty of Science and Engineering, Professor, 理学部, 教授 (50011234)
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| Project Period (FY) |
2004 – 2005
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| Keywords | berm erosion / swash / fileld |
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| Research Abstract |
Some twenty Ultrasonic wave gages, which also detect the bottom level without water, are employed along the Hasaki observation pier, covering from the swash zone to outside of the surf zone. Observation has been carried out continuously and the data during a very severe storm is analyzed.
The followings are revealed from hourly-average based analysis. 1)Berm erosion starts when large waves with significant long wave energy reach the berm top as the tide rises. 2)Berm erosion stops after some hours when the eroded beach slope becomes mild or the berm disappears though the same wave condition continues.
Wave by wave approach is also tried for the swash oscillation and beach profile change. It is shown that the net volume flux of the sediment at the offshore end of the awash zone is positively proportional to the difference between integrated onshore 1.5 power of Shiels parameter and the offshore one.
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