IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 5- FLOOD RISK MANAGEMENT AND ADAPTATION : STUDY FOR STABILITY OF ARMOR CNCRETE BLOCKS COVERING COASTAL DIKES FOR OVERFLOW IN TSUNAMI
STUDY FOR STABILITY OF ARMOR CNCRETE BLOCKS COVERING COASTAL DIKES FOR OVERFLOW IN TSUNAMI
Author : KUNIAKI OI , KENJIROU HAYASHI , TSUYOSI TADA & YOSHIHISA MIYATA
In 2011, a tsunami caused by an earthquake off the Pacific coast of Tohoku seriously damaged many coastal structures. It is important to reinforce these coastal structures with the concrete blocks and to give the function of tenacious structures. In case of coastal dikes, the stability of concrete blocks and the damage of coastal dikes may be affected by the fluid forces acting on the concrete blocks armoring on slope just near the crest of dike in the side of land for the overflow in tsunami. The stability of blocks is also affected by the types of blocks and there geometrical arrangement and the damage of these coastal structures are affected by the strength of foundation in spillway. Hydrodynamic laboratory experiments were carried out in a wave flume 40m long, and 0.8m wide for the damage of concrete blocks armoring on the slope in side of coastal dike for the over flow in tsunami. The force and moment acting on a concrete block just adjacent to the crest of the dike are measured by using a multi component load cell. The velocity distributions around this concrete block are measured by using a Laser Doppler anemometer with 2 velocity component systems. The relationship between the velocity distributions on the concrete blocks and pressure distributions on the mound of slope are obtained. The relationship between the fluid forces and overturning moment Mot acting on a concrete block adjacent to the crest of dike in the side of land are also obtained. In the case of overturning moment Mot exceeds the resistance moment caused by the weight of concrete block, the concrete block turns over from the slope of coastal dike.
File Size : 661,681 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 5- FLOOD RISK MANAGEMENT AND ADAPTATION
Date Published : 20/04/2016
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