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Dec 31, 2015
Critical Run-Up Height on the Sea Wall
Authors: Akira Seyama and Akira KimuraAuthor Affiliations
Publication: Coastal Engineering 1986
Abstract
This study aims at clarifying the difference between irregular and periodic wave run-ups on a slope or a sea wall. Since hydraulic phenomena on a slope are the induced result of an interaction between a running up wave and a back-wash. The run-up height, therefore, has to be investigated in terms of a back-wash properties in addition to run-up wave properties. The experiments which are so designed that waves can run up on a slope without meeting back-wash, were conducted to evaluate the back-wash effects. The relative run-up heights Rr/HO of periodic waves in these experiments reached up to about two times as high as those of periodic waves which have the same steepnesses.
The run-up heights of irregular waves on a slope were also investigated experimentally. There are no clear relations between Rr/HO and HO/LO as those for periodic waves ordinary observed, and they distributed widely. The upper-most value of Rr/HO in the distribution for any HO/LO was almost equal to the value in the above experiment. The uppermost (critical) relative run-up heights Rr/HO for the given HO/LO and slope may exist. The differences between the critical and ordinary run-up height of periodic waves on the sea wall were also experimentally investigated. The difference is prominent when a sea wall is set on-shore from the shore-line. It reaches up to about 4 times when a sea wall is set a little on-shore from the shore line.
Some statistical discussion on the probability of the situation in which the critical run-up may be brought about is given at the last part.
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© 1987 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Akira Seyama
Prof. Dept. of Ocean Civil Engg. Faculty of Engineering, Tottori University, Tottori, Japan.
Akira Kimura
Associate Prof. Dept. of Ocean Civil Engg. Faculty of Engineering, Tottori University, Tottori, Japan.
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