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Apr 26, 2012
Analysis on Typhoon-Induced Shoreline Changes Using Remote Sensed Images
Authors: Toshiyuki Asano [email protected], Jun-ichi Khono [email protected], Tomoaki Komaguchi [email protected], and Takao SatoAuthor Affiliations
Publication: Ocean Wave Measurement and Analysis (2001)
Abstract
To study beach morphological change, applicability of remote sensed images has been investigated. Shoreline displacements analyzed by satellite imageries were comparing with field survey data in the corresponding period. The agreements are found to be satisfactory, thus the present analysis using satellite imageries are validated. Next, short term beach evolutions induced by typhoon attack are discussed. Although the analyzed shoreline displacements do not directly correspond to typhoon induced shoreline change, most of the obtained characteristics are found to be physically reasonable. Also, the succeeding shoreline change suggests that beach recovery process occurs after the typhoon-induced erosion. Furthermore, to explain the physical process of the typhoon induced shoreline change, numerical analyses on the wave hindcasting and wave transformation have been conducted. The results of typhoon hindcasting and shallow water transformation reveal that even a small change in wave incident angle results in a great difference in the wave height distributions in the alongshore direction of the study site. This implies that temporal change of wave angle associated with the typhoon-passing is an important factor on beach deformation.
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© 2002 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Affiliations
M.ASCE
Prof., Dept. of Ocean Civil Engrg., Kagoshima Univ., 1-21-40, Korimoto, Kagoshima, 890-0065, JAPAN. E-mail: [email protected]
Senior Engineer, Kagoshima Environmental Science Association, 1-15 Nanatsu-jima, Kagoshima, 891-0132, JAPAN. E-mail: [email protected]
Manager, Tetra Co., Div. of Promotion for Development of Fishery Infrastructure, 6-3-1 Nishi-shinjuku, Shinjuku, Tokyo, 160-8350, JAPAN. E-mail: [email protected]
Takao Sato
Former Head, Shimonoseki Investigation & Design Office, MLIT, 4-6-1, Takesaki-cho, Shimono-seki, 750-0025, JAPAN
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