PREDICTION OF BEACH CHANGES ON KOZU AND MAEKAWA COASTS IN ODAWARA CITY

PREDICTION OF BEACH CHANGES ON KOZU AND MAEKAWA COASTS IN ODAWARA CITY

A large submarine canyon is located offshore of the Morito River mouth 2.5 km east of the Sakawa River, and an embayment surrounded by a steep slope approaches the shoreline. Severe beach erosion occurred on the Kozu and Maekawa coasts behind this submarine canyon. The shoreline changes of these coa...

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Veröffentlicht in:Doboku Gakkai Ronbunshu. B3, Kaiyo Kaihatsu Ser. B3 (Ocean Engineering), 2021, Vol.77(2), pp.I_835-I_840
Hauptverfasser: UDA, Takaaki, YOSHIOKA, Atsushi, SASAKI, Nobumitsu, FUJITA, Masanori, OHTANI, Yasuro, SERIZAWA, Masumi
Format: Artikel
Sprache:jpn
Schlagworte:
Aerial photographs
Aerial photography
Beach erosion
Beach nourishment
Beaches
BG model
Canyons
Coastal erosion
Coasts
Investigations
Kozu and Maekawa coasts
Offshore
River mouth
River mouths
Rivers
shoreline changes
Shorelines
submarine canyon
Submarine canyons
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Zusammenfassung:A large submarine canyon is located offshore of the Morito River mouth 2.5 km east of the Sakawa River, and an embayment surrounded by a steep slope approaches the shoreline. Severe beach erosion occurred on the Kozu and Maekawa coasts behind this submarine canyon. The shoreline changes of these coasts between 2009 and 2020 were investigated using aerial photographs as well as the investigation on change in longitudinal profiles. Furthermore, beach changes were reproduced using the BG model and the effect of beach nourishment was investigated. It was found that beach nourishment of 2×104 and 0.8×104 m3/yr are required on the Kozu and Maekawa coasts, respectively, to maintain these coasts.
ISSN:2185-4688
DOI:10.2208/jscejoe.77.2_I_835