鎌倉海岸七里ヶ浜地区での侵食機構の解析と対策案の検討

宇多 高明; 田村 貴久; 小金 宏秋; 大谷 靖郎; 三波 俊郎; 伊達 文美

doi:10.2208/jscejoe.77.2_I_823

Annual Journal of Civil Engineering in the Ocean Vol.37

ANALYSIS OF BEACH EROSION OF SHICHIRIGA-HAMA BEACH IN KAMAKURA CITY AND MEASURES

Takaaki UDA, Takahisa TAMURA, Hiroaki KOGANE, Yasuro OHTANI, Toshiro SAN-NAMI, Ayami DATE

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Keywords: Shichirigahama Beach, beach erosion, aerial photograph, shoreline changes, longshore sand transport, Point Inamuragasaki

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2021 Volume 77 Issue 2 Pages I_823-I_828

DOI https://doi.org/10.2208/jscejoe.77.2_I_823

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Abstract

Beach changes between 2009 and 2019 of Shichiriga-hama Beach in Kamakura City were investigated using aerial photographs and the beach changes were reproduced using the BG model. It was found that erosion of this beach was possibly caused by the discharge of sand at a rate of 4,000 m³/yr turning around Point Inamuragasaki under the oblique wave incidence from southwest. The effect of beach nourishment was studied to maintain the beach, and the amount of beach nourishment neccesary for the recovery of sand beach was 1.0×10⁴ m³/yr.

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