BEACH EROSION OF SEISHO COAST DUE TO OFFSHORE DISCHARGE OF SAND TO DEEP OCEAN VIA SUBMARINE CANYON

DOI Web Site 4 References
  • UDA Takaaki
    （一財）土木研究センターなぎさ総合研究所 日本大学理工学部海洋建築工学科
  • SASAKI Nobumitsu
    神奈川県県土整備局河川下水道部砂防海岸課なぎさグループ
  • OHTANI Yasuro
    （一財）土木研究センター河川･海岸研究部
  • SAN-NAMI Toshiro
    海岸研究室（有）

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Other Title
  • 深海への土砂流出による西湘海岸の侵食

Abstract

<p> Beach erosion of the Seisho coast was investigated on the basis of shoreline analysis using aerial photographs. The hotspots of erosion of the coast were located on the Kozu and Maekawa coasts east of the Morito River mouth, and the area between Ninomiya IC of the Seisho Bypass and the Kuzu River mouth. The cause of the erosion on the Kozu and Maekawa coasts was due to the offshore discharge of sand via a submarine canyon offshore of the Morito River. In the latter case, sand has been transported away by eastward longshore sand transport. The entire volume of eroded sand was estimated to be 2.86×106 m3 between 1973 and 2020. Assuming that the entire volume of sand was transported into the submarine canyon, the rate of discharge was estimated to be 6.1×104 m3/yr.</p>

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