海岸護岸・堤防裏込め土砂の空洞化に関する実態調査 : 高知県吉川, 赤岡及び岸本海岸について

概要

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Damages of coastal dikes and seawalls are almost caused subsequently to scour in the toe and to suck out in back-filling soil and sand. Coastal dikes and seawalls protect the land from wave action by the concrete wall and back-fill. Development of the caves in back-fill reduces the stability of dikes and seawalls. It is, therefore, important to know actual conditions of the caves. This report researches about actual conditions of the caves in back-fill of dikes, and seawalls along Yoshikawa, Akaoka, Kishimoto Coast, about 4.4 km east from the Monobe river in Kochi prefecture. It was confirmed that the caves have a developing tendency, when the width of the beach in front of seawalls is narrow and their foundations are exposed. The depth of the largest cave in the investigated ones is about 4.4 m. The seawall that includes this cave will be easily destroyed by wave pressure.
日本自然災害学会の論文
1990-03-31