A new wave reduction method, called the Net Buffer Method, has been developed by the authors to reduce caisson joint waves for suppressing internal erosion and collapse behind seawalls and quaywalls. This new method, in which a net fiber material is installed within the joints, is capable of reducing caisson joint waves by more than 80% in terms of the maximum and average wave pressures. This study investigated the applicability of this method as a preventive maintenance and recurrence prevention measure against coastal internal erosion and collapse based on field observations. The results of analysis of the measured caisson joint wave pressures during the passage of three typhoons and a seven-year follow-up survey show the effectiveness of this method as a preventive maintenance and in preventing re-collapse under severer wave conditions than those that led to collapse in the past.

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