인공어초 소실 메커니즘 분석 및 해저지반 지지력 간편 산정 방법에 관한 연구 = A Study on the Mechanism of Artificial Reef Loss and a Simplified Method for Estimating Bearing Capacity of Seabed Soils

다국어 초록 (Multilingual Abstract)

Artificial reefs have been widely deployed along Korea’s coast for ecosystem restoration and fisheries enhancement, but many have failed due to interactions with soft seabeds leading to settlement, scour, and burial. These failures occur especially on fine-grained silt-clay substrates even under low currents, whereas sandy seabeds experience scour only at higher flow speeds. Current site selection criteria rely on qualitative indicators(e.g., sediment type) and lack a clear quantitative method to evaluate seabed bearing capacity, making it difficult to predict and prevent long-term reef failure on weak ground. In this study, the mechanism of artificial reef loss was identified, and a simplified method for estimating seabed bearing capacity was proposed, thereby presenting a new approach to site suitability assessment and stability evaluation of artificial reefs. First, cases of artificial reef installation and loss nationwide were classified by soil type, and the correlation between loss types(scour, settlement, sediment transport) and geotechnical characteristics was investigated. Second, a field survey was conducted using a Multi-Beam Echo Sounder(MBES) and Side Scan Sonar(SSS) to investigate the causes of artificial reef loss in the coastal waters of Gochang-gun, Jeollabuk-do, and the results were analyzed. Third, to clarify the flow–scour mechanism according to seabed characteristics in reef loss areas, two-dimensional flume experiments were conducted using samples collected from the Gochang coastal waters. Based on numerical analyses, an empirical equation was proposed to estimate scour depth using only grain size characteristics, and the proposed equation was validated through laboratory tests, showing a high correlation with R² = 0.93. Finally, based on both laboratory experiments and field survey results, a simplified method and conceptual measuring device were proposed for estimating seabed bearing capacity in situ.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구배경 및 목적 1
• 1.2 연구내용 및 구성 6
• 제 2 장 연구동향 및 사례조사 8
• 2.1 인공어초 소실 유형 및 메커니즘 8
• 2.1.1 세굴 메커니즘 연구동향 8
• 2.1.2 침하 메커니즘 연구동향 12
• 2.1.3 퇴적물 이동 메커니즘 연구동향 16
• 2.1.4 지반지지력 산정 연구동향 17
• 2.2 국내외 인공어초 소실 연구 한계 20
• 제 3 장 인공어초 소실 DB분석 및 현장조사 22
• 3.1 국내 인공어초 설치 및 소실 현황 22
• 3.2 소실 유형과 지반공학적 특성 상관분석 25
• 3.3 고창군 인공어초 소실 사례 26
• 3.3.1 재료 및 방법 28
• 3.3.2 해저 지형변화 분석을 통한 어초 소실원인 진단 49
• 제 4 장 실내실험을 통한 세굴 발생 특성 연구 59
• 4.1 재료 및 방법 59
• 4.1.1 시료채취 및 입도분석 59
• 4.1.2 2차원 흐름 수조 실험 63
• 4.2 임계 유속 산정 및 세굴 깊이 분석 66
• 4.2.1 세굴-유속 관계 분석 66
• 4.2.2 인공어초 기울어짐 현상 78
• 4.3 세굴 깊이 추정식 제안 86
• 4.3.1 수치 시뮬레이션 86
• 제 5 장 세굴 취약지역 지반지지력 간편 산정방법 제안 97
• 5.1 기존 지반지지력 추정 방법 한계 97
• 5.2 지반지지력 간편산정 방법 제안 106
• 5.2.1 (추정법) 해저 지반지지력 추정 방법 106
• 5.2.2 (측정법) 해저 지반지지력 측정기기 111
• 제 6 장 결론 및 추후 연구과제 139
• 6.1 결론 139
• 6.2 추후 연구과제 143
• 참고문헌 145