초록

□ 3차원 유동해석 모형 구축을 위한 난류모형 및 해석 알고리즘 조사
□ 3차원 유동해석 모형을 구축 및 검증
□ 구축된 모형을 활용 보 하류 유동 특성 파악
□ 이상흐름 모형을 이용하여 세굴예측모형 개발
□ 침강 및 붕괴 사례에 적용하여 모형의 적용성 검토
□ 보 하류 세굴 현상 모의 및 검토
□ 물받이 길이, 수문 개방, 하류 수심, 방류 유속등의 의한 세굴심 검토
□ 모의 결과를 바탕으로 보 하류 하도 안정성 검토

(출처 : 요약서 3p)

Abstract ▼

□ Purpose & Contents
Construction of hydraulic structures crossing the stream channel interrupts sediment supply in the downstream reach of the structure. It was reported that the 16 weirs, which were constructed during the 4 Major River Project in Korea,have caused scour problems in the downstre

□ Purpose & Contents
Construction of hydraulic structures crossing the stream channel interrupts sediment supply in the downstream reach of the structure. It was reported that the 16 weirs, which were constructed during the 4 Major River Project in Korea,have caused scour problems in the downstream reach of the weirs. This problem increased concerns over the function and safety of the weirs. As increasing concerns over the stream environment and the function and safety of the weirs,an engineering tool, which is possible to simulate scours and to establish the management strategy, was required. The objective of this project is to develop a 3D numerical model that is able to simulate local scour at the downstream reach of the weir. The specific objectives include the development of a 3D flow model for simulating the turbulent flow and local scour and a technique for assessing the stream channel stability using developed models.
In the first year, an appropriate turbulence model for computing local scour downstream of the weir is suggested. An algorithm for the hydrodynamic simulation is devised, and the numerical model is developed. The developed numerical model is applied to the field-scale case for the verification. In the second year, the integrated model is presented by combining the flow model with the scour prediction model. Using the integrated model, local scour downstream of the weir is predicted, and a methodology for evaluating the safety of the weir and stream channel stability is presented. The stability of the stream channel downstream of the weir is investigated for the various discharges, and structural and non-structural measures are suggested for the safety of the weir and the stability of the downstream channel.

□ Results
Main outcomes from the present research project include the development of the 3D numerical model which is able to predict local scour downstream of the weir and the suggestion of a methodology which is able to evaluate channel stability using the developed numerical model. The integrated model, which is a combination of a 3D flow model and a sediment transport model, can predict local scour in the downstream of the weir precisely. Using the developed model, local scour downstream of the weir is predicted for the various discharges and an evaluation methodology for the stability of the downstream channel is established.

□ Expected Contribution
Using the integrated model, local scour downstream of the weir can be predicted for the various discharges and the impact of scour on the channel stability in the downstream reach of the weir can be examined. The results from numerical simulations can be used to establish the management direction for the maintenance of the function of the weir. The numerical model can also be used before the construction stage to establish a plan for reducing the impact of hydraulic installations. It can be also used to find out the degree of impacts on the stream channel stability. In addition, the flood control ability can be improved and efficient sediment management is expected using the precise prediction of the sediment discharge and local scour in the downstream reach of the weir.

In the technological aspect, the integrated model is expected to provide an advanced technique for predicting local scour downstream of the weir. The safety of the weir from flash floods would be enhanced, and the maintenance strategy of the weir would be upgraded. In the aspects of economy and industry, damages from the flood disaster can be decreased, while benefits from the operation of hydraulic installations can be increased. Moreover, the damages from flash floods due to the climate change can be reduced. In the social aspect, improvedsafety of hydraulic installations can also contribute to the maintenance of the amenity values of the stream and the improvement of negative opinion for the river works.

(출처 : SUMMARY 5p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요약문 ... 4
• SUMMARY ... 5
• Contents ... 6
• 목차 ... 7
• 제1장. 연구개발과제의 개요 ... 8
• 1. 연구개발의 배경 ... 8
• 2. 연구개발의 필요성 ... 9
• 3. 연구개발의 중요성 ... 10
• 4. 연구개발의 목표 ... 11
• 5. 연구개발의 창의성·혁신성 등 ... 13
• 제2장. 국내외 기술 개발 현황 ... 14
• 1. 국내 기술개발 현황 ... 14
• 2. 국외 기술개발 현황 ... 14
• 3. 기존 연구와의 차별성 ... 16
• 제3장. 연구수행 내용 및 성과 ... 19
• 1. 연구수행 체계도 및 일정 ... 19
• 2. 유동해석 모형 구축 ... 21
• 2.1 유동방정식 ... 21
• 2.2 유동 해석 알고리즘 ... 25
• 2.3 경계조건 및 초기조건 ... 28
• 2.4 모형 적용 및 검증 ... 31
• 3. 세굴예측 통합 모형 구축 ... 52
• 3.1 이상 흐름 모형 (two-phase flow model)의 지배방정식 ... 52
• 3.2 모형의 적용 및 검증 ... 60
• 4. 보 하류 하도 안정성 평가 ... 79
• 4.1 안정성 평가기법 ... 79
• 4.2 안정성 평가 (예시) ... 80
• 제4장. 목표 달성도 및 관련 분야 기여도 ... 83
• 1. 목표 달성도 ... 83
• 2. 관련 분야 기여도 ... 83
• 제5장. 연구개발성과의 활용계획 ... 84
• 제6장. 연구 과정에서 수집한 해외 과학기술 정보 ... 85
• 제7장. 연구개발성과의 보안등급 ... 86
• 제8장. 국가과학기술종합정보시스템에 등록한 연구시설·장비 현황 ... 86
• 제9장. 연구개발과제 수행에 따른 연구실 등의 안전 조치 이행 실적 ... 86
• 제10장. 연구개발과제의 대표적 연구 실적 ... 89
• 제11장. 기타 사항 ... 89
• 제12장. 참고 문헌 ... 90
• 끝페이지 ... 94