구조물 설치에 따른 장단기 하상변동 예측

다국어 초록 (Multilingual Abstract)

Sediment transportation process has been active throughout geological time. Both the forest fire and the volcano-eruption can change the river bed due to the variation of sediment transportation. Since this only happens in rare cases, most of the engineers concern themselves to the bed changes causing by human activities like dredging in the water way and structure-construction in the river basin. In order to estimate the effect of these factors on river bed accurately, it is important to predict and analyse the river bed changes.
Recently, S. Korea is underway on the Four Major River Restoration Project to prepare for the climatic changes, plan symbiotic relationship between the nature and human, renew the country, balance each territories, and build a basis for the green growth. At the same time, due to the insufficiency of water for about 1 billion is expected by the year 2016, we have to insure the sufficient amount of water resource. Therefore, by installing the dredging and weirs in Han, Nakdong, Geum, Yeongsan rivers, we are trying to increase the sufficient amount of water for public use for up to 1.3 billion .
Among the rest, submerged weirs(Geumnam, Buyeo, Geumgang weirs) are planned to be installed newly in Geum river basin. Cases like Geumnam weir, Geumgang 1 Bridge and Geumgang 2 Bridge are under construction at its height where the expected place for the weir’s lower stream and the upper stream is located. So A huge change of the river bed is expected when five structures between 2.9km starting from Geumnam Bridge are completed.
Geumnam gauging station is installed in Geumnam bridge, which is one of many gauging stations installed in Geum River basin. If those structures make a huge change in river bed, Geumnam gauging station would no longer have the trustworthy in its accuracy.
To examine about the continue use of the Geumnam gauging station and be a basic data for structures-built in river area, in this study, river bed height variation due to the constructions of weir and bridges was simulated for short term prediction using 2D numerical model of SED-2D and for long term prediction using 1D numerical model of HEC-RAS.
As a result of the simulations, the bed elevation of the cross section where Geumnam Bridge layed on was turned to 8.63m in ten years in Case 2. It is 0.33m higher than the result simulated without new structures. The cross section, however, decreased 0.7m during ten years in Case 2 comparing with 0.11m in Case 1. Therefore, the measurements need alternative solutions in the future, like updating the stage-discharge relation curve.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 2
• 1.3 연구 내용 2
• 1.4 연구 범위 4
• 제 2 장 국내외 연구동향 5
• 2.1 국외 연구동향 5
• 2.2 국내 연구동향 6
• 제 3 장 적용모형 선정 및 모형의 이론적 배경 9
• 3.1 적용모형 선정 9
• 3.2 SMS 모형의 이론적 배경 11
• 3.2.1 모형의 소개 11
• 3.2.2 모형의 구성 11
• 3.2.3 기본이론 11
• 3.3 HEC-RAS 모형의 이론적 배경 18
• 3.3.1 모형의 소개 18
• 3.3.2 하상변동 이론 18
• 3.3.3 지배방정식 19
• 제 4 장 대상유역 및 입력자료 21
• 4.1 대상 유역 개요 21
• 4.1.1 금강 유역 개황 21
• 4.1.2 하도 특성 자료 25
• 4.1.3 대상구간 구조물 현황 27
• 4.1.4 대상구간 내 수위관측소 33
• 4.2 2차원 단기 하상변동 모의를 위한 구축 자료 34
• 4.2.1 지형자료 구축 34
• 4.2.2 RMA-2 입력자료 36
• 4.2.3 SED-2D 입력자료 39
• 4.3 1차원 장기 하상변동 모의를 위한 구축 자료 44
• 4.3.1 수리량 자료 44
• 4.3.2 유사량 자료 47
• 제 5 장 2차원 수치모형의 적용 결과 및 분석 53
• 5.1 HEC-RAS 모형 결과와의 비교 53
• 5.2 RMA-2 모의 결과 및 분석 54
• 5.2.1 수위의 변화 54
• 5.2.2 유속의 변화 60
• 5.3 SED-2D 모의 결과 및 분석 66
• 제 6 장 1차원 수치모형의 적용 결과 및 분석 75
• 6.1 HEC-RAS 모형의 검증 75
• 6.2 HEC-RAS 모의 결과 및 분석 77
• 제 7 장 결론 84
• 참고문헌 86
• Abstract 93