數値模型을 이용한 貯水池내 堆砂 거동에 관한 硏究 = Analysis on Behavior of Sediment Deposition in a Reservoir using a Numerical model

다국어 초록 (Multilingual Abstract)

Sediment deposition can bring about some serious problems such as storage capacity reduce in a reservoir, lifespan shortening of a reservoir, and water supply difficulty. In a natural stream, quicksand is interfered with by the flooding defense structures like dams. Also, quicksand can affect the river bed change of the downstream by the discharge of a dam.
The river bed change by the sediment deposition in a reservoir is influenced by many factors : the size and shape of sediment particle, the seasonal change of flow rate and quicksand amount, reservoir size and shape, and the discharge amount of a reservoir in a flood season. This means that the prediction of the sediment distribution and amount in a reservoir using a proper numerical model is necessary for the reasonable and efficient management of a river and a reservoir.
For the mean time, the sediment amount was estimated by the empirical formulae for the estimation of dam construction cost in the stage of preliminary study and basic design. However, the variation of the sediment amount calculated by the empirical formulae is large because the empirical formulae can be easily affected by the reliability of basic data and restriction of parameters. Therefore, when choosing the formula appropriate for the basin and reservoir, it is needed to consider all of these conditions.
In this study, the sediment movement in the Bu-hang multi-purpose dam was investigated using SMS(Surface-water Modeling System) of 2-dimensional numerical model, and also estimated the considerations for the site selection of a structure in the reservoir based on the results of sediment distribution.
Through the simulation, it is founded that in the reservoir, whose flow velocity distribution is not various, the gravel and large sized sand is easily deposited at the inlet of the reservoir under the flood condition. As far from the inlet of the reservoir, the sediment amount is reduced drastically and sediment deposition does not occur. In the reservoir of Bu-hang, the depth of sediment deposition is estimated as 0.002～0.047m from the inlet to the site of 1.8km apart from the inlet of the reservoir. The delta deposition pattern in the inlet of the reservoir also could be simulated.
Until now, the sediment amount data which is measured actually in a reservoir is not sufficient in korea. Therefore it is needed to accumulate the sediment amount data by the periodic survey in dams. Based on these actually measured data and numerical model, which can predict the spatial distribution of sediment, the more studies should be conducted to estimate the influence of the sediment movement properties on the structure in the reservoir more precisely.

목차 (Table of Contents)

• 제1장 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 2
• 1.3 연구 범위 3
• 제2장 국내외 연구동향 4
• 제3장 모형 선정 7
• 3.1 저수지 퇴사 유형 7
• 3.2 실측에 의한 방법 12
• 3.3 경험적 방법 12
• 3.4 모형에 의한 방법 16
• 제4장 적용 모형의 배경 이론 19
• 4.1 개요 19
• 4.2 SMS 모형 19
• 제5장 대상유역 개관 33
• 5.1 유역 특성 33
• 5.2 수리·수문 특성 34
• 5.3 저수지 퇴사 예측 39
• 제6장 모형 적용 및 결과 42
• 6.1 RMA-2 모형 적용 42
• 6.2 SED-2D 모형 적용 46
• 제7장 결론 및 향후과제 59
• 7.1 결론 59
• 7.2 향후과제 60
• 참고문헌 61
• ABSTRACT 66
• 감사의 글 69