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- W1974557488 abstract "본 연구에서는 하상의 시공간적변동에 대한 평가기법을 개발하고자, 1차원HEC-RAS 모델과 2차원CCHE2D 모델을 이용해 하상변동을 평가하였다. 실제하천의 장기간 하상변동의 결과를 해석함에 있어서 변동 특성을 일관적인 기준으로 평가하고, 변화량을 직관적으로 알 수있는 평가방법을개발하고자유사단면누가곡선, 유사단면모멘트, 유사확률분포함수의 세 가지 평가 방법을 개발하였다. 본 연구를 수행한 결과 유사단면 누가곡선법은 단면의 총량적 개념의 침식 또는 퇴적 여부를 판별하는데 효과적이며, 유사단면 모멘트법은 하천의 좌, 우안을 나누는 기준선을 중심으로 좌, 우안의 퇴적 또는 침식 정도를 하나의 척도로 제시하는 것이 가능하였다. 이러한 방법은 하천의 곡률 등과 연계한 하상변동 예측에 있어서 하나의 영향지표로 활용할 수 있을 것이다. 유사확률분포함수의 경우 하천 단면 구간에 대한 시간의 변화에 따른 변동 모의 결과를 직관적으로 도시하고, 해당 구간의 시공간적 변동 특성을 통계적 특성치인 평균과 신뢰 구간을 통해 정량화 할 수 있었다. In this study, to develop an assessment method for spatio-temporal riverbed changes, a 1-dimensional model (HEC-RAS) and a 2-dimensional model (CCHE2D) were built and applied. As for the analysis of a riverbed's long-term change in a real stream, three new assessment methods were developed, which are called the Sediment section cumulative curve, Sediment section moment, and Sediment probability distribution function. These methods were used to assess the characteristics of riverbed changes using a consistent valuation standard and to understand changes in quantities intuitively. From the results of this study, sediment characteristics of cross sections can be detected effectively by applying the Sediment section cumulative curve method to determine whether there is any sedimentation or erosion in total emission. The amount of sedimentation or erosion occurring in the right or left banks, which divided by center column, could be presented as one criterion by applying the Sediment section moment method. This approach could be utilized as an indicator for sediment predictions. Spatio-temporal sediment variables can be presented quantitatively by determining the mean and uncertain boundaries through the Sediment probability distribution function, and finally, the results can be illustrated for each cross section to provide intuitive recognition." @default.
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- W1974557488 date "2011-12-31" @default.
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- W1974557488 title "A Study on Development of Assessment Model for Spatio-Temporal Changes in River Bed Using Numerical Models" @default.
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- W1974557488 doi "https://doi.org/10.3741/jkwra.2011.44.12.975" @default.
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