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RISS 인기검색어
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- 저자 : 차상화 (검색결과 27 건)
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차상화,박기범 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3
in this study analyzed the reliability indices against the water supply ability of Andong dam. The water supply analysis of Andong dam used the HEC-5 model. So Andong dam simulated planed water-supply capacity of Andong dam as increase and decrease +5%~5% of water supply quantity. Water-supply capacity of Andong dam estimated, deficit occurrence, deficit quantity, deficit period. As the results estimated reliability(occurrence based, time based, quantity based) and resiliency vulnerability and with water supply capacity evaluation indices of Andong dam. Also reliability(occurrence based, time based, quantity based). resiliency, vulnerability and resiliency indices are estimated to evaluated the performance of water supply on Andong dam, and their relationships are evaluated.
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최적화기법에 의한 농업용 저수지의 관개면적별 최적용수관리
차상화 한국환경과학회 2003 한국환경과학회지 Vol.12 No.4
In this paper, the study area is selected Sungju Reservoir which was constructed with an agricultural purpose and determined the optimal water management plan among the five cases of classified irrigation area by using Linear Programming. As a results of reservoir operation, the additional water quantity of classified irrigation area showed 16.036×10^6㎥/year, 19.404×10^6㎥/year, 18.864×100^6㎥/year, 4.032×10^6㎥/year and 0.672×10^6㎥/year and the total water supply quantity showed 69.628×10^6㎥/year, 70.048×10^6㎥/year, 67.979×10^6㎥/year, 67.979×10^6㎥/year, and 69.939×10^6㎥/year respectively. Therefore, the case-Ⅱ was adopted with water management plan of optimum. It is also known that the maximum irrigation area augmentation effect appears in the case which will use the additional water quantity in field irrigation of the case-Ⅱ which was adopted.
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신뢰성 기준을 적용한 용수공급능력의 해석 : 낙동강유역을 중심으로 for the Nakdong River Basin
차상화,지홍기,이순탁 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12
In general, the evaluation of water supply capacity is important factor to establish various establishment of water resource supply plan include water resource security and determination of dam's mass. But former researchs about estimation of water supply capacity were lack in continunity of evaluation basis, and didn't excute analysis on reliability criteria also. In this study, Nakdong river was selected for study basin, and then water supply capacity was analyzed by HEC-5 model using indentical reliability criteria.
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수치고도모형을 이용한 본류하천길이에 관한 프랙탈 차원의 해석
차상화 한국환경과학회 2002 한국환경과학회지 Vol.11 No.9
본 연구는 DEM을 활용하여 하천유역에 있어서 본류하천길이에 대한 프랙탈 특성을 분석하는데 목적을 두고 분석을 실시하였다. 따라서 본 연구에서는 GIS를 이용하여 대상유역의 DEM을 구축한 후 축척별 및 격자 크기별로 본류하천길이를 추출하였으며, 여기서 추출된 하천길이와 축척률 및 격자크기와의 상관분석을 통하여 각 유역별 프랙탈 차원과 상관계수를 산정하였다. 프랙탈 차원의 산정결과 1.028로 나타나 본류하천길이는 격자크기의 변화에 상당한 영향을 받는 것으로 분석되었다. 따라서 DEM을 이용하여 하천유역의 수문환경, 유사량 및 홍수유출량을 산정할 경우에는 격자크기 및 축척률이 결과에 큰 영향을 미치는 것으로 나타났다. Recently, GIS(Geographic Information System) is used to extract various hydrological factors from DEM(Digital Elevation Model) in river basin. Therefore, this study aims at the determination of river fractal dimension using DEM. In this paper, the main-stream length in river basin was grid-analyzed for each scale(1/5,000, 1/25,000, 1/50,000) and each cell size(5m×5m, l0m×10m, 20m×20m, 30m×30m, 40m×40m, 50m×50m, 60m×60m, 70m×70m, 80m×80m, 90m×90m, 100m×100m, 120m×l20m, 150m×150m) using GIS. Also, fractal dimension was derived by analyzing correlation among main-stream lengths, scale, and cell size which were calculated here. The result of calculating fractal dimension for each cell size shows that the fractal dimension on the main-stream length is 1.028.
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차상화,이순탁 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2
A new rainfall-runoff model(GIS-SUH) was developed to apply to a river basin by considering the calculated fractal dimension. The SUH model was developed by analyzing correlation among rainfall, discharge and topographical factors in Nakdong river basin. The GIS-SUH model was developed by using fractal dimension which was calculated in Wi stream basin. The SUH model and the GIS-SUH model were applied to Wi stream which is representative experimental river basin of IHP and were verified its sensibility. The result of analyzing sensibility by applying the SUH model and the GIS-SUH model to a real river basin showed that the GIS-SUH model simulates the runoff phenomenon more exactly than the SUH model.
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차상화,이순탁 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2
This study analyzed fractal characteristics of river by using GIS. In this study, topographical factors in river basin was grid-analyzed for each cell size by using GIS and regression formula was derived by analyzing correlation among topographical factors and cell size which were calculated here. And, analysis of fractal characteristics of river by using the result calculated from 1) showed that among topographical factors, rover length only increases according as cell size increases. The result of calculating fractal dimension for each cell size shows that river length, basin area, and centroidal flow path are 1.028, 1.0026 and 1.0061 respectively.
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차상화 ( Cha Sang Hwa ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.6
This study was performed to analyze the river fractal characteristics using GIS (Geographic Information System). In this study, topographical factors in river basin were grid-analyzed for each cell size and scale using GIS and regression formula was derived by analyzing correlation among topographical factors and cell size which were calculated here. And, a new rainfall-runoff model which is considering the calculated fractal dimension was developed to apply for a river basin.
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차상화(Sang Hwa Cha),권기욱(Kee Wook Kwon) 한국지리정보학회 2001 한국지리정보학회지 Vol.4 No.4
This study analyzed fractal characteristics of river basin by using GIS. In this study, topographical factors in river basin was grid-analyzed for each cell size by using GIS and regression formula was derived by analyzing correlation among topographical factors and cell size which were calculated here. And, analysis of fractal characteristics of river by using the result calculated from 1) showed that among topographical factors, river length only increases according as cell size increases. The result of calculating fractal dimension for each cell size shows that river length, basin area, and centroidal flow path are 1.028, 1.0026 and 1.0061 respectively.
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박기범,김교식,차상화,안승섭 한국방재학회 2015 한국방재학회 학술발표대회논문집 Vol.14 No.-
최근 증가하는 강우강도와 강우량으로 인해 건설된 지 수십년이 지난 소규모 농업용 저류지는 과거 건설당시의 설계빈도와 비교하여 현재의 기준과 비교하면 안정성이 확연히 낮아지고 있다. 이러한 노후되고 안정성에 문제가 있는 전국의 약 17,531여개의 소규모 농업용 댐과 저수지는 현재의 강화된 설계기준으로 재검토가 필요하며, 치수능력의 증대방안으로 여수로 및 수문을 보강할 필요가 있다. 최근들어 발생하는 저수지의 붕괴사고가 이러한 노후된 저수지의 안전성을 평가하고 저수지의 치수능력을 증대시켜야 할 필요성을 강조하고 있다. 본 연구에서는 소규모 농업용 저수지유역의 강우분석을 실시하여 200년 빈도의 120%증대된 기준으로 현재의 저수지의 안전성을 평가하여 부족한 치수능력을 증대시키기 위한 저수지 증고, 여수로 증설 및 수문 설치방안 등을 검토하였다. 이러한 치수능력을 증대하여 기존의 저수지의 안정성을 확보하고 하류지역의 홍수에 대한 안정성을 확보 할 수 있을 것으로 판단된다. 이러한 기준으로 농업용 저수지의 치수능력을 평가하여 전국에 산재된 수많은 농업용 저수지의 치수능력을 증대함으로 인해 지방하천, 대하천 유역의 홍수저감 효과를 증대시키고 저수지 하류의 안전을 확보하고자 한다.
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