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류경식 ( Ryoo Kyong-sik ),이순혁 ( Lee Soon-hyuk ),황만하 ( Hwang Man-ha ),이상진 ( Lee Sang-jin ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
The objective of this study is to check into variation trends of design rainfall according to change of the number of years for observed data. To make comparative study of the relation between design rainfall and recorded year, this study was used maximum rainfall for 24-hr consecutive duration at Gangneung, Seoul, Incheon, Chupungnyeong, Pohang, Daegu, Jeonju, Ulsan, Gwangju, Busan, Mokpo and Yeosu rainfall stations. The tests for Independence, Homogeneity and detection of outliers were used Wald-Wolfowitz's test, Mann-Whitney's test and Grubbs and Beck test respectively. To select appopriate distribution, the distribution of genaralized pareto(GPA), generalized extreme value(GEV), generalized logistic(GLO), lognormal and pearson type 3 distribution is judged by L-moment ratio diagram and Kolmogorov-Smirnov (K-S) test. Design rainfall was estimated by at-site frequency analysis using L-moments and Generalized extreme value(GEV) distribution according to change of the number of years for observed data. Through the comparative analysis for design rainfall induced by L-moments and GEV distribution, relationship between design rainfall and recorded year is provided.
류경식 ( Kyong Sik Ryoo ),이순혁 ( Soon Hyuk Lee ),황만하 ( Man Ha Hwang ),고익환 ( Ick Hwan Ko ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
This study is to derive the design floods by optimal distribution using the L-moment method. Parameters for the applied distributions were estimated by the L-moment for the annual flood flows of the each watersheds. Design floods obtained by the applied distributions were compared by the relative mean errors, relative absolute errors and root mean square errors. Results show that the optimal distributions for the each watersheds are that Soyang and Andong watersheds are Log-pearson type 3; Chungju watershed is Generalized Logistic; Namgang watershed is Generalized Pareto; Daecheong watershed is Gumbel; and Seomjin is Generalized Extreme Value.
류경식 ( Kyong Sik Ryoo ),황만하 ( Man Ha Hwang ),이상진 ( Sang Jin Lee ),정우창 ( Woo Chang Jeong ),이배성 ( Bae Sung Lee ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
This study is for analysis of both the runoff attribute and the water accounting related in the water management. RRFS modelling with runoff attribute analysis was used to calculate naturalized streamflow at each sub-basin of the Daecheong Dam basin. Analysis of both the runoff attribute and the WAI(Water Accounting Index) was performed by monthly, yearly and basin in the Daecheong dam basin. Results show that base flow from direct flow concentrated in two month(July to August) is influenced in four month(July to October) and water use is unstable while the initial agricultural water(May) is supplied.
류경식 ( Ryoo Kyong-sik ),황만하 ( Hwang Man-ha ) 한국농공학회 2007 한국농공학회논문집 Vol.49 No.3
In general method to estimate the water supplies in the large-scale basin, indirect estimation method such as unit loading factor method has been used. However, the estimated water supplies are much different to the real water supplies used in the any basin because these general methods estimate them considering water supply demands only. Especially, water supplies for irrigation are big different to the real water supplies in which the water supplies for irrigation are depend on the weather conditions such as evaporation, basin conditions such as infiltration, the reservoir operation rule for irrigation water, and distribution methods. Thus, a new estimation method is developed to estimate the real water demands which is essential factors for the effective water resources operation in the basin. This method is for estimating the water supplies and return rates based on the survey of the irrigation reservoirs and the analysis of effects to the stream flows, return flows, and water supplies for irrigation which water supplies and return rates are used in the basin water management model. The water supply usages in each subbasin are validated by comparisons between the simulated discharges from the basin water management model and the discharges measured in the control points.
류경식 ( Ryoo Kyong Sik ),황만하 ( Hwang Man Ha ),이상진 ( Lee Sang Jin ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
In general method to estimate the water supplies in the large-scale basin, indirect estimation method such as unit loading factor method has been used. However, the estimated water supplies are much different to the real water supplies used in the any basin because these general methods estimate them considering water supply demands only. Especially, water supplies for irrigation are big different to the real water supplies in which the water supplies for irrigation are depend on the weather conditions such as evaporation, basin conditions such as infiltration, the reservoir operation rule for irrigation water, and distribution methods. Thus, a new estimation method is developed to estimate the real water demands which is essential factors for the effective water resources operation in the basin. This method is for estimating the water supplies and return rates based on the survey of the irrigation reservoirs and the analysis of effects to the stream flows, return flows, and water supplies for irrigation which water supplies and return rates are used in the basin water management model. The water supply usages in each subbasin are validated by comparisons between the simulated discharges from the basin water management model and the discharges measured in the control points.
Log-Pearson Type III 및 GEV분포모형에 의한 강우의 지점 및 지역빈도 비교분석
류경식 ( Ryoo Kyong Sik ),이순혁 ( Lee Soon Hyunk ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
This study was conducted to draw design rainfall for the regional design rainfall derived by the optimal distribution and method of frequency analysis. The design rainfalls were calculated by the regional and at-site analysis for Log-Pearson type III and GEV distributions and were compared with Relative efficiency(RE) which is ratio of Relative root-mean-square error (RRMSE) by the regional and at-site analysis for Log-Pearson type III and GEV distributions. Consequently, optimal design rainfalls following the regions and consecutive durations were derived by the regional frequency analysis for GEV distribution and design rainfall maps were drawn by GIS techniques.
류경식 ( Ryoo Kyong-sik ),이순혁 ( Lee Soon-hyuk ),맹승진 ( Maeng Sung-jin ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
모든 수공구조물은 재현기간에 따른 설계홍수량에 맞춰 설계하지만 이는 설계재현기간동안 예상된 설계홍수량보다 큰 홍수량이 발생할 수 있는 위험을 항상 내포하고 있다. 이와같은 위험성을 제거하기 위하여 설계재현기간에 따른 예상설계홍수량을 초과할 위험을 수치화하여 각 위험도에 맞는 설계홍수량을 제시하는 것이 무엇보다도 중요하다. 이에 본 연구에서는 우리나라 대표수계인 한강, 낙동강, 영산강, 섬진강의 7개 유역에 대한 연최대 홍수량을 사용하여 이들 자료에 대한 신뢰도를 판정하고, K-S test에 의해 GEV분포모형과 Gamma분포모형의 적합도를 검정한 후 L-모멘트법에 의해 각 분포형의 매개변수를 구하였고, L-모멘트법에 따른 설계흥수량을 유도하였다. 또한, 유도된 설계홍수량과 플로팅포지션법을 달리하여 비교분석한 후, 적정한 것으로 판단된 GEV분포모형에 대한 설계홍수량의 위험도 수준별 및 빈도별 홍수량을 유도하였다. 또한, 위험도를 고려치 않은 현존 빈도별 설계홍수량은 수공구조물의 안정성에 심대한 영향을 미칠 수 있으므로 수준별 위험도를 고려한 설계홍수량의 유도와 함께 위험도의 수준을 사회경제적인 측면을 고려하여 이에 맞게 설계홍수량을 결정함이 바람직할 것으로 고찰되었다. The purpose of this study is to derive design floods by the risk levels. Seven watersheds were selected for the application from Han, Nagdong, Yeongsan and Seomjin rivers. The tests for Independence, Homogeneity and detection of outliers were used Wald-Wolfowitz’s test, Mann-Whitney's test and Grubbs and Beck test respectively. The test of goodness of fit for the applied probability distribution was performed by Kolmogorov-Smirnov test. Comparative analysis of design floods was carried out between GEV and Gamma distributions. Consequently, Design floods were derived by the risk levels using GEV distribution.