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- 저자 : 남선우 ( Nahm Sun Woo ) (검색결과 5 건)
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김채수 ( Kim Chae Soo ),남선우 ( Nahm Sun Woo ) 한국농공학회 1988 韓國農工學會誌 : 전원과 자원 Vol.30 No.4
This study was aimed at determining a regime of flow through rubble mound dike consisted of all sized quarrystons, and deriving a relationship between hydraulic gradient (I) and mean flow velocity (V) through the dike. The analysis was carried out with the data observed after final gap closing of the Haenam Sea dike from May, 6 to May, 14, 1987. The results are summarized as follows: 1. The regime of flow would be defined as the turbulent flow. 2. As to the relationships, two kinds of formula that are exponential and binomial were obtained. Exponential formula: I=2.099V <sup>1.2888</sup> Binomial formula: I=0.6113V+5.5235V<sup>2</sup> 3. Correlation coefficient of the former was 0.824 and that of the latter was 0.821, and the deviations between observed data and estimated were 0.0070 and 0.0064 respectively. 4. Comparing the correlation coefficient, both the equations have the same correlation coefficients, but in case of the deviation the binomial equation was better than the exponential equation. Therefore, the binomial equation is proposed for analyzing the flow through rubble mound dike.
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南宣祐 東國大學校 1976 論文集 Vol.15 No.-
This Study is tried to simplify the computation of the water surface profile by using the non-uniform steady flow equation. The equation of this flow is solved by the Runge-Kutter method which used to the ordinary differential equation, and boundary problem is solved by Lagrange's interpolation method. The graphical method by Escoffier for tracing the water surface profile is evaluated in the practical river channel. The flow chart and FORTRAN program are designed for both the initial and the boundary condition problems for the non-uniform steady flow. In order to test this program, the data of the upstream of Paldang dam site of the Han River is used and computed. This proposed method, which is conveniently applicable to the practice, has been found to be especially advantageous, when several water profiles must be determined to be compared; and when the results must be known in a short time.
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남선우,최은호,강상진,이환대 동국대학교 대학원 1993 大學院硏究論集-東國大學校 大學院 Vol.23 No.-
Stepwise multiple regression methods with ordinary least square analysis and ridge regression analysis are used to select the optimum hydrometeorological data and to derive a model for areal evapotranspiration estimation. The ridge regression analysis ithbiased estimators is adapted to overcome the multicollinearity exists among the independents variables and to minimize the variance of data. A model based on two variables of precipitation and air temperature, derived from linear and ridge regression analysis, can provide a quite satisfactory estimation of the evapotranspiration in Pyungchang river basin which is one of the IHP representitive basins in Korea. In the to variables case the linear regression model have similar results to ridge regression model. But in the nine variables case the improved results are represented by the ridge regression than linear multiple regression.
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南宣祐,崔銀鎬 東國大學校 1988 論文集 Vol.27 No.-
The aim of this study is to develop a model to estimate and to predict the losses during unsteady rainfall on forest watersheds. The formulated model has three hydrologic components which are infiltration, evapotranspiration, and interception and retention storage. In this paper the modified Green-Ampt equation was applied to determine the time when surface ponding starts and to compute the infiltration rate after ponding time. Morton's model was used to estimate the evapotranpiration rate during rainfall events. The USBR(1973) proposed the retention rate that is associated with the hydrologic soil groups which are classified by the U.S. Soil Conservation Service. The retention rate was used to verify the lag time of run off. The loss rates model was derived from 7 unsteady rainfall events in Jangpyung watershed, which is one of the representitive watersheds of the International Hydrological Program (IHP, from UNESCO) and is located in Pyungchang River Basin. The derived loss rates model is good agreement in predicting the time of runoff and runoff rate with the comparable measured ones.
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