충주댐 수계의 환경조사에 관한 연구

김지학 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

In this study aims are researches of environment for the Chung ju dam. The Yungwal 1 and Youngwal 2 stage stations are researched flood flow and low flow during 3.2004~11.2004. They are observed water stages and flow velocities for flood and low flow. The observed data are used to derived rating curve and equations. Rating curve and equations are enclosed 2nd formulation and exponential equation formulation. For reliability verification, 7.11, 2004~7.20, 2004. flood event analysis and 11.1, 2003~10.31, 2004. daily flow analysis. Reliability analysis results are showed high reliability for the derived rating curves. Also, they are comparison with hec-ras model.

都市 流域의 尖頭洪水量 算定

金知學,許彰桓 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-

Numerous methods are available for estimating the peak flow required for design apllications in urban watersheds. Some incorporate the rainfall - runoff process, whereas others are completely empiric or correlative in that they predict peak flow by correlating the flow with simple drainage basin characterstic such as area or slpoe. In this study, the rational formula is identified as the most effective method of peak flow estimation for designing drainage facitities in urban watersheds.

지형학적 순간단위도를 이용한 산지소유역의 유출해석

金知學 충주대 2001 한국교통대학교 논문집 Vol.36 No.2

This study aims at the development of the geomorphological instantaneous unit hydrograph model(GIUH) for the rainfall-runoff analysis of the watershed which is ungaged or doesn't have sufficient hydrologic data.Rainfall-runoff analysis was performed in Wi stream(Dongkok station) which is a representative experimental river basin of IHP.In the process analysis of the GIUH model, GIUH model was applied the study basin and computed hydrographs by GIUH model was compared with observed hydrgraph.GIUH model shows closely to the observed hydrograph in the peak discharge of the hydrograph.As the results of analysis, it was found that GIUH model can be applied to an ungaged watersheds.

먹는물 관리법의 효율적 방안

김지학 충주대학교 학생생활연구소 1995 學生生活硏究 Vol.2 No.-

水資源의 意思決定論 適用에 關한 硏究(Ⅱ)

金知學 忠州大學校 1988 한국교통대학교 논문집 Vol.22 No.-

For effective operation plan of water resources in Nakdong river basin from Andong dam to the weir of the mouth of the river I studied the optimal decision making by applying decision theory to hydrology data of the dam, which will not only keep the regular water level but prevent flood damage. I researchel followings to determine the optimal operation plan of the water resources: 1. to establish water resource system of Nakdong river basin and goal function. 2. to make Bayesian decision and Non-Bayesian analysis of goal function. 3. to estabkish the optimal decision model and to make decision analysis of additional data. 4. to develop the optimal decision corresponding to the optimal model, and 5. to determine the optimal operation plan of the water resources in Nakdong river basin.

配水管網의 水理上 有利한 斷面設計에 關한 硏究

金知學 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2

The writer studied on the expressions of optimal water distribution pipe networks in water supply area and the methods of selecting economic pipe diameter in practical pipe networks. Then he clarified the theoretical foundation of practical program for economic design of large scale water destribution pipe networks. The results are as follows: 1) There are lots of factors related in the design of pipe networks and it is impossible for us to automatize the economic design including all of those factors. In practical design, however we can work out seperately minimizing the quantities of materials used under the relatively definite constraints like the range of pipe diameter and the maximum point of flow speed after geometric forms of pipe networks system are given. 2) The decision of geometric forms of pipe networks and the policy of choosing the main current pipe line have a great effect on the economy of pipe networks. 3) We must consider elastically to programize those policy modifications mentioned above through the practical demands and by devicing the forms and performance of applicable hand ware. 4) The equations (22) and (23) should be the expressions for which solve the relations between minimum pipe diameter and optimal pipe networks, and it must be considered the geographical slope, population density, and the road conditions etc. of the water supply area.

상관계수를 이용한 월별 유입량 예측에 관한 연구

김지학,박기범 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-

In this study is statistical analysis for the Chung Ju dam monthly inflow. The monthly inflow and precipitation correlation analysis results in 0.93. Also, Jan, Feb, Mar, Nov and Dec monthly inflow do not change or decrease but Jul, Aug, Sep and Oct monthly inflow are increase trend. In particularly Oct monthly inflow trend slope rise gradually, it is showed similar recent precipitation patterns. The results of auto-correlation coefficients are below 0.5 for the Chung Ju dam monthly inflow, so Chung Ju dam monthly inflow is not auto correlation. In this study indicated statistical analysis , Auto-correlation analysis and seasonal coefficients. It is necessary to build statistical and stochastic model.

선행강우지수를 고려한 저수유출 시뮬레이션 모형

金知學,許彰桓 충주대 2003 産業科學論文集 Vol.11 No.-

This study is aimed at the development of a deterministic runoff model which can be used for low flow runoff. The model is formulated by the watershed runoff model. Based on the assumptions that runoff system is nonlinear, the proposed watershed runoff models are the conceptual model and artificial neural network model. In the model structures, the conceptual model divide the runoff system into a surface structure and a subsurface structure corresponding to the surface flow, and inter flow and ground water flow. The lag time effect of surface can be represented by the sub-tank of surface structure in the conceptual model. Fifteen neural networks models using Quasi-Newton technique were prepared to find the optimum parameters with each of them having different numbers of hidden layers and hidden layers nodes. The parameter calibration of inter flow and ground water flow in the subsurface structure of the conceptual model is made by separating the components with numeric filter. The runoff coefficient(a2,K1) is expressed as the function of antecedent precipitation index(API) in the conceptual model. The parameters related to the surface flow can be calibrated with the runoff coefficient(a1, a11, c1, c2) in the conceptual model. In the conceptual and ann model an algorithm are developed to calibrate the parameters automatically based on efficiency criteria. The conceptual model shows more closely to the observed hydrograph than ann model.

降雨量의 頻度分析에 關한 硏究

金知學,申桂鍾,許彰桓 충주대 산업과학기술연구소 1994 産業科學論文集 Vol.2 No.-

This study aim at the development of the model of probability rainfall for return period by using frequency analysis. In this study, models of frequency analysis are classified to for lowing models : Two-Parameter lognormal distribution, Three-Parameter lognormal distribution, Pearson Type III distribution, Log-Pearson Type III distribution, Extremal Type I distribution. From the comparison of these models with rainfall data, it is found that Extremal Type I distribution is maximum value and Log-Pearson Type IIIf distribution is minimum value.

GIS를 이용한 유출해석

金知學,곽노은 충주대학교 산업대학원 2001 大學院論文輯 Vol.2 No.-

The aim of this study is to develop the physically-based parameters a geographic information system in order to account for the variability in time and space of the input data and the watershed characteristics. The excess rainfall is computed by means of the Soil Conservation Service runoff curve method and is spatially distributed by the GIS. A flow routing is used in the GIS to compute travel time through a channel network generated by the digital elevation model of the watershed. These parameters expressed the goodness of fit between the calculated hydrograph volume and peak discharge and the observed volume and peak discharge.