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심창석 ( Chang Seok Shim ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.2
Distributed model is applied to actual rainfall in this study, then compared and analyzed, and the results are as follows; AGNPS model theory and algorithm are applied to actual rainfall event by constructing a number of mashes considering homogeneity for estimation of the spatially varying palrameters from the surface factors like soil characteristics, topography, plantation, and so on, and meteorological factors of the watershed. Dongkok, Koro, Misung, Byeongchun, Hyoryeong and Musung are constructed with 12, 30, 45, 76, 46 and 126 coarse grids respectively, and subdivided into 8, 24, 24, 44, 12 and 64 fine grids respectively for detailed channel direction and slope shape of the stream. Simulation result using AGNPS shows that the values of the peak flow have relative errors of 1.0~25.0%, 4.0~27.0%, 7.0~29.2%, 2.0~23.9%, 3.0~25.0%, 3.6~21.0% for each rainfall event at Dongkok, Koro, Misung, Byeongchun, Hyoryeong and Musung, respectively when the peak flows were compared with the measured values. Analysis result from AMC Ⅱ shows similarity to the measured, while the results from AMC Ⅰ or from AMC Ⅲ shows relatively small or great values, respectively. Modified curve numbers are reorganized to modify and complement the CN values according to AMC conditions suggested by the SCS so they fit to our circumstance, and the estimation result of the coefficient in the modified curve number method shows mostly coincident pattern with recently addressed research results. Estimation result by proposed modified method is almost similar to the measured. The relation to estimate CN for runoff computation by AGNPS is derived using antecedent precipitation, soil porosity, and topographic factor that is gradient of each cell, and the analysis result shows that there is the closest correlation between CN and the antecedent precipitation.
AGNPS 모델에 의한 비점오염원으로부터 하천으로 유입되는 오염부하량 예측
심창석 ( Sim Chang Seog ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.1
To predict the pollutant load from non-point source of agriculture basin, AGricultural Non-Point Source(AGNPS) was applied for small river of Gaeun Chun located at Sangju city. The applied basin area had the cultivation area of about 41% such as rice paddy field, patch, and orchard and the forest area of 58.7%. Observed peak flow rate during July to September 2002 were 0.026㎥/sec∼9.265㎥/sec for P-1, 0.01 O㎥/sec∼2.747㎥/sec for P-2 and 0.064㎥/sec∼13.482㎥/sec for P-3. The concentration of total nitrogen(T-N) and total phosphorus(T-P) were 2.80∼10.70㎎/L and 0.25∼1.84㎎/L for P-1, 2.70∼8.90㎎/L and 0.27∼1.9l㎎/L for P-2, and 2.80-9.70㎎/L and 0.25∼1.79㎎/L for P-3, respectively, which indicated the small river was considerably affected by non-point source. The simulation results of the AGNPS were given in the correlation equations from the observed and calculated values as follows: TNc= 1.3885 TNo^(0.7864)(R2=0.894) and TPc=1.2399 TPo^(0.9459) (R2=0.794).
유사량 산정공식에 따른 유사 및 하상변동 예측에 관한 연구
고수현,송인렬,심창석 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3
The purpose of this study is to analyze the characteristics of riverbed variation due to the sediment protection weir located on the estuary of the main stream of Taehwa river using 1-D finite difference model, HEC-6 model, and the followings are the results of estimating sediment transport rate, amount of scour or deposition, and accumulated amount of deposit according to before and after of the sediment protection weir removal with various flow rates in the channel. Ackers-White transport function produced the greatest sediment transport rate while Meyer-Peter showed the smallest sediment transport rate at the most down stream area of the watershed through the sediment transport rate analyses for various flow rates according to the existence or nonexistence of the sediment protection weir. Toffaleti's and Colby transport function were closest to the average value, and the difference among the results of the sediment transport functions showed up to 8 ~9 times. Duboy's transport function produced the greatest riverbed variation while Toffaleti's showed the smallest variation through the riverbed variation analyses according to the existence or nonexistence of the sediment protection weir. Yang's was closest to the average value, and the difference among the results of the riverbed variation analyses ranged from 1.4 times to 11 times. It is thought that a sediment transport function must be selected very carefully with respect to the criteria of sediment yield estimation because the analysis results of the sediment transport rate and riverbed variation according to flow rates showed significant differences among the sediment transport functions, and the differences of sediment transport rate and riverbed variation according to the various sediment transport functions decreased as the flow rate increased.
분포형 모형을 이용한 실제 및 확률강우랑에 따른 농업유역의 비점원 오염예측
최윤영(Yun Young Choi),최정우(Jung Woo Choi),심창석(Chang Suk Sim),김영성(Young Sung Kim) 한국수처리학회 1999 한국수처리학회지 Vol.7 No.3
In this study, mid(Daedae-kyo) and down(Hoiya dam) streams of Hoiya dam basin are fixed as the analysis targets for application of AGNPS model according to real and probable rainfall, and probable flood and water quality change are predicted from the comparison and analysis of peak flow, sediment amount, and total nitrogen and phosphorus according to each of flow rainfall events. It is analyzed that existing rainfall distribution type is type II from the analysis of rainfall distribution type and time distribution pattern using Huff distribution method with rainfall data of Hoiya dam basin. Frequency analysis of each return period is performed to be utilized for probable flood estimation and water quality analysis, thus probable flood is estimated as Gumbel`s extreme value distribution. 35 grids are subdivided into 134 fine grids of finite differential net to analyze the peak flow, sediment amount, and nutrition materials of the basin, and peak flows of Daedae-kyo and Hoiya dam through the analysis by AGNPS model are 105∼142㎥/sec and 155∼218㎥/sec respectively. The corrected CN estimation equation shows good result for the relation of precipitation and peak flow. Estimated sediment amount of each rainfall event at Daedae-kyo and Hoiya dam basin shows 120∼170% of actual sediment amount. It is found that T-Ps of Daedae-kyo and Hoiya dam are reduced as much as 0.015∼0.041ppm and 0.012∼0.058ppm, and T-N of each location decreases 0.03∼0.54ppm and 0.1∼0.50ppm respectively from the analysis results of T-P and T-N according to actual rainfall in Hoiya dam area. Relatively good results appear through regression analysis of observed and computed data of actual flow, T-P, and T-N in Hoiya dam area, and T-P and T-N`s calculated values of probable rainfall show the tendency which is reduced as much as the probable flood is increased, but the reducing width of T-N is very greater than T-P.
제주도 동부지역에서 해수침입에 의한 지하수 염분화에 관한 연구
최윤영(Yun Young Choi),고병련(Byong Ryun Ko),심창석(Chang Suk Sim),최정우(Jung Woo Choi),고수현(Soo Hyun Ko) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.4
The study area is the eastern part of Cheju island where salinization occurs severely by seawater intrusion. Physical and chemical water quality analysis is performed for widely spread groundwater tube wells of 32 points and springs of 15 points in the east area of Cheju island. It is found that Gujwa and Sungsan zone show the water quality component of Cl-SO₄ and Cl-SO₄-HCO₃, and Pyosun zone HCO₃-Cl-SO₄ from the results of classification by Back`s type(1961). From the characteristics of March and September, Gujwa and Pyosun zone don`t show the variation of water quality but Sungsan zone shows the movement of a part from Na-Ca type to Ca-Na type on the side of the positive ions. The causes of water quality variation and water property are from the seawater intrusion. It is thought that Gujwa and Sungsan zone have strong correlation of Cl and Na that is the index of the salinization while their correlation in Pyosun zone is weak from the result of comparision and examination by the statistical method of SAS for extraction of the ionic factors that indicate the salinization source among the study areas.