• 식물분류학회지
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• 제33권4호
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• pp.455-472
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• 2003

수우(樹友) 이창복교수는 1946년 서울대학교에 부임하여 1984년 퇴임하기까지 우리 나라 식물분류학계의 기반을 다지는데 큰 기여를 하였다. 특히, 1952년부터 1984년까지 33년간 남한지역에서 약 7만여 점의 표본을 채집하여 서울대학교 농업생명과학대학 수우(樹友)표본관(SNUA)의 근간을 확립하여 체계적인 국내 최대의 표본관으로 발전시켰다. 시기별 주요 채집 활동으로 1950년대는 소지 식별을 위한 채집과 박사학위 논문연구를 위한 채집, 1960년대는 1920-1930년에 걸쳐 일본학자인 T. Nakai가 채집한 희귀식물에 대한 분포 확인차원의 채집을 시도한 시기였고, 1970년대와 1984년까지 학술조사 목적으로 특정지역의 식물상을 조사하는 채집이 주를 이루었다. 이창복교수는 참나무속과 싸리속 표본에 대한 채집과 기타 목본, 희귀식물과 관련된 수집을 직접 현장에서 식물을 확인하고 확증 표본 확보에 주력하여 현재 SNUA의 소장표본이 전국 주요 지역 식물상의 대표성을 가지는데 많은 공헌을 하였다. 특히 이창복교수의 1950년 후반에서 1960년 초반에 걸쳐 채집하여 연구한 아시아산 낙엽성 참나무속에 대한 결과는 많은 관련 연구에 근간이 되고 있다. 그러나, 불행히도 표본을 제외한 기타 채집기록이 별로 남아 있지 않아 주요 채집지와 채집 날짜 이외에 조사와 채집의 목적을 명확하게 검증하기 어렵다.

• 한국농공학회지
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• 제30권3호
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• pp.58-68
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• 1988

Most of the Korean watersheds are mountaineous and consist of various soil types and land uses And seldom watersheds are found to have long term hydrologic records. The SNUA, a hydrologic watershed model was developed to meet the unique characteristics of Korean watershed and simulate the storm hydrographs from a small mountaineous watershed. Also the applicability of the model was tested by comparing the simulated storm hydrographs and the observed from Dochuk watershed, Gwangjugun, Kyunggido The conclusions obtained in this study could be summarized as follows ; 1. The model includes the simulation of interception, evaporation and infiltration for land surface hydrologic cycle on the single storm basis and the flow routing features for both overland and channel systems. 2. Net rainfall is estimated from the continuous computation of water balance at the surface of interception storage accounting for the rainfall intensities and the evaporation losses at each time step. 3. Excess rainfall is calculated by the abstraction of infiltration loss estimated by the Green and Ainpt Model from the net rainfall. 4. A momentum equation in the form of kinematic wave representation is solved by the finite differential method to obtain the runoff rate at the exit of the watershed. 5. The developed SNUA Model is a type of distributed and event model that considers the spatial distribution of the watershed parameters and simulates the hydrograph on a single storm basis. 6. The results of verification test show that the simulated peak flows agree with the observed in the occurence time but have relative enors in the range of 5.4-40.6% in various flow rates and also show that the simulated total runoff have 6.9-32% of relative errors against the observed. 7. To improve the applicability of the model, it was thought that more studies like the application test to the other watersheds of various types or the addition of the other hydrologk components describing subsurface storages are needed.

• 한국농공학회지
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• 제32권E호
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• pp.33-46
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• 1990

Abstract Over 700/0 of the rural land area in Korea is mountainous and small watersheds provide most of the water resources for agricutural use. To provide an appropriate tool for the agricultural water resource development project, SNUA2, a mathematical model for simulating the physical processes governing the precipitation-runoff relationships and predicting the storm and long-term runoff quantities from the small mountainous watersheds was developed. The hydrological characteristics of small mountainous watersheds were reviewed to select appropriate theories for the simulation of the runoff processes, and a deterministic and distributed model was developed. In this, subsurface flows are routed by solving Richard's two dimensional equation, the dynamics of soil moisture contents are simulated by the consideration of phenological factors of canopy plants and surface flows are routed by solving the kinematic wave theory by numerical analysis. As a result of an application test of the model to the Sanglim watershed, peak flow rates of storm runoff were over-estimated by up to 184.2%. The occurence time of peak flow and total runoff volume of storm runoffs simulated were consistent with observed values and the annual runoff volumes were simulated in the error range of less than 5.8%.

• 한국농공학회지
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• 제32권3호
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• pp.116-129
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• 1990

A rational management of water resources in estuary reservoirs necessiates the prediction of water quality. In this study, a multiple box model for the water quality prediction was developed as a tool for the purpose of examining an adequate way to improve and maintain the water quality. Some submodels that are suitable for simulating the mixing behavior of pollutant materials in a lake were considered in this model. The model was appiled for predicting water qualities of Haenam Esturay Reservoir. The result from this study can be summarized as follows : 1.A water quality simulation model that can predict the 10-day mean value of water qualities was developed by adding some submodels that simulate the concentrations of chlorophyll-a, BOD, T-P and T-N to the existing Multiple Box Model representing the mixing and circulating of materials by the hydarulic action. 2.As input data for the model developed, the climatic data including precipitation, solar radiation, temperature, cloudness, wind speed and relative humidity, and the water buget records including the pumping discharge and the releasing discharge by drainage gate were ollected. The hydrologic data for the inflow discharge from the watershed was obtained by simulation with the aid of USDAUL-74/SNUA watershed model. Also the water quality data were measured at streams and the reservoir. 3.As a result of calibration and verification test by using four comonents of water quality such as Chlorophyll-a, BOD, T-P and T-N, it was found that the correlation coefficeints between the observed and the simulated water qualities showed greater than 0.6, therefore the capability of the model to simulate the water quality was proved. 4.The result based on the model application showed that the water quality of the Haenam Estuary Reservoir varies seasonally with the harmonic trend, however the water quality is good in winter and get worse in summer. Also it may be concluded that the current grarde of water quality in the Heanam Esutary Reservoir is ranked as grade 4 suitable only for the agricultutal use.