• 한국수자원학회논문집
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• 제36권3호
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• pp.399-411
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• 2003

Nash의 관측평균순간단위도의 신뢰구간을 결정하는 기법을 개발하였다. 이 방법은 두 매개변수를 Box-Cox 변환과 유역의 상사성관계식을 이용하여 이변수정규분포의 확률변수화하고 이들의 선형 상관관계를 이용한 통계적 추정과정과 더불어 parametric bootstrap 방법을 이용한 단위도의 신뢰구간 산정 등으로 구성된다. 또한 이 방법은 미계측유역에 대한 단위도 추정에도 이용이 가능한 특징을 갖고 있다. 위천유역에 대하여 제안된 방법을 적용한 결과 제시된 방법론은 단위도의 불확실성을 평가하고 그리고 미계측 유역에 대한 매개변수 추정에 있어서 적절한 대안임을 확인할 수 있었다.

• 한국공간정보시스템학회 논문지
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• 제11권1호
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• pp.97-104
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• 2009

현재 GIS는 유역의 지형학적 분석분야에서 뿐만아니라 유역의 수문학적 분석분야에서도 유용한 도구로 활발하게 활용되고 있다. 본 연구에서는 SSARR모형을 기반으로한 유역유출분석 모형을 활용하여 금강유역을 대상으로 장기유출량을 산정, 검증하고 이를 토대로 강우-유출 관리 모듈과 연계하여 신뢰도 있는 수문정보를 산정하여 사용자에게 제공코자 하였다. 모의와 검증을 거친 적정한 토양습윤지표, 용수이용량, 직접 및 기저유출량 등의 다양한 수문성분들이 GIS Tool의 활용을 통하여 소유역 단위의 유용한 수문학적 공간정보로서 생산되었다. 또한 사용자의 편의를 위하여 Graphic User Interface를 설계하여 다양한 수문정보를 도시함으로써 향후 효율적 유역수문관리를 지원하는 Toolkit으로 활용될 수 있을 것으로 판단된다.

• 물과 미래
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• 제10권2호
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• pp.101-111
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• 1977

The analysis performed here is aimed to increase the familiarity of hydrologic process especially for the small basins which are densely gaged. Kyung An and Mu Shim river basins are selected as a represectative basin according to the criteria which UNESCO has establisheed back in 1964 and being operated under the auspice of Ministry of Construction. The data exerted from these basins is utilized for the determination of the characteristics of precipitation and runoff phenomena for the small basin, which is considerred as a typical Korean samll watershed. The methodology developed by Soil Conservation Service, USA for determination of runoff value from precipitation is applied to find the suitability of the method to Korean River Basin. The soil cover complex number or runoff curve number was determined by considering the type of soil, soil cover, land use and other factor such as antecent moisture content. The averag values of CN for Kyung An and Mushim river basins were found to be 63.9 and 63.1 under AMC II, however, the values obtained from soil cover complex was less than those from total precipitation and effective precicpitation by 10-30%. It may be worth to note that an attention has to be paid in the application of SCS method lo Korean river basin by adjusting 10-30% increase to the value obtained from soil cover complex. Finally, the design flood hydrograph was consturcted by employing unit hydrograph technique to the dimensionless mass curve. Also a stepwise multiple regression was performed to find the relationship between runoff and API, evapotranspiration rate, 5 days antecedent precipitation and daily temperature.

• 물과 미래
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• 제18권2호
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• pp.143-152
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• 1985

Horton의 지형법칙을 수문응답의 직접변수로 결합시켜 유출수문곡선을 재현하는 방법을 제시하였다 Itrube 등의 지형학적 순간단위도(Geomorphologic IUH) 이론과 Bras 등의 지형기후학적 순간단위도(Georphoclimatic IUH) 이론을 Sukekawa가 제시한 홍수유출모델에 적용시켜, 지형인자 및 기후특성이 고려된 수문응답함수를 재구성하였다. 분석결과 본 이론의 실제 유역에 대한 적용이 우수하였으며, 유역을 m(1∼4)개의 저수지로 모델화할 때, 유역면적의 대소에 관계없이 유역을 2개의 저수지로 가정한 m=2인 모델이 가장 적합한 것으로 나타났다. 또한 하천 차수법을 이용 유역을 모델화함으로서 본 이론의 확대해석이나 일반화가 이루어질 수 있을 것으로 판단되었다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.2276-2280
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• 2008

가뭄은 강우의 시기별 지역별 불균형으로 인해 발생하며 한 계절에서 1년, 길게는 수년 동안 지속되는 시간 특성을 가지면서 그 시작과 끝을 명확하게 정의하기가 힘들고 지속적으로 누적된 효과가 천천히 나타난다. 이러한 가뭄의 관리를 위해서는 시간적인 가뭄의 발생과 공간적인 가뭄의 분포를 파악하는 것이 중요하며, 가뭄의 진행상황이나 심도를 정의할 수 있는 객관적인 기준을 통해 수행할 수 있을 것이다. 토양수분가뭄지수(Soil Moisture Drought Index)는 식생에 영향을 주는 가뭄을 판단하기 위한 지표로서 강수량, 기온, 풍속, 습도, 토양물리 특성자료를 바탕으로 산정된다. 본 연구에서 사용한 토양수분가뭄지수는 가뭄 상태를 유효수분백분율의 50%이하일 때로 정의하고, 지속기간(duration), 크기(magnitude), 강도 (severity)의 세 가지 기준을 이용하여 가뭄을 분석하였다. 이 지수는 일별 모의가 가능하고 자연 상태의 가뭄표시, 선행적인 가뭄제시, 단기적인 가뭄평가 이라는 장점을 가진다. 따라서 본 연구에서는 웹 기반 GIS를 이용하여 실시간으로 표준유역 단위별 토양수분가뭄지수를 산정하고 이를 통해 가뭄을 평가할 수 있는 방안을 제시하고자 한다.

• 한국환경보건학회지
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• 제31권6호
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• pp.467-474
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• 2005

The runoff characteristics of combined sewer overflow(CSO) in the urban area of Jeonju were investigated and analyzed by using the SWMM (Storm Water Management Model) and GIS. From August to November 2004, investigations on two rainfall events were performed and flowrate, pH, BOD, COD, SS, T-N and T-P were measured. these data were used for model calibration. Using GIS technique, watershed characteristics of study area were calculated. that is, divide into sub_basin, total width, slope, make soil map etc. On the basis of the measured data and the simulation results by SWMM, it could be known that the $80-90\%$ of pollution load are discharged in early-stage storm runoff. SMC(site mean Concentration) for combined sewer system area were BOD 28.1, COD 31.5, SS 186 ppm etc. this is shown that during the rain fall, high concentration of waste was loaded to receiving water. Unit loads of combined sewer system area were BOD 306, COD 410, SS 789, T-N 79, T-P 6.8 kg/ha/yr.

• 환경영향평가
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• 제14권5호
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• pp.255-262
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• 2005

In summer and early autumn, eutrophication occurs occasionally in many reservoirs. Lakeside macrophyte which is one of internal pollutants effects on water quality when it is submerged during water surface is rising after rainy season. This study include examination of pollutant load, species of plant, community structure and productivity of macrophyte in unit area at lakeside. The result of this research will be used as a guideline of water quality management on reservoir through assessing water quality effect of submerged plant. The areal distribution, composition of species and submerged area of macrophyte changes according to rainfall pattern every year, so it is difficult to calculate nutrient load annually from submerged macrophyte. In this study, the nutrient load from submerged macrophyte assess from Daecheong and Juam reservoir in 2001. TN and TP load of submerged macrophyte shows 0.043% and 0.069%, respectively, of annual discharge load on Daecheong watershed. At lake Juam, TN and TP shows 0.64% and 1.28% load, respectively. The reason that nutrient load of lake Juam is greater than that of lake Daecheong is that macrophyte distribution area of lake Juam is 5 times greater than that of lake Daecheong. Total nutrient load of lake Daecheong is 3 times greater than that of lake Juam.

• 한국물환경학회지
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• 제20권4호
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• pp.333-338
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• 2004

This study was carried out to investigate the generation and discharge characteristics of non-point pollutants from farmlands in Nak-dong river basin. Annual unit generation load of nitrogen and phosphorus by fertilization in the test paddy field was almost similar to those calculated by the fertilization standards of district agricultural technology center, but it was extremely higher in case of the test dry field. By comparing annual total generation load of nutrients from fertilization to the data of fertilizer marketing, the accurate forecasting of generation load of pollutants was achieved by marketing data. The annual total discharge ratio of nutrients through infiltration and overflow from the farmland of the test paddy field were 9.5% and 1.1%, respectively, and those in the test dry field were 22.0% and 0.1%, respectively. The monthly discharge load of nutrients were shown the highest proportioned to the discharge load from lands, but it showed higher in phosphorus, which was caused by the intermittent discharge of phosphorus accumulated in drainage.

• 한국물환경학회지
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• 제28권3호
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• pp.426-435
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• 2012

The variation of stream flow is the one of the most important factors which influence on that of water quality in the unit watershed. The target water quality goal is established and permissible load is allotted in the base of the standard flow condition along with its water quality for the management of Total Maximum Daily Loads (TMDLs). A standard flow selected could cause problems in the load allotment if it was not properly arranged. This study reviewed the acquisition of water quality data, the self-variation and the retainability in water quality on the specific flow conditions. This study also proposed the median and the adjusted average flow condition out of general flow conditions as alternative standard flow conditions. It is considered that the alternatives can make the water quality data easily acquired and the water quality representativeness more enhanced on the standard flow conditions.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.389-392
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• 2004

A recent unusual change in the weather is formed as a localized heavy rain in a short time. This phenomenon has caused a flash flood, and flash floods extensively have damaged human lives many times. In large river's case, the extent of loss of lives and properties has been decreased through the flood warning system by flood control stations of each stream. However, the extent of damage in other small rivers has increased reversely. Therefore, it is necessary to establish a new flood warning system against flash floods instead of the existing flood warning system. It is a specific character that the damage from flash floods in mountain streams brings much more loss of lives than large river's flood. The purpose of this study is calculating the characteristic of flash floods in streams, analyzing topographical characteristics of water basin through applying GIS techniques with the calculation as mentioned above and researching what topographical conditions have influence on hydrological flash floods in water basin. The flash flood prediction model we used is made by GIUH (geomorphoclimatic instantaneous unit hydrograph) with hydrologic-topographical technology. As applying the flash flood prediction model, this is a procedure for calculating topographical information in basin: we made a topological data up out of database with utilizing GIS, and we also produced a DEM (digital elevation model) and used it as a topographical data for determining amount of flash floods.