• 한국환경복원기술학회지
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• 제17권4호
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• pp.1-15
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• 2014

Forest ecosystems generate variety of important goods and services for human well-being. As a growing concern of climate change and water shortage, it is necessary to quantify, model and map water balance in forest. In this study, we have analyzed 11 overseas forest water supply models (AIM, ATEAM, CENTURY, (E)SWAT, GUMBO, InVEST, PLM, SAVANNA, WaSSI, WaterGAP, WBM) and compared their scale, input and out data, availability of the models and analyzed the applicability of the models to Korea. As a result, InVEST and WaterGAP model appeared to be applicable for quantifying water provisioning services in Korea. A systematic approach for applying to evaluate water balance in forest was suggested based on our quantification approach.

• 상하수도학회지
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• 제29권3호
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• pp.427-436
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• 2015

Developing two process models to simulate wastewater treatment process is needed to draw a comparison between measured BOD data and estimated process model data: a mathematical model based on the process mass-balance and an ANN (artificial neural network) model. Those two types of simulator can fit well in terms of effluent BOD data, which models are formulated based on the distinctive five parameters: influent flow rate, effluent flow rate, influent BOD concentration, biomass concentration, and returned sludge percentage. The structuralized mass-balance model and ANN modeI with seasonal periods can estimate data set more precisely, and changing optimization algorithm for the penalty could be a useful option to tune up the process behavior estimations. An complex model such as ANN model coupled with mass-balance equation will be required to simulate process dynamics more accurately.

• 한국수자원학회논문집
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• 제40권2호
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• pp.147-158
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• 2007

본 연구는 기후변화에 따른 수자원 영향평가를 위해 적합한 수문모형을 선택하고 지역기후모형인 SNURCM에서 생성한 모의기상자료로 유출량을 생성하여 모의정확성을 평가하였다. 4개의 월 물수지모형과 두개의 일 유출모형을 이용하여 대청댐 상류유역의 유입량 모의능력을 비교한 결과 abcd모형이 월 물수지모형 중에서는 가장 뛰어났고, 국내에서 널리 사용되고 있는 일 유출모형인 SSARR와 비슷한 모의정확성을 보였다. 다음으로 abcd모형을 금강유역의 12개 소유역에 적용하기 위하여 매개변수 지역화기법을 사용하였다. 9개의 다목적댐에서 구한 매개변수를 미계측유역으로 가정한 4개 다목적댐에 대하여 지역화기법으로 매개변수를 추정하여 유출량을 모의한 결과 모든 지역에서 효율성계수가 최소 87% 이상으로 모의능력이 우수하였다. 마지막으로 금강유역 12개 소유역의 SNURCM모의강수를 실측강수와 비교한 결과 모든 소유역에서의 효율성계수는 60% 이상이었으며, SNURCM 모의강수자료를 abcd모형에 입력하여 생성한 모의유출량을 대청댐 실측유입량과 비교한 결과 효율성계수가 80% 이상으로 기후변화 연구에 활용 가능함을 확인하였다.

• 한국농공학회논문집
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• 제66권3호
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• pp.39-51
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• 2024

To effectively implement the integrated water management policy outlined in the National Water Management Act, it is essential to analyze agricultural water supply and demand at both basin and water district levels. Currently, agricultural water is primarily distributed through open canal systems and controlled by floodgates, yet the utilization-to-supply ratio remains at a mere 48%. In the case of agricultural water, when analyzing water balance through existing national basin water resource models (K-WEAP, K-MODISM), distortion of supply and regression occurs due to calculation of regression rate based on the concept of net water consumption. In addition, by simplifying the complex and diverse agricultural water supply system within the basin into a single virtual reservoir, it is difficult to analyze the surplus or shortage of agricultural water for each field within the basin. There are limitations in reflecting the characteristics and actual sites of rural water areas, such as inconsistencies with river and reservoir supply priority sites. This study focuses on the development of a model aimed at improving the deficiencies of current water balance analysis methods. The developed model aims to provide standardized water balance analysis nationwide, with initial application to the Anseo standard watershed. Utilizing data from 32 facilities within the standard watershed, the study conducted water balance analysis through watershed linkage, highlighting differences and improvements compared to existing methods.

• 한국농공학회지
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• 제37권2호
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• pp.13.2-20
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• 1995

An water balance model was formulated to simulate the change in water levels at the estuary reservoir from sluice gate releases and the inflow hydrographs, and an one-di- mensional flood routing model was formulated to simulate temporal and spatial varia- tions of flood hydrographs along the estuarine river. Flow rates through sluice gates were calibrated with data from the estuary dam, and the results were used for a water balance model, which did a good job in predicting the water level fluctuations. The flood routing model which used the results from two hydrologic models and the water balance model simulated hydrographs that were in close agreement with the observed data. The flood forecasting model was found to be applicable to real-time forecasting of water level fluc- tuations with reasonable accuracies.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 1992년도 수공학연구발표회논문집
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• pp.443-447
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• 1992

This study describes the strategy for advanced decision support system (ADSS) development for integrated management of water resources and quality in reservoir systems. The developed ADSS consists of database that contain hydrologic data, observed operational data, and data to support specific reservoir operations simulation, optimization models, and water quality models. The optimization model, mass balance simulation model and water quality models are used in a general prototype ADSS, menu driven controlling framework that assists the user to specify and evaluate the alternative operational scenarios at one time. These alternative scenarios are evaluated by the models and the results are compared through the use of a graphical based display system. This graphical based system uses an icon based schematic representation of the system to organize the presentation of the results. The ADSS includes the ability to use monthly or weekly time periods of analysis for the models and it can use monthly historical or stochastically generated inflows.

• 한국수자원학회논문집
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• 제34권6호
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• pp.713-724
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• 2001

수자원 기술자들은 수자원 계획에 있어서 중요한 월유출 모의 모형을 개발하여 왔으며, 우리 나라에서는 가지야마 모형을 대표적인 월유출 모형으로 이용하고 있다. 최근 Xiong과 Guo (1999)는 2-변수 월 물수지 방정식 모형 을 제안하였고, 수자원 계획과 기상학적인 영향을 분석하기 위하여 제안한 모형을 이용할 수 있음을 보였다. 그러나 그들은 시간변환 변수 c와 저수지 포장 용수량 변수 SC를 시행착오에 의하여 추정하였다. 따라서, 본 연구의 목적은 2-변수 모형의 변수인 c와 SC를 추정하는 방법론을 제안하고, 2-변수 월 물수지 방정식 모형과 가지야마 모형을 한강 유역과 IHP 대표유역에 적용하여 비교 점토하고자 한다. c는 실제 증발산량과 잠재 증발산량 사이의 관계에 의하여 추정하였고, SC는 CN 값과의 관계를 사용하여 추정하였으며, 추정된 모형변수 c와 SC는 2-변 수 월 물수지 방정식 모형을 위하여 초기치 혹은 최적치로 이용할 수 있음을 보이고자 한다.

• 한국지형학회지
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• 제23권1호
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• pp.87-101
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• 2016

This study was conducted to develop a hydrological model of catchment water balance which is able to estimate irrigation return flows, so BROOK90-K (Kongju National University) was developed as a result of the study. BROOK90-K consists of three main modules. The first module was designed to simulate water balance for reservoir and its catchment. The second and third module was designed to simulate hydrological processes in rice paddy fields located on lower watershed and lower watershed excluding rice paddy fields. The models consider behavior of floodgate manager for estimating the storage of reservoir, and modules for water balance in lower watershed reflects agricultural factors, such as irrigation period and, complex sources of water supply, as well as irrigation methods. In this study, the models were applied on Guryangcheon stream watershed. R2, Nash-Sutcliffe efficiency (NS), NS-log1p, and root mean square error between simulated and observed discharge were 0.79, 0.79, 0.69, and 4.27 mm/d respectively in the model calibration period (2001~2003). Furthermore, the model efficiencies were 0.91, 0.91, 0.73, and 2.38 mm/d respectively over the model validation period (2004~2006). In the future, the developed BROOK90-K is expected to be utilized for various modeling studies, such as the prediction of water demand, water quality environment analysis, and the development of algorithms for effective management of reservoir.

• 한국수자원학회논문집
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• 제47권6호
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• pp.547-559
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• 2014

본 연구에서는 잠재증발산량과 실제증발산량 간의 보완관계식을 이용한 대표적인 증발산량 산정모형인 Brutsaert and Stricker (1979)의 AA 모형과 Morton (1983)의 CRAE 모형의 적용성을 평가하였다. 이를 위해서 두 모형을 복하천 중상류 유역에 적용하여 유역평균 실제증발산량을 산정하고, 유역 물수지 결과와의 비교를 수행하였다. 연구 대상유역은 양질의 하천유량 자료 확보 기간이 짧고, 하천유량 자료 또한 인위적 물이용, 배출로 인해 교란되었기에 강수량, 유출량 등의 관측치 기반의 유역 물수지 결과 보다는 검보정이 잘된 유역수문모형 SWAT-K로 모의한 실제증발산량과의 비교를 통하여 AA 모형과 CRAE 모형으로 산정한 실제증발산량의 적정성을 평가하였다. AA 모형과 CRAE 모형의 의한 실제증발산량 모두 식생성장기에 과다하게 산정되는 경향을 나타내었고, 특히 AA 모형은 건조기간동안 실제증발산량이 과소하게 산정되었다. AA 모형과 CRAE 모형의 정도를 높이기 위해서 매개변수 보정을 수행한 결과, AA 모형의 경우는 건조기간 동안의 적합성을 높이기 위해서 이류항을 추가로 고려하고 Brutsaert and Stricker (1979)의 제안 값 ${\alpha}=1.26$ 보다는 작은 ${\alpha}=1.08$을 사용하였을 때, 그리고 CRAE 모형의 경우에는 Morton(1983)이 제안한 값 $b_1=14Wm^{-2}$, $b_2=1.12$ 보다는 각각 다소 크고 작은 값인$b_1=16Wm^{-2}$, $b_2=1.04$를 사용하였을 때에 연단위, 월단위, 그리고 월별 모두 가장 양호한 실제증발산량 값이 산정되었다.

• 한국농공학회지
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• 제32권E호
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• pp.88-94
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• 1990

Several models physically based to predict the evolution of the snowpack have been proposed. Validity of these models for hourly estimation is, however, questionable, since they have been tested only on a daily basis. A computational model to predict the amount of snowpack on an hourly basis in terms of snowload from a set of meterological measurements was developed and investigated the rapid snowmelt conditions during Fohn events in the Takada plain.