• 한국수자원학회논문집
• /
• 제38권7호
• /
• pp.565-574
• /
• 2005

평창강 수질자동측정망 실시간 자료를 이용하여 강우시와 무강우시로 구분하여 분석하였다. 강우시에 측정된 TOC 자료는 무강우시 측정된 자료에 비해 평균값, 최대값, 표준편차가 크게 나타났으며, 강우시의 DO 자료는 무강우시에 측정된 자료보다 낮아 유량이 수질변화에 영향을 미치는 것으로 분석되었다. 신경망 모형과 뉴로-퍼지 모형으로 수질예측 모형을 구성하고, 적용하였다. LMNN, MDNN, ANFIS 모형은 TOC 모의에서 DO 예측에서는 LMNN, MDNN 모형이 ANFIS 모형보다 좋은 결과를 보였으며, 정량적 자료에 정성적 자료인 시간을 학습한 MDNN 모형이 가장 작은 오차를 보였다. 하천의 실시간적 관리를 위해서는 유량과 수질의 측정이 동일한 지점에서 동시간적으로 이루어져야 보다 효과적이다. 그러나 수질자동측정망 지점과 T/M 수위관측소가 원거리에 위치한 경우들이 있으며, 평창강 수질자동측정망 지점이 그 중 하나이다. 연구에서는 평창강 수질자동측정망 지점의 유출예측을 위한 신경망 모형을 구성하여 수질예측 모형과 연계하였으며, 연계된 모형은 수질예측에 개선된 결과를 보였다.

• 한국환경농학회지
• /
• 제10권1호
• /
• pp.67-75
• /
• 1991

본(本) 연구(硏究)는 만경강(萬頃江) 수계(水系)에 QUAL-IIE Model을 적용(適用)하여 장래수질예측(將來水質豫測)을 실시(實施)한 것으로 얻은 결론(結論)을 요약(要約)하면 다음과 같다. 1. M-3(백구정) 지점(地點)에서 실측(實測) BOD와 계산(計算) BOD의 오차범위(誤差範圍)는 10% 이내(以內)로서 적용(適用)모델은 만족스럽다. 동지점(同地點)에서 감응도분석결과(感應度分析結果) 만경강(萬頃江) 수계오염(水系汚染)에 영향(影響)을 미치는 가장 큰 인자(因子)는 전주천(全州川)의 유입부하량(流入負荷量)이다. 2. 예측결과(豫測結果) 하구(河口)로부터 약(約) 41km (지점)(M-1)에서 전주천(全州川)의 고농도(高濃度) 오염수(汚染水)가 유입(流入)되므로서 심(甚)한 오염상태(汚染狀態)를 나타내며, 또한 하구(河口)로부터 약(約) 28km 지점(地點)(M-3)에서는 수표면적(水表面積)이 넓어지면서 자정효과(自淨效果)가 크게 향상(向上)되어 수질개선(水質改善)이 이루어졌다. 3. 제수문(制水門) 이하(以下) 하류(下流)에서는 감조구간(感潮區間)으로 동(同) Model의 계산결과(計算結果)의 신뢰성(信賴性)이 떨어지므로 감조구간(感潮區間)에서 동(同) Model의 적용(適用)은 곤난(困難)하다. 4. BOD의 경우에는 전구간(全區間)이 심(甚)한 오염상태(汚染狀態)를 나타내며 M-3 지점(地點)에서 그 농도(濃度)가 1996년 26.6mg/1, 2001년(年) 30.7mg/1, 2006년(年) 33mg/1 그리고 2011년(年) 37.5mg/1로서 수질오염방지대책(水質汚染防止對策)이 수립(樹立)되지 않으면 용수관리(用水管理)에 있어서 많은 문제점(問題點)이 야기(惹起)될 것이다.

• 한국물환경학회지
• /
• 제34권1호
• /
• pp.33-45
• /
• 2018

In this study, we discussed the application of Watershed model and Load Duration Curves (LDC) in Total Water Load Management System. The Flow Duration Curves (FDC) and the LDC were generated using the results of the daily HSPF model and analyzed on monthly or yearly flow duration variability, and non-point pollutant discharge loads by entire flow conditions. As a result of the calibration and verification of the HSPF model, both the flow and the water quality were appropriately simulated. The simulated values were used to generate the Flow Duration Curve and the Load Duration Curve, and then the excess rate by entire flow conditions was analyzed. The point and non-point pollutant discharge loads for entire flow conditions were calculated. It is possible to evaluate the variability of water quality in specific flow duration through the curves reflecting the flow duration variability and to confirm the characteristics of the pollutant source. For a more scientific Total Water Load Management System, it is necessary to switch from a current system to a system that can take into account the entire flow conditions. For this, the application of the watershed model and load duration curve is considered to be the best alternative.

• 한국농공학회논문집
• /
• 제62권3호
• /
• pp.1-13
• /
• 2020

The management of agricultural water can be divided into management of agricultural infrastructure and operation to determine the timing and quantity of water supply. The target of water management is classified as water-supply facilities, such as reservoirs, irrigation water supply, sluice gate control, and farmland. In the case of agricultural drought, there is a need for water supply capacity in reservoirs and for drought assessment in paddy fields that receive water from reservoirs. Therefore, it is necessary to analyze the water supply amount from intake capacity to irrigation canal network. The analysis of the irrigation canal network should be considered for efficient operation and planning concerning optimized irrigation and water allocation. In this study, we applied a hydraulic analysis model for agricultural irrigation networks by adding the functions of irrigation canal network analysis using the SWMM (Storm Water Management Model) module and actual irrigation water supply log data from May to August during 2015-2019 years in Sinsong reservoir. The irrigation satisfaction of ponding depth in paddy fields was analyzed through the ratio of the number of days the target ponding depth was reached for each fields. This hydraulic model can assist with accurate irrigation scheduling based on its simulation results. The results of evaluating the irrigation efficiency of water supply can be used for efficient water distribution and management during the drought events.

• 한국수자원학회논문집
• /
• 제53권8호
• /
• pp.569-582
• /
• 2020

최근 우리나라는 도시화로 인해 수자원이용 환경이 급격한 변화를 맞이하였으며, 이로 인해 유출현상을 정량적으로 규명하여 가용수자원을 최적배분 하는데 어려움이 발생하고 있다. 이를 대비하기 위하여 국가물관리계획, 하천유역수자원관리계획 등이 제안되고 있으며, 효율적인 수자원 운영 계획 수립을 위해서는 정확하며 상세한 물수지 분석이 요구되고 있다. 그러나 기존에 수행되는 물수지 분석은 유역의 물순환 상황을 충분히 반영하지 못하며, 이러한 결과는 의사결정 측면에서 활용이 어려운 실정이다. 이러한 점에서 본 연구에서는 유역을 공간적으로 상세화하여 하천을 네트워크 형태로 재구성, 실적기반 자료를 반영한 물순환 모델을 개발하였으며, 하천을 중심으로 모니터링 지점의 유량정보가 준실시간으로 제공될 수 있는 체계를 마련하였다. 본 연구에서 개발된 물순환 모델은 기존 물수지 분석에서 나타나는 문제점을 개선하는데 목적이 있으며, 계측유역을 대상으로 모형의 적합성을 평가한 결과 특히 저유량 부분에서 기존 모형에 비해 크게 개선된 효과를 확인할 수 있었다. 본 연구에서 개발된 물순환 모델은 보다 정확한 자연유량 보정기법 적용과 유역 내 상세화된 유역네트워크를 통해 유량정보를 준실시간으로 제공함으로써 보다 현실적인 가뭄 모니터링 및 가뭄대책을 마련하기 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• 한국물환경학회지
• /
• 제24권2호
• /
• pp.180-184
• /
• 2008

A distributed hydrologic model of an urban drainage area on Bugok drainage area in Oncheon stream was developed and combined with a optimization method to determine the optimal location and number of best management practices (BMPs) for storm water runoff reduction. This model is based on the SCS-CN method and integrated with a distributed hydrologic network model of the drainage area using system of 4,211 hydrologic response units (HRUs). Optimal location is found by locating HRU combination that leads to a maximum reduction in peak flow at the drainage outlet in this model. The results of this study indicate the optimal locations and numbers of BMPs, however, for more exact application of this model, project cost and SCS-CN reduction rate of structural facilities such infiltration trench and pervious pavement will have to be considered.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2006년도 학술발표회 논문집
• /
• pp.425-429
• /
• 2006

The understanding and prediction of the behavior of flow in open channels are important to the solution of a wide variety of practical flow problems in water resources engineering. Recently, frequent drought has increased the necessity of an effective water resources control and management of river flows for reserving instream flow. The objective of this study is to develop an efficient and accurate finite element model based on Streamline Upwind/Petrov-Galerkin(SU/PG) scheme for analyzing and predicting two dimensional flow features in complex natural rivers. Several tests were performed in developed all elements(4-Node, 6-Node, 8-Node elements) for the purpose of validation and verification of the developed model. The U-shaped channel of flow and natural river of flow were performed for tests. The results were compared with these of laboratory experiments and RMA-2 model. Such results showed that solutions of high order elements were better accurate and improved than those of linear elements. Also, the suggested model displayed reasonable velocity distribution compare to RMA-2 model in meandering domain for application of natural river flow. Accordingly, the developed finite element model is feasible and produces reliable results for simulation of two dimensional natural river flow. Also, One contribution of this study is to present that results can lead to significant gain in analyzing the accurate flow behavior associated with hydraulic structure such as weir and water intake station and flow of chute and pool.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2009년도 학술발표회 초록집
• /
• pp.827-831
• /
• 2009

Recently, frequency occurring flood and drought has increased the necessity of an effective water resources control and management of river flows. Therefore, the simulation of the flow distribution in natural rivers is great importance to the solution of a wide variety of practical flow problems in water resources engineering. However The serious problem facing two-dimensional hydraulic model is the treatment of wet and dry areas. The objective of this study is to investigate the wet and dry parameters that have direct relevance to model performance in situations where inundation of initially dry areas occurs. Several numerical simulations were carried out, which examined the performance of the marsh porosity method for the purpose of sensitivity analysis. Experimental channel and a variety of channel were performed for model tests. The results were compared with those of the observation data and simulation data of existing model. The RMA-2 model displayed reasonable flow distribution compare to the observation data and simulation data of existing model in dry area for application of natural river flow. As a result of this study, effectively applied marsh porosity method provide a reliable results for flow distribution of wet and dry area, it could be further developed to basis for extending to water quality and sediment transport analysis.

• 한국농공학회지
• /
• 제39권2호
• /
• pp.97-103
• /
• 1997

DO concentration in the aquatic system is important for the water quality management perspective. Water quality model uses available reaeration coefficient (K2) estimation equations in calculating DO, however, they might include inevitable uncertainty that the model output can be less reliable. In this study, the calibrated QUAL2E model for the Passaic River in New Jersey, U.S., was used to examine the effect of K2 estimation equation on the output DO concentration of the river. The model was run with six commonly used equations separately with all the other conditions remained same. The result showed that the output DO concentration profiles varied widely with different equations, and maximum difference was 4.96 mg/L for the same location which is unacceptably large. It implies that the development of reliable equation is required for proper water quality management. The unreliable model output can lead to a wrong decision in water quality management such as unnecessarily high or too low treatment of wastewater, which will cause serious effect on the community economically and socially in either case. Generating more reliable model output with slight investment to develop a site specific K$_2$ equation can improve the decision making process significantly and is highly recommended.

• Environmental Engineering Research
• /
• 제21권2호
• /
• pp.171-179
• /
• 2016

This study analyzes guidelines to select optimum number of grids to represent behavior of a given water system appropriately. The EFDC model was chosen as a 3-D hydrodynamic and water quality model and salt was chosen as a surrogate variable of pollutant. The model is applied to an artificial canal that receives salt water from coastal area and fresh water from a river from respective gate according to previously developed gate operation rule. Grids are subdivided in vertical and horizontal (longitudinal) directions, respectively until no significant changes are found in salinity concentrations. The optimum grid size was determined by comparing errors in average salt concentrations between a test grid systems against the most complicated grid system. MSE (mean squared error) and MAE (mean absolute error) are used to compare errors. The CFL (Courant-Friedrichs-Lewy) number was used to determine the optimum number of grid systems for the study site though it can be used when explicit numerical method is applied only. This study suggests errors seem acceptable when both MSE and MAE are less than unity approximately.