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낙동강 중류 보 구간에서의 시,공간적 수질 분포 특성 연구
나은혜 ( Eun Hye Na ),박수영 ( Suyoung Park ),김종하 ( Jongha Kim ),임성수 ( Seongsoo Im ),김경현 ( Kyunghyun Kim ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.6
We investigated the spatial and temporal patterns of water quality in the Gangjung-Goryoung weir that is located in the middle area of the Nakdong river, Korea. The monitoring results indicated that there are discernible vertical differences in water quality during the pre- and post-monsoon periods (May to September). During this period, it was observed that the weak thermal stratification formed at the maximum level, and pH, Chl-a, and DO concentrations in the surface layer were higher than those in the bottom layer. This vertical difference was especially noticeable for DO concentrations: there were DO depletions at the bottom layer in late June to early August. During the summer monsoon period with heavy rainfall, there was a decline in vertical differences in water quality. From this study, it was suggested that continuous monitoring of vertical profiles could become a useful tool for identifying the spatial and temporal distributions of water quality and for developing the best management policy for water quality in the Nakdong river.
효율적 리셋 기법을 이용한 VSS-SA기반 적응 푸리에 분석 알고리즘
나은혜(Eun-Hye Na),김진(Jin Kim),남상원(Sang-Won Nam) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
This paper proposes an adaptive Fourier analysis algorithm using VSS-SA robust against impulsive noise along with an efficient reset method. Specifically, for the adopted reset method in the proposed algorithm, the error variance estimates obtained for the step-size update are reused to set the control variable without employing additional variables. Computer simulation results show that the proposed algorithm requiring lower computational complexity yields the same robust convergence performance for adaptive Fourier analysis as the conventional algorithm.
로그선형모델을 이용한 팔당호 유입지류 수질의 연속성 시뮬레이션과 경향 분석
나은혜 ( Na Eun Hye ),박석순 ( Park Seog Sun ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.3
Two types of statistical models, simple and multivariate log linear models, were studied for continuity simulation and trend analysis of water qualities in incoming flows to Lake Paldang. Water quality is a function of one independent variable(flow) in the simple log linear model, and of three different variables (flow, time, and seasonal cycle) in multivariate model. The independent variables act as surrogate variables of water quality in both models. The model coefficients were determined by the monthly data. The water qualities included 5-day Biochemical Oxygen Demand(BOD_(5)), Total Nitrogen (TN), and Total Phosphorus(TP) measured from 1995 to 2000 in the South and the North branches of Han River and the Kyoungan Stream. The results indicated that the multivariate model provided better agreements with field measurements than the simple one in all attempted cases. Flow dependency, seasonality, and temporal trends of water quality were tested on the determined coefficients of the multivaariate model. The test of flow dependency indicated that BOD concentrations decreased as the water flow increased. In TN and TP concentrations, however, there were no discernible flow effects. From the temporal trend analyses, the following results were obtained: 1) no trends on BOD at all three upstreams, 2) increase on TN at the South Branch and the Kyoungan Stream, 3) decrease on TN at the North Branch, 4) no trends on TP at the North and the South Branches and 5) increase on TP at the Kyoungan Stream by 3 to 8% per years. The seasonality test showed that there were significant seasonal variations in all three water qualities at three incoming flows.
연구논문 : 실시간 낙동강 흐름 예측을 위한 유역 및 수체모델 결합 적용 연구
나은혜 ( Eun Hye Na ),신창민 ( Chang Min Shin ),박란주 ( Lan Joo Park ),김덕길 ( Duck Gil Kim ),김경현 ( Kyung Hyun Kim ) 한국물환경학회(구 한국수질보전학회) 2014 한국물환경학회지 Vol.30 No.1
A combined watershed and receiving waterbody model was developed for operational water flow forecasting of the Nakdong river. The Hydrological Simulation Program Fortran (HSPF) was used for simulating the flow rates at major tributaries. To simulate the flow dynamics in the main stream, a three-dimensional hydrodynamic model, EFDC was used with the inputs derived from the HSPF simulation. The combined models were calibrated and verified using the data measured under different hydrometecological and hydraulic conditions. The model results were generally in good agreement with the field measurements in both calibration and verification. The 7-days forecasting performance of water flows in the Nakdong river was satisfying compared with model calibration results. The forecasting results suggested that the water flow forecasting errors were structures such as upstream dams and weirs. From the results, it is concluded that the combined watershed-waterbody model could successfully simulate the water flows in the Nakdong river. Also, it is suggested that integrating real-time data and information of dam/weir operation plans into model simulation would be essential to improve forecasting reliability.