• Proceedings of the Korea Water Resources Association Conference
• /
• 2017.05a
• /
• pp.317-321
• /
• 2017

본 연구는 황구지천 인접 지역의 홍수지도를 작성하기 위하여 황구지천 제방 파제시 홍수범람 모의를 실행하였다. 홍수범람모의에 적용한 수치모형은 FLUMEN이며 황구지천 세마교부터 수직교 구간 인접지역의 홍수범람을 모의하였다. 수치지형도에 의한 지형자료와 함께 조도계수 및 홍수수문곡선운 황구지천 관련 계획보고서의 자료를 인용하였다. 월류에 의한 범람 양상을 파악하기 위하여 확률홍수시 현 제방고를 적용한 초기 침수 빈도를 적용하였다. 범람시나리오를 작성하기 위하여 2개의 파제위치를 선정한 후 범람 모의를 수행하였다. FLUMEN은 미리 제방을 파제한 후 처오름 해석으로 모의하는 방법과 하도에 물이 가득 찬 후 제방을 파괴하는 방법이 있으며 본 연구에서는 전자의 방법을 적용하였다. 제방의 범람에 따른 침수시간, 유속분포의 변화, 침수심, 침수면적 등을 산정하고 제방의 파제에 따른 침수시 파제폭에 관한 변화를 주어 범람면적의 변화 및 시간의 변화 수문곡선상 문제점을 검토하여 해당지점의 적정한 파제폭, 침수심, 침수시간 등을 제시하여 홍수지도 작성시 필요한 자료를 제시하였다.

• Journal of Wetlands Research
• /
• v.21 no.1
• /
• pp.77-83
• /
• 2019

Stream water qualities have been predicted in the year 2002 and 2014 through providing the Hwangguji Stream Rectification Plan. However, the reliability of result for predicted water quality was relatively lower by applying conventional values of the parameters in model. In this study deoxygenation coefficients between Sema bridge(HGJ2) and Sujik bridge(HGJ3) have been evaluated based on the observed data of water quality and travelling time to compare with the applied value of coefficients in predicting water quality model. The values of deoxygenation coefficient $0.078day^{-1}{\sim}0.748day^{-1}$ for normal period and $0.053day^{-1}{\sim}0.505day^{-1}$ for drought period have been calculated based of observed data between Sema bridge and Sujik bridge. The values of coefficients $0.02day^{-1}{\sim}3.4day^{-1}$ have been applied in predicting water quality model in the year 2002 and $0.043day^{-1}$ 2014. Thus, the simulated results of stream water quality were better than the observed data in 2002, and worse in 2014. It has shown that values of deoxygenation coefficient should be properly estimated based on observed data to predict proper stream water quality by model.

• River and Culture
• /
• v.9 no.4
• /
• pp.96-104
• /
• 2013

• Journal of Wetlands Research
• /
• v.7 no.3
• /
• pp.57-66
• /
• 2005

This paper is to present the determination of the optimal loss rate parameters and unit hydrographs from the observed single rainfall-runoff event using optimization model. The linear program models has been formulated to derive the optimal unit hydrographs and loss rate parameters for the site of the Su-Jik Bridge in the HwangGuJichen River; one minimizes the summation of the absolute residual between predicted and observed runoff ordinates. In the perturbation stage of parameters the trial and error method has been adopted to determine the loss rate parameters for Kostiakov's, Philip's, Horton's, and Green-Ampt's equation. The unique unit hydrograph ordinates for a given rainfall-runoff event is exclusively obtained with ${\Phi}$ index, but unit hydrograph ordinates depend upon the parameters for each loss rate equations. In this paper the single rainfall-runoff event observed from the sample watershed is considered to test the proposed method. The optimal unit hydrograph obtained by the optimization model has smaller deviations than the ones by the conventional method.

• Korean Journal of Environmental Agriculture
• /
• v.1 no.2
• /
• pp.116-122
• /
• 1982

Investigation on the water quality of Hwangguji River and experiment on the effects of nitrogen and soil improvements were carried out in the paddy field irrigated with polluted water of the river. The obtained results are as follows: 1) Amount of COD and $NH_4-N$ in water of the river were 54 ppm, 65 ppm, during the seeding time, and were 52 ppm, 512 ppm during the transplanting time respectively. Their concentrations were over the standard levels. It seemed that the water pollution was mainly caused by organic waste matters. 2) It seemed that the effective nitrogen level was $7{\sim}8$kg/10a in the paddy field irrigated with polluted water of the river. 3) The rice yields of potassium twice quantity application plot with N.P.K. fertilizer, the calcium application plot with N.P.K. fertilizer and the combined plot with potassium, wallarstonite, calcium and fresh straw, were increased 4, 5 and 8%, respectively, than that of the N.P.K. fertilizer standard level plot.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2017.05a
• /
• pp.385-385
• /
• 2017

지하수 관정의 위치에 따라 대수층과 인근 하천의 수리특성이 다양하여 하천수량에 미치는 지하수 양수의 영향이 공간적으로 다르게 발생하며, 그 영향을 지도(map)상에 표출한 것을 가칭 지하수 양수 영향구역도(국토교통부, 2014)라 한다. 본 연구에서는 황구지천 하류유역에 대해 하천주변 천부대수층 지하수 양수에 따른 하천수 감소량을 Hunt(1999, 2009)의 해석해로 산정하고 그 결과를 바탕으로 지하수 양수 영향구역도를 작성하였다. 지하수 양수 영향구역도 작성에 필요한 입력자료를 구축하기 위해서 현장에서 직접 양수시험을 수행하여 대수층 수리상수를 산정하고 기존 문헌값을 함께 이용하여 수리상수의 공간분포도를 작성하였다. 또한 양수시험공에 인접한 하천의 바닥에 피조미터 및 시피지미터를 설치하여 하상수리전도도를 측정하였다. 하천주변 및 하상의 수리상수값을 Hunt 해석해에 대입하여 지하수 양수량 대비 하천수 감소율을 30m 크기의 셀 단위로 산정하고 이를 구글어스상에 공간적으로 표출하였다. 하천구역에서 300m 이내 지역에서 지하수를 양수할 경우에는 양수기간 5년동안 평균적으로 양수량의 70%를 초과하는 하천수량의 감소가 일어나는 것으로 분석되었다. 지하수 양수 영향구역도를 활용하면 지하수 개발 이용자 및 허가 관련 행정기관이 지하수 관정의 공간적인 위치에 따른 하천수 감소 정도를 정량적으로 쉽게 파악할 수 있다.

• Journal of the Korean association of regional geographers
• /
• v.10 no.2
• /
• pp.300-312
• /
• 2004

The geomorphological environment of Suwon Basin consists of two great elements: mountains which surround the basin and plains and low relief hills by differential erosion of granitic area. Nothern and eastern parts of the basin surround with gneissic mountains(Mt. Kwangkyo), southern and western parts of the basin with granitic mountains(Mt. Chilbo, etc). The basin developed on granitic saprolites is composed of two types of sub-order geomorphic elements: flood plains alongside four river(Whangkuji-chon, Seoho-chon, Suwon-chon, Wonchonri-chon) and aligned hills and mounts between the river side plains. While the low down lands provided the spatial condition for the extention of downtown of Suwon, the gneissic mountains have played the positive roles by high ecological dam effects with stable supply of water and purification of air, etc.

• Journal of Wetlands Research
• /
• v.11 no.1
• /
• pp.65-73
• /
• 2009

We investigated characteristics of channel morphology, flora and vegetation distribution at the main and the abandoned channels of the Hwangguji Stream and the Cheongmi Stream. The analysis of aerial photographs and old topographical maps showed that the abandoned channels were made by cut-off from the main channel due to the construction of artificial levee. The total number of species and percentage of exotic plants at the main channels were higher than those at the abandoned channels. At the abandoned channel, the percentage of species number of hydrophytes and hygrophytes was higher than those at the main channels in the both stream. The results of principal component analysis (PCA) showed that the floral structure between at the main and the abandoned channel was more similar in the Hwangguji Stream than that in the Cheongmi Stream. The relative distribution areas of hydrophytes and hygrophytes at two abandoned channels were much higher than those at the main channels in the both stream. The dominant plant was an emergent macrophyte, Zizania latifolia at two abandoned channels. Therefore, flora and vegetation at the abandoned channel showed more hydric and lentic characteristics and provided diversity on the landscape level.

• Journal of Korean Society of Environmental Engineers
• /
• v.39 no.12
• /
• pp.655-663
• /
• 2017

It is difficult to manage hotspot area and to establish the reduction plan considering with spatial-distribution on Korea TMDLs (Total Maximun Daily Loads) system. To solve this problems, methods of Load Duration Curve (LDC) using long-term flow and water quality data, and spatial-analysis were applied on present TMDLs. Jinwi A watershed which is enforced TMDLs plan were selected to study area. Results of application of suggested methods in this study to Jinwi watershed, Hwangguji tributary was selected to hotspot area and Jinwi tributary was exclued. Also, middle area of Hwangguji tributary was needed a reduction plan for the protection of non-point source pollution. In downstream area, livestock manure should be managed additionally. The new methods suggested in this study were useful to increase healthiness for total watershed.

• Journal of Environmental Impact Assessment
• /
• v.27 no.6
• /
• pp.704-716
• /
• 2018

The aim of this study is to examine the characteristics analysis of the discharge and water quality based on TPLMS (Total Pollution Load Management System) in the Jinwi River unit basin, and to propose a management plan by selecting the point that needs improvement of water quality in order to achieve the target water quality. We evaluated the discharge and water quality characteristics, statistical analysis, daily delivery load and daily delivery density, grade classification, for 14 total pollution load site's from 2014 to 2016 year in Jinwi river unit basin. The average discharge of Jinwi river unit basin is $22.411m^3/s$ and discharge of Hwangguji River is 32.8% and the water quality characteristics along the tributary river were clarified spatially. As the result, it was analyzed that Seongeun River is an indirect indicator of organic pollutants, Gwanri River is a seasonal factor, Osan River and Hwangguji River both affect water quality. Estimation of delivered pollutant loads at the HG-3 site was 6,470.4 BOD kg/day, 6,846.7 TN kg/day and delivered pollutant loads density increased to $220.9BOD\;kg/day/km^2$, $22.4TP\;kg/day/km^2$ at the HG-4 site. This result demonstrates that the total pollution load site needed to improve water quality of the Jinwi River unit basin was HG-3 site.