• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.2037-2041
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• 2008

댐의 상류에서 유입되는 하천수는 상수원수의 수질농도와 직결되기 때문에 보다 심도 있는 수질관리가 필요할 것이다. 본 연구에서는 댐 상류에 위치한 저수지와 하천에서의 수질해석을 위해 WASP 모형을 사용하여 수질해석을 실시하였다. 대상구간은 강원도 횡성군의 남한강 제1지류인섬강에 위치한 횡성댐 상류 계천의 매일수위국에서부터 횡성호 구간인 13.9km에 대해 적용하였다. 이를 위해 2005년 1월부터 2006년 6월까지 매일수위국을 비롯한 주요 지점에서 측정된 수질자료를 이용하여 WASP 모형에 대한 부정정 수질모의를 실시하였으며, 이를 실측자료와 비교하여 모형에 대한 정확성을 검증하였다. 또한 하천 수질해석에 널리 사용되는 QUAL2E 모형을 대상구간에 적용하여 WASP 모형의 모의결과와 비교하여 적용성을 검토하였다.

• Magazine of the Korean Society of Agricultural Engineers
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• v.44 no.2
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• pp.148-160
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• 2002

Lake water quality assessment information is useful to anyone involved in lake management, from lakeshore owners to lake associations. 11 provides lake water quality, which can improve how to manage lake resources and how to measure current conditions. It also provides a knowledge base that can be used to protect and restore lakes. SWMM was applied to simulate the discharge and pollutant loads from Boryeong watershed, and WASP5 was applied to analyze the changes of water quality in Boryeong freshwater lake. In each model, the most suitable parameters were calculated through sensitive analysis and some parameters used default data. Simulated in SWMM and measured discharge showed the accuracy of 88.6%. T-N and T-P exceeds the criteria in the simulation of water quality in Boryeong freshwater lake, and control of pollutant loads in the main stream showed the most effective way. Integrated water quality management system was developed to give convenience in the operation of SWMM and WASP5 and data acquisition.

• Journal of Environmental Impact Assessment
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• v.19 no.5
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• pp.465-473
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• 2010

This study was carried out to investigate the effect of EFDC hydrodynamic result on the WASP7.3 water quality modeling result in accordance with the change of number of grid for the dam reservoir to be constructed. The simulated flow and BOD, T-N and T-P loads by the HSPF watershed model was used for boundary conditions and the hydrodynamic modeling results was linked with WASP model to predict future water quality after dam construction. The scenarios for EFDC modeling were composed of Scenario 1(141 grid cells) and Scenario 2(568 grid cells). The results of Scenario 2 showed that BOD, T-N, T-P and Chl-a concentrations were decreased 0.073mg/L(8.5%), 0.032mg/L(2.6%), 0.003mg/L(6.8%), 0.644mg/L(4.2%) compared with those of Scenario 1, respectively. As number of grid cell increased, water quality concentrations were decreased and also it caused the longer running time. Therefore, this study suggests that the consideration of the geometry of water body is more important than the number of grid cells for the prediction of water quality of a dam reservoir in EIA.

• Journal of the Korean GEO-environmental Society
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• v.7 no.6
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• pp.57-65
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• 2006

In this study, WASP6 was used to predict the water quality of the reservoir and the lake. This can help the managers make the right choice of water quality policy. The results through studying are below. Raw pollutant load caused by the tourists in pollutant load of the study area takes 91.66% and 92.75% in total amount T-N, T-P. It showed high value when compared to raw pollutant load by land and stock farm and it seems that the main contamination is the population of tourists. From the result of the prediction model, BOD will increase about 1.5 times, T-N and T-P will be 1.5 times in 2012. It means that some counter plan is needed to reduce pollutant load. Enviroment grade of Suokjeong reserver is in I~II grade which is in good condition comparatively. However, the water contamination will be in poor as the year passes. when considering T-N T-P, which are the nutrients to control eutrophication, the concentrated administration about contamination sources is in urgent.

• Journal of Environmental Impact Assessment
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• v.23 no.6
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• pp.432-444
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• 2014

When the water quality modelling is done with a manual calibration, it is possible that the researcher's opinion may affect the objectivity of the research. Hence, the role of the automatic calibration is highly important. This research applies a technique to automatically calibrate the water quality parameters by implementing an optimization method. This involves estimating the optimum water quality parameters targeting influential parameters towards the lake's BOD, DO, Phosphorus, Nitrogen and Phytoplankton. To accurately calculate the water temperature and hydraulic characteristics of a deep, stratifying lake, EFDC, a 3-dimensional hydraulic model which can be linked to the WASP7 was applied. With EFDC, the segment of the lake is formed and utilized as an input data of the WASP7. For the calibration of the water quality parameters of the WASP7, an influence coefficient algorithm and a genetic algorithm was applied. Of the five water quality variables for calibration, the normalized residuals of the observed and calculated values of DO, TN, CBOD were relatively small and the three water quality variables were calibrated properly. Yet the accuracy of the calibration of TP and Chl-a was relatively low.

• Korean journal of applied entomology
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• v.2
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• pp.47-54
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• 1963

The chestnut gall wasp, Dryocosmus kuriphilus $Y^{ASUMATSU}$, has been recently distributed and chestnut trees have teen seriously damaged by this insects in Korea. However, this insect pest has not been investigated in Korea. This paper gives an account of field and Laboratory observations on the seasonal occurrence and the life history of the chestnut gall wasp, and the damage of the chestnut trees by. its insects. This study was carried out at Chungchungpukdo, Kangwon-do and Kyungi-do in Korea, from 1961 to 1963, inclusive. 1. The Chestnut gall wasp (Dryocosmus kuriphilus $Y^{ASUMATSU}$) has one generathion per year and females are only known. 2. The adult wasps were observed from late June to late July with peak of wasp emergence about early and middle July. Most of new adult wasps were coming out from, the galls in the morning rather than the afternoon. 3. Each wasp produced auerage 198.5 eggs and about 4.89 eggs was observed in each bud of the chestnut tree. 4, The egg period of wasps was about 30 days and they were hatching from July to August. 5. The larval period of wasps were from middle of August to middle of next June and pupation took places about early June to middle of July. 6. The adult wasps were ovipositing into the buds and from early May next year, galls were growing. They caused stunting of growth and no fruiting or dying of the chestnut tries. 7. The first observation of the wasp was made at Chaechun of Chungchung-pukdo in 1958. Up to 1963 this insects are distributed in Kangwon-do, Kyunggi-do, north part of Chungchung-pukdo and north part of Kyungsangpukdo

• Journal of Korea Water Resources Association
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• v.44 no.6
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• pp.439-447
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• 2011

This study aims to test the feasibility of combined use of EFDC (Environmental Fluid Dynamics Code) hydrodynamic model and WASP7.3 (Water Quality Analysis Program) model to improve accuracy of water quality predictions of the Yongdam Lake, Korea. The orthogonal curvilinear grid system was used for EFDC model to represent riverine shape of the study area. Relationship between volume, surface and elevation results were checked to verify if the grid system represents morphology of the lake properly. Monthly average boundary water quality conditions were estimated using the monthly monitored water quality data from Korean Ministry of Environment DB system. Monthly tributary flow rates were back-routed using dam discharge data and allocated in proportion to each basin area as direct measurements were not available. The optimum number of grid system was determined to be 372 horizontal cells and 10 vertical layers of the site for 1 year simulation of hydrodynamics and water quality out of iterative trials. Monthly observed BOD, TN, TP and Chl-a concentrations inside the lake were used for calibration of WASP7.3 model. This study shows that EFDC and WASP can be used in series successfully to improve accuracy in water quality modeling. However, it was observed that the amount of data to develop inflow water quality and flow rate boundary conditions and water quality data inside lake for calibration were not enough for accurate modeling. It is suggested that object-oriented data collection systems would be necessary to ensure accuracy of EFDC-WASP model application and thus for efficient lake water quality management strategy development.

• Parasites, Hosts and Diseases
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• v.52 no.6
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• pp.681-684
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• 2014

Hymenoptera stings can cause serious injury to humans. We report the clinical findings of 6 cases of Hymenoptera stings. All patients developed painful erythematous papules at the sting sites and had a past history of parasitoid wasp sting. This is the first clinical report of the parasitoid wasp, Cephalonomia gallicola, causing human stings in Korea.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.439-439
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• 2018

충주호는 충청권의 생 공 농업용수로 이용되는 광역상수원이며, 2016년 기준 연간 약 3만6천톤이 방류되어 남한강 전체 수질에 큰 영향을 미친다. 현재 충주호는 상류 유역의 오염원이 적게 분포하여 1급수의 수질기준을 만족하고 있으나, 상류 유역의 개발로 오염원 유입이 증가할 경우 호소 내 수질 및 남한강 전체 수질에 악영향을 미칠 수 있다. 따라서 충주댐 상류 유역의 오염부 하량 변화에 따른 수질변화를 예측하고, 현재수질 유지를 위한 허용 오염부하량을 산정할 필요가 있다. 한편, EFDC-WASP 연계모델은 수리학적 계산을 보다 정확하게 할 수 있는 동시에 이를 수질모델에 사용할 수 있어 다수의 연구자들에 의해 호소의 수질 모델링이 이루어졌으며 적용성이 많이 검증되었다. 본 연구에서는 EFDC-WASP 연계 모형을 이용하여 충주댐 상류유역의 배출부하 변화에 따른 호내 수질특성 변화를 분석하고자 한다. 모의구간은 충주댐의 유입지점부터 방류지점까지로, 수치해석을 위한 격자망은 총 800여개의 격자로 구성하였다. 수위자료는 한강홍수통제소에서 제공하는 충주댐 수위자료를 사용하였으며, 수질자료는 환경부 호소 측정지점인 충주호1,2,3 의 자료와 하천 측정지점인 제천A과 한강B의 자료를 사용하였다. 모의기간은 2013-2015년으로 2013년은 모델의 안정기로, 2014년은 보정, 2015년은 검정에 각각 활용하였다. 보검정된 모델을 활용하여 유입부하량 변화에 따른 수질변화를 모의하였고, 1급수 수질을 만족하는 허용부하량을 도출하였다. 본 연구의 방법은 향후 호소 상류유역의 개발에 따른 수질변화 예측과 허용부하량 산정에 활용할 수 있을 것으로 기대된다.

• Journal of Environmental Science International
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• v.18 no.6
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• pp.683-690
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• 2009

The water quality of reservoir can be controled by water quality prediction model because it can not only grasping the present water state but also predicting the water quality in future. In this study, WASP model is used to predict the water quality of Chungju reguration reservoir. This model has some special option which predicts the pollutant outflow phenomenon caused by the contamination sources. So this model is widely used because that can present the scientific basis in this field. This model can help the managers make the right choice of water quality policy. Environmental grade of Chungju reguration reservoir is in III,IV grade which is in bad condition comparatively. The water contamination will be in poor as the year passes. When considering T-N, T-P which are the nutrient to control eutrophication, the concentrated administration about contamination sources is in urgent.