• 환경영향평가
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• 제20권1호
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• pp.89-96
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• 2011

This study was carried out to assess the variations of water quality caused by the dam construction on the river. Six dams-Yongdam, Miryang, Hoengseong, Boryeong, Jangheung and Buan- constructed recently in Korea were selected for the study. Chemical oxygen demand(COD) was increased in the initial stage of water storage at dams compared to the lotic(river) environment, but after 3 years it was maintained lower and stabilized concentrations. Five dams except for Jangheung Dam were maintained Ia~Ib grade conditions under the water quality criteria of Korea. The concentrations of total nitrogen(T-N) were decreased under the lentic(reservoir) environment compared to the river status. Total phosphorus(T-P) was decreased 13~63% at the reservoir condition. We concluded that increase of COD concentration was due to the debris organic materials of the land, but temporary phenomenon. T-N and T-P concentrations were decreased at the lentic condition compared to the lotic.

• 환경영향평가
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• 제13권5호
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• pp.251-262
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• 2004

In order to investigate the geochemical characteristics of surface sediments in lower Yeongsan river system, sediment samples from the main stream of Yeongsan river, Gomakwon and Hampyeong streams were collected and analyzed for grain size and metal and organic carbon contents. The sediment types of the streams widely vary from pebble to mud. The metal contents in the sediments are mainly dependent on grain size of the sediments, geology around the streams and organic matter contents from the domestic sewage. Enrichment factor (EF) representing the degree of metal contamination in the sediments are relatively low in the study area. But, high Zn and Pb values seem to be from the study area, partly.

• 한국물환경학회지
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• 제26권2호
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• pp.208-214
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• 2010

This study aimed at the introduction of desktop method for assessment of environmental flows developed by International Water Management Institute (IWMI) recently and its application to Geum river basin. This scheme simulated the influence on aquatic ecosystem caused by watershed development and in turn the decrease of water quantity keeping the river's own flow regime. It was found to be as very effective method although it had simple structure. Flow duration curves for different environmental classes at Sutong and Gongjoo sites were estimated according to the natural conditional scenario of Geum river basin and the results were relatively compared well with the previous studies. The behaviors of monthly average runoff time series of both sites showed the level of A class. The results of this study would provide the fundamental data to establish the future plans of monitoring or management for aquatic ecosystem of Geum river basin.

• 환경영향평가
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• 제17권4호
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• pp.255-262
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• 2008

For the Han-river estuary and DMZ where white-naped crane (Grus vipio; endangered migratory bird) stopover or spend winter, the habitat composition and the habitat use pattern of white-naped crane were analyzed with the position data obtained by the satellite tracking method. By the use of geographic information system (GIS), the percent composition of seven habitat categories of white naped-crane data points (n=228) was analyzed. The chi-square test showed that the white-naped crane habitat use pattern was significantly different (p<0.05) from that of random points (n=228). It means that white-naped crane select and use particular habitat area in the Han-river estuary and DMZ.

• Advances in environmental research
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• 제6권1호
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• pp.53-65
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• 2017

Assessment of seasonal changes in surface water quality is an important aspect for evaluating temporal variations of river pollution due to natural or anthropogenic inputs of point and non-point sources. In this study, surface water quality data for 15 physico-chemical parameters collected from 7 monitoring stations in a river during the years from 2014 to 2016 were analyzed. The principal component analysis technique was employed to evaluate the seasonal correlations of water quality parameters, while the principal factor analysis technique was used to extract the parameters that are most important in assessing seasonal variations of river water quality. Analysis shows that a parameter that is most important in contributing to water quality variation for one season may not be important for another season except alkalinity, which is always the most important parameters in contributing to water quality variations for all three seasons.

• 청정기술
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• 제29권3호
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• pp.227-234
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• 2023

근래 하천구역은 지자체의 여가 활용 공간 및 지역 축제장으로 인식되면서 개발압력이 크게 증가하고 있다. 하지만 하천구역의 고유 기능과 시설의 유지관리 및 훼손지 복원에 소모되는 시간과 비용을 고려한다면 개발계획은 매우 신중히 결정되는 것이 필요하다. 본 연구에서는 하천구역의 보전과 자연친화적인 공간활용을 유도하기 위해, 사업계획의 제도적 이행절차 중 하나인 환경영향평가의 개선에 대한 연구를 수행하였다. 연구는 환경영향평가 검토 가이드(안)의 마련을 목적으로 수행되었으며, 연구배경에 대한 이해와 목적달성을 위해 하천구역의 법·제도 현황, 개발계획 현황, 환경영향평가서 검토·협의의견 등의 조사결과를 포함하였다. 연구결과, 하천기본계획의 전략환경영향평가는 하천구역의 지구지정과 공간활용 범위 및 방향성을 계획하는 중요한 상위계획이므로, 향후 실시계획과 연계되는 소규모 환경영향평가 단계에서의 합리적인 평가를 위해 사업계획을 보다 면밀하게 수립하여 평가·검토하는 것이 필요한 것으로 도출되었다. 또한, 소규모 환경영향평가단계에서 입지적 특성을 고려한 친수시설 조성계획의 적정성 판단과 환경영향을 저감하기 위한 사항들이 반영될 수 있도록 환경영향평가 검토 가이드(안)을 마련하였다. 추후, 본 연구결과가 하천구역내 친수시설 조성계획 수립시 자연친화적인 개발의 지침 및 가이드로서의 기틀이 되기를 기대한다.

• 환경영향평가
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• 제8권2호
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• pp.95-107
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• 1999

The organic contents of reservoir sediment can offer a good indicator to events in history of lake life. Reservoir sediment have many information of the past and future fingerprint about development direction of life cycle in biological animals. So, in this study we made an effort to know the distribution of organic contents in Daecheong reservoir sediment. Items for this investigations are such as follows: Loss on ignition, COD, Organic carbon, TN, TP, heavy metal contents, Loss on ignitions were determined in 6.44~15.91% and COD were determined in 1.606~6.859%, organic carbon in 1,077~3.743%. Contents of TP and TN were in the range of 0.083~0.757%, and 0.645~0.926%, respectively.

• 한국환경과학회지
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• 제23권1호
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• pp.7-23
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• 2014

This study estimates unit for the nonpoint source(NPS), classified according to the existing Level-1(large scale) land cover map, by monitoring the measurement results from each Level-2(medium scale) land cover map, and verifies the applicability by comparison with previously calculated units using the Level-1 land cover map. The NPS pollutant loading for a basin is evaluated by applying the NPS pollutant unit to Dongcheon basin using the Level-2 land cover map. In addition, the BASINS/HSPF(Better Assessment Science Integrating point & Non-point Sources/Hydrological Simulation Program-Fortran) model is used to evaluate the reliability of the NPS pollutant loading computation by comparing the loading during precipitation in the Dongcheon basin. The NPS pollutant unit for the Level-2 land cover map is computed based on precipitation measured by the Sangju observatory in the Nakdong River basin. Finally, the feasibility of the NPS pollutant loading computation using a BASINS/HSPF model is evaluated by comparing and analyzing the NPS pollutant loading when estimated unit using the Level-2 land cover map and simulated using the BASINS/HSPF models.

• 환경영향평가
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• 제7권2호
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• pp.135-143
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• 1998

In order to study the general characteristics of reservoir and stream sediments, various analysis tests were conducted. Water contents and ignition loss were measured to know the primary sediment characteristics. The COD, total phosphorus and nitrogen were contained for the determination of organic substance content. For the purpose of establishing the contamination degree of heavy metals, some heavy metal contents were investigated. In heavy metal contents, reservoir sediments showed somewhat higer value than stream sediments. As a result, the reservoir sediment content of all analysis items were higher than stream sediment.

• 수산해양교육연구
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• 제17권2호
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• pp.155-169
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• 2005

The Pressure-State-Response (PSR) framework was used to develop sustainability indicators for the Han River estuarine area. A total of 37 indicators in three categories were derived after reviewing previous studies. Some of these indicators were selected to assess the sustainability of the Han River estuary and its watershed. Some indicators provided contrasting information for judging the sustainability of the area. Even though very limited information was available for the meaningful assessment of the sustainability of the Han River estuarine area, there seems to be an appropriate base for the sustainable development of the area. Securing of reliable information seems to be the key for the indicators to produce meaningful assessment of the implementation of the sustainable development strategy for the Han River Estuary and its watershed. Integrated indices to synthesize the information provided by the sectoral indicators need to be developed to overcome the limitations of the sectoral indicators.