• 물과 미래
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• 제24권1호
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• pp.83-92
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• 1991

본 연구는 금강유역의 주요수위표 지점에서 하천유지유량을 산정하는데 그 목적이 있다. 하천유지 유량을 산정하는 방법에는 수요적인 측면과 공급적인 측면 두가지로 분류할 수 있다. 본 논문에서 하천유지유량의 개념은 평균갈수량과 환경보존유량중 큰 값으로 결정하였다. 하천유지유량의 산정에서 대청댐 상류지역은 평균갈수량으로, 대청댐 하류지역은 평균갈수량과 QUAL2E 모형으로 산정된 수질보전유량값 중 큰 값을 하천유지유량으로 결정하였다. 그 결과 대청댐 하류인 공주와 규암지점 모두 평균갈수량 값이 크게 나타났으며 그 값은 공주지점에서 33.82$m^3$/sec, 규암 지점은 51.51$m^3$/sec 이였다. 그러므로 금강유역의 하천유지유량의 산정은 평균갈수량으로 결정하는것이 타당하다고 판단되었다.

• 환경정책연구
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• 제6권2호
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• pp.47-70
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• 2007

최근 들어 환경생태의 중요성 인식과 풍요롭고 환경적으로 안정된 생활을 영위하고자 하는 국민들의 욕구가 증대하고 있다. 이에 따라 물을 대하는 국민의 요구도 수질 및 수량관리에서 한 걸음 더 나아가 하천의 생태계를 보전하고 하천의 정상적인 기능을 회복시켜 건전한 하천환경 유지에 대한 수요도 증가하고 있다. 이러한 국민의 요구에 부응할 수 있도록 환경유량에 대한 개념을 정립하여 하천관리는 환경유량과 연계하여 취수를 허락하고, 자연에 가깝게 생태계를 보전하고 관리하여야 한다. 우리나라에서 환경유량은 하천관리 측면에서의 하천유지용수 개념으로 도입되었다. 우리나라에서 하천유지용수 산정은 아직도 인간 위주의 용수이용기능을 중점적으로 고려한 것으로 순수한 환경유량의 의미로서 환경생태적 관점에서 정의되고 강조되지 못했다. 환경유량은 하천유지용수에서 더 발전하여 생태계의 건전성 유지에 강조를 둔 새로운 개념으로 전환되어야 한다. 즉, 환경유량은 하천의 기능과 하천이 가지는 본래의 가치를 유지하기 위해 필요한 유량으로 정의하고 이는 각종 경제활동 유지를 위한 용수 공급, 위락, 심미, 수질, 수력발전, 주운 등을 위한 용수와 동일가치 또는 그 이상에서 고려하여야 한다.

• 한국수자원학회논문집
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• 제54권11호
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• pp.849-862
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• 2021

지난 10년간 현대적인 하천 유지관리체계 구축을 위해 하천법령, 행정규칙, 업무 매뉴얼을 정비해오고 있으며, 현장지원을 위해 다양한 연구와 기술개발도 병행해 왔다. 이러한 가운데 기반시설관리법의 제정, 2020년 홍수피해 등을 계기로 하천 유지관리 체계의 재정비 및 강화가 다시 요구되는 시점이다. 본 연구는 하천 유지관리의 제도적·기술적 역량 강화를 위해 중요한 분야인, 정책, 연구개발, 계획, 기술 측면에서 발전방향을 제안하고자 하였다. 폭넓은 소통을 위해 산·학·연·관의 합동 토론회를 개최하여 쟁점사항을 논의하였고 참석자를 대상으로 설문조사를 실시하였다. 본 연구에서 수집한 의견은 향후 하천 유지관리 체계 재정립 시 법제도 개선, 연구개발사업 기획, 유지관리 계획 도입, 기술개발의 방향 정립 등에 있어 중요한 참고자료로 활용될 것으로 기대된다.

• 한국환경복원기술학회지
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• 제16권5호
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• pp.1-17
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• 2013

We researched the fauna restoration of 5 urban streams in Ulsan established as ecological streams by improving water quality and river environment. The fauna inhabitation were compared according to the conditions of geometrical feature such as river width, low-water channel width, ect and water quality, water volumn, inland and forceland. The Mugeo cheon has clearly shown the fauna restoration effects resulting from supplying sustainable maintenance water and wastewater treatments. In the Yaksa cheon, on the other hand, the restoration effects were low due to the inflow of wastewater and sledges in some part of stream ever though the improvement of water quality. The Yeocheon cheon was found to have disadvantage on the ecological inhabitations due to supplying the maintenance water with highly concentrated salinity. The fauna restoration effect of the Meongjeong cheon was low due to the inflow of wastewater to the down stream. Therefore by supplying the maintenance water and improving the connection to the Taehwa river at the estuary, better restoration effects could be observed. In the Cheokgwa cheon, which is almost a natural river, the ecological integrity of the fauna population has been maintained quite well. It was concluded that the project to transform urban streams into ecological streams should focus on not only keeping water volume and quality but also maintaining favorable conditions for the migration and settlement of animal species close to the natural state.

• 한국지형학회지
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• 제28권2호
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• pp.1-13
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• 2021

It is very important to secure sufficient river maintenance flow for the ecosystem, since the ecosystem in the downstream section of the dam is greatly affected by the stream maintenance flow from the dam. However, the amount of discharge from the Seomjingang Dam is decreasing year by year, this study estimated the ecological flow required for the downstream section of the Seomjingang Dam, which is known as the habitat of the endangered Acheilognathus somjinensis, in order to secure the river flow of the Seomjingang Dam. For this purpose, the proper discharge was calculated using the PHABSIM model, which is a hydrological survey and physical habitat simulation method, and the proper discharge of other fish species were also comprehensively reviewed. As a result of this study, the current river maintenance flow at the Seomjingang Dam partially satisfies the ecological maintenance flow including the Acheilognathus somjinensis in the downstream section of the Seomjingang Dam. However, this is recognized as the minimum discharge to maintain the ecology in the downstream section of the Seomjingang Dam, and it would be more desirable to secure larger river maintenance flow than this. This study can contribute the determination of the river maintenance flow of the Seomjingang Dam by proposing the river maintenance flow considering the fish habitat environment in the river.

• 한국환경과학회지
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• 제23권4호
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• pp.723-735
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• 2014

Sediment discharge by long-term runoff in the Nakdong River watershed should be predicted for the maintenance and management of the Nakdong River newly changed by the four major river restoration project. The data establishment by the analysis of runoff and sediment discharge using the long-term watershed model is necessary to predict possible problems by incoming sediments and to prepare countermeasures for the maintenance and management. Therefore, sediment discharges by long-term runoff in the main points of the Nakdong River were calculated using SWAT(soil and water assessment tool) model and the relations and features between rainfall, runoff, and sediment discharge were analyzed in this study. As a result of sediment discharge calculation in the main points of the Nakdong River and tributaries, the sediment discharge at the outlet of the Naesung Stream was greater than the Jindong Station in the Lower Nakdong River from 1999 to 2008 except the years with low precipitation. The sediment discharge at the Nakdong River Estuary Barrage (NREB) was corresponding to 20% of the Jindong Station which is located about 80 km upstream from NREB.

• 한국물환경학회지
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• 제31권1호
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• pp.35-41
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• 2015

This study focuses on whether a physical habitat model, River2D, is useful to assess and design stream restoration. To achieve the aim, the habitat suitability for Zacco Platypus was analyzed using River2D at midstream of the Anyang-Cheon through modifying the low flow channel and changing the flow discharge. The River2D simulation results show that the inhabited environment for Zacco Platypus is improved by increasing the sinuosity of the low flow channel, and vice versa. Also the inhabited environment for Zacco Platypus gets worse when there is no additional flow for maintenance water supply at the stream flowing through cities. In this respect, the physical habitat simulation study based on the River2D model is useful because it provides a practical guidance in designing stream restoration.

• 상하수도학회지
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• 제12권3호
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• pp.81-90
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• 1998

The purpose of this study was to analyze the effect of the groin which was constructed in the down stream of urban river for the prevention of sedimentation on the improvement of the water quality. We studied on the groin in the downstream of Taehwa River constructed to keep the navigation depth of Ulsan day, and used the measured data of the water quality and river discharge. In order to analyze the charge of the water quality due to the groin Que12E model was applied, and BOD and DO was examined. The analysis showed that removal of the groin would not have significant effect on the improvement of the water quality, rather, interception of the pollution source coming into the upstream of the groin would be more influential on the improvement of the water quality. Therefore, It was concluded that to improve the water quality in mild bottom slop of tidal river, interception of the pollution source and river maintenance discharge should precede.

• Structural Monitoring and Maintenance
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• 제6권2호
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• pp.85-101
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• 2019

The effects of foundation scour depth and riverbed condition on the natural frequencies of a typical cross-river integral abutment bridge have been studied. The conventional operational modal analysis technique has been employed in order to extract the modal properties of the bridge and the results have been used in the Finite Element (FE) model updating procedure. Two tests have been carried out in two different levels of water and wet condition of the riverbed. In the first test, the riverbed was in dry condition for two subsequent years and the level of water was 10 meter lower than the natural riverbed. In the second test, the river was opened to water flow from the upstream dam and the level of water was 2 meter higher than the natural riverbed. The results of these two tests have also been used in order to find to what extend the presence of water flow in the river and saturation of the surrounding soil affect the bridge natural frequencies. Finally, the updated FE model of the bridge has been applied in a series of parametric analyses incorporating the effect of piles' relative scour depth on the bridge natural frequency of the first four vibration modes.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.515-520
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• 2005

The objective of the study is to assess the water quality improvement resulted from the rearrangement of the irrigation water supply systems at Mankyeong River and Ansung Chun basin. There is a mixed type of watershed composed of urban and rural areas in the region. From the water quality analysis, showed high T-N, T-P concentration in Ansung chun and Mankyeong river caused by paddies separated widely around Ansung chun and Mankyeong river and by runoff of the pollution from the Ansung and Jeonju city. but the upstream of the river showed clean water quality, so if we use the upstream water as river maintenance water for water quality improvement, it is expected to be positive effect for rural environmental aspect.