• 농업과학연구
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• 제36권1호
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• pp.99-109
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• 2009

논산시의 논산천 도심구간의 하천유지유량을 확보하기 위해 상류의 계룡지, 경천지, 대둔지와 탑정지 등을 증고하여 저수량을 확보하는 시나리오별로 상류의 저수지 군을 직렬, 병렬 연계 운영을 고려하여 논산 지점의 유량을 1966년부터 2007년까지 일별로 모의하여 유황을 분석하고 유지유량의 증가 효과를 분석한 결과는 다음과 같다. 첫째, 유역 내 하천유량의 관측자료가 없어 유입량을 DAWAST 모형에 의하고 관개용수를 공급할 때 탑정지의 저수량 변화를 모의하여 관측-모의의 저수량 오차를 목적함수로 함으로써 모형 매개변수를 구해 적용한 결과 Nash-Schcliffe 모형효율은 0.661, 관측-모의 저수량의 등가선의 결정계수는 0.666로 되는 모형의 검증을 거쳐 저수지 유입량, 하천유량 모의에 사용하였다. 둘째, 계룡지 2 m, 5 m, 대둔지 5 m, 탑정지 1 m 등을 증고하는 시나리오를 설정하였고, 상류 저수지에 의한 저수량 확보 시나리오별로 단일 및 연계 저수지 운영을 모의한 결과 하천유지유량을 연평균 최대 59.85백만 $m^3$까지 공급할 수 있는 것으로 분석되었다. 셋째, 논산 지점의 하천 유황은 갈수량 기준으로 저수지를 증고하지 않은 현재 상태는 $1.086m^3/s$이었으나 대둔지가 준공되면 $1.809m^3/s$로 증가되고, 계룡지를 2 m, 5 m로 증고하면 각각 $1.841m^3/s$, $1.862m^3/s$로 증가되고, 추가로 탑정지를 1 m 증고하면 각각 $1.978m^3/s$, $2.011m^3/s$로 증가되고, 추가로 대둔지를 5 m 증고하면 각각 $2.183m^3/s$, $2.218m^3/s$ 증가되는 것으로 분석되었다. 요약하면 계룡지를 2 m, 대둔지를 5 m, 탑정지를 1 m 각각 증고하여 17.132백만 $m^3$의 저수량을 추가로 확보함으로써 논산 지점의 하천유지유량을 현재의 2배 정도로 증가시킬 수 있다는 결과를 얻었다.

• 한국물환경학회지
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• 제36권5호
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• pp.445-452
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• 2020

Tributary is a part of life space for people and a very important place that accommodates rest recreation and other daily activities. absolutely insufficient basic data about water quality and flow rate are available for basin management. Efficient water and basin management systems, which are also supported by local residents can be established by securing such basic data of major tributaries in the Nakdong river system. In this study, the fluctuation characteristics of upstream and downstream water pollution levels were compared using the measurement results of the water environment measurement network and the tributary monitoring project for the gyeseong-stream and Hwapo-stream in the Nakdong-miryang watershed. In 2017, when water pollution is the highest, it was confirmed that the annual average rainfall was the lowest. Although the upstream and downstream water quality tendencies of the Gyeseong-stream are similar, the water quality concentrations of the Gyeseong-stream are relatively different. But although the Hwapo stream has various causes of pollution, there was not much difference in the level of pollution between the upper and lower streams. In addition, both rivers need the ability to purify rivers by securing sufficient water for river maintenance, and if the correlation between water quality items can be inferred through continuous monitoring of tributaries where the aspect of water quality change is unclear, water quality management Determined to be efficient operation.

• 한국환경과학회지
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• 제16권5호
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• pp.649-655
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• 2007

This study was focused on estimating instream flow, and its optimal alternative for securing the required total amount of instream flow was also researched in order to restore ecosystems and riverine aesthetics of the Mugeo Stream. the first tributary of the Taewha River flowing through the center of Ulsan. In this study the hydraulic and hydrologic conditions and water quality were investigated at specific channel reaches and representative stations of the Mugeo Stream to determine a proper estimate of instream flow. And riverine functions, such as the minimum flow, water duality conservation, fish habitat, and recreation, were considered to restore the environmental functions of the stream, As a result, the total amount of $11,500m^3/day$ was set as the target instream flow for the Mugeo Stream. It was chosen as the optimal alternative for securing the total external supply of $10,000m^3/day$ which have to be transfered from the riverbed flow diverted through the Taewha Main river at upstream of Samho bridge. The water duality throughout the Mugeo Stream channels will be improved considerably to 3-4 mg/l of BOD standard if the target instream flow is supplied and sewage is intercepted by the sanitary sewage system.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.409-411
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• 2008

Water conveyance from waste water treatment plant can play a role in securing river water quantitatively in urban watershed, but it can also cause more severe contamination of river water due to lack of water quality management. Soil aquifer treatment(SAT) has been introduced to overcome the worsening water quality in the water conveyance system considering the characteristics of Korean urban watershed. The application of SAT to the water conveyance system not only improve water quality of ordinarily discharged water but also prevent accidential water pollution to the urban watershed. Since most domestic urban watersheds are consist of narrow terrace lands and surrounded by roads, SAT is estimated not to be appropriate to the urban watershed with respect to the quantitative efficiency. However, since the upstream of urban watershed in which discharge ports are located usually consists of agricultural lands, SAT can be applied near discharge ports. Therefore, combination of water conveyance and SAT is expected to supply clean and safe river water in urban watershed.

• 농업과학연구
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• 제37권2호
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• pp.285-293
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• 2010

To secure instream flow at the Yudeung urban stream reach of Daejeon city in South Korea, Yudeung upstream diversion was designed with total water storage of $59{\times}10^4m^3$, and the upstream Seongol reservoir was planned to raise the bank with various sizes. Downstream streamflows were simulated by considering outflows from upstream diversion and reservoir, and after then flow durations were analyzed and compared with flows of no reservoir condition. In case of no diversion or reservoir upstream, flow durations were $1^{st}$ flow of $84.72m^3/s$, $95^{th}$ flow of $2.10m^3/s$, $185^{th}$ flow of $0.92m^3/s$, $275^{th}$ flow of $0.42m^3/s$, and $355^{th}$ flow of $0.31m^3/s$. In case of upstream diversion, flow durations were $1^{st}$ flow of $94.38m^3/s$, $95^{th}$ flow of $2.96m^3/s$, $185^{th}$ flow of $1.22m^3/s$, $275^{th}$ flow of $0.50m^3/s$, and $355^{th}$ flow of $0.35m^3/s$. The increase flow rates were $0.04m^3/s$ in $355^{th}$ flow, $0.08m^3/s$ in $275^{th}$, and $0.30m^3/s$ in 185th. In case of Seongol reservoir with effective storage capacities of $365{\times}10^4m^3$, $544{\times}10^4m^3$, $750{\times}10^4m^3$, and $992{\times}10^4m^3$, flow durations were $85.5{\sim}83.9m^3/s$ on $1^{st}$ flow, $2.85{\sim}2.57m^3/s$ on $95^{th}$ flow, $1.16{\sim}1.27m^3/s$ on $185^{th}$ flow, $0.64{\sim}0.99m^3/s$ on $275^{th}$ flow, and $0.56{\sim}0.94m^3/s$ on $355^{th}$ flow. The increase flow rates were $0.25{\sim}0.63m^3/s$ in $355^{th}$ flow, $0.22{\sim}0.57m^3/s$ in $275^{th}$, and $0.24{\sim}0.35m^3/s$ in $185^{th}$. The more the sizes of upstream reservoirs increased, the $1^{st}$ and $95^{th}$ flows decreased in which coefficients of determination were 0.92, 0.99, respectively and the $185^{th}$, $275^{th}$, and $355^{th}$ flows increased in which coefficients of determination were 0.93 to 0.99.

• 한국수자원학회논문집
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• 제55권8호
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• pp.635-643
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• 2022

우리나라 유역 상류부의 물 공급 소외 지역에서 취수원 용량이 극히 제한적인 계곡부 지역 등을 대상으로 샌드댐을 설치·운영함으로써 대체수자원 확보시설로 활용하고자 하는 시도가 이루어지고 있다. 샌드댐이 가장 활발하게 설치·활용되고 있는 것으로 알려져 있는 아프리카 지역 일부 국가들의 경우 샌드댐에 관한 별도의 법제도를 수립·적용하고 있는 사례를 찾아보기 어렵다. 샌드댐은 지하수댐의 일종으로서, 그 개념, 구조적·기술적 형태와 특성, 목적과 용도, 기능 등에 비추어 현행 「지하수법」 상 명시되어 있는 지하수자원확보시설로서의 법적 성격과 지위를 갖는다고 할 것이다. 지하수자원확보시설에 관한 규정의 해석과 적용 역시 이를 뒷받침한다. 따라서 샌드댐 사업은 「지하수법」을 근거로, 지하수자원확보시설의 설치·관리 사업의 하나로 추진·시행되는 것이 법논리적으로나 현실적으로 타당하고 합리적이다. 다만, 현행 명문 규정상 지하수자원확보시설에 샌드댐이 당연히 포함되는 것으로 볼 수 있는지에 대해서는 다소 명확하지 않은 점이 있어 그에 관한 종합적 고찰과 더불어 관련 법제도의 개선이 요구된다고 할 것이다.

• 한국수자원학회논문집
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• 제44권10호
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• pp.787-795
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• 2011

본 연구는 기후변화에 따른 극한홍수 저감을 위한 하나의 방안으로서 농경지의 저류지화를 통한 홍수저감 방안에 대한 정책 연구이다. 이를 위해 하천의 횡적 공간을 확보하여 저류지로 활용하는 방안을 제안하며 실효성 검증을 위해 낙동강구미 상류지역을 대상지로 선정하여 극한홍수에 대한 홍수저감효과를 분석하였다. 홍수저감효과분석에는 LISFLOOD 모델이 사용되었으며 과거 침수이력이 있는 농경지를 저류지로 활용 하였을 경우 500년 빈도 홍수 발생 시 최대 약 0.53 m의저감효과가있는것으로나타났다. 대상농경지의저류지화를위해해외선진사례분석을통한다각적공간확보방안들이 검토되었으며 그 중 평상시 활용가능성, 비용효과, 토지의 공공성 확보와 계약과 보상에 따른 마찰 등을 고려하여 지역권 설정 및 재해보상제를 활용한 방안들이 대안으로 제시되었다. 또한 낙동강 대상지에서의 토지매수제와 지역권 설정을 통한 공간확보 비용을 비교하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.276-276
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• 2022

Estuarine dams are constructed for securing freshwater resources, flood control, and improving upstream navigability. However, their impact on estuarine currents, stratification, and sediment fluxes is not well understood. To develop a general understanding, an idealized modeling study was carried out. Tide and river forcing were varied to produce strongly stratified, partially mixed, periodically stratified, and well-mixed estuaries. Each model ran for one year. Next, the models were subject to the construction of an estuarine dam and run for another year. Then, the pre- and post-dam conditions were compared. Results showed that estuarine dams can amplify the tidal range and reduce the tidal currents. The post-dam estuaries tended to be a salt wedge during freshwater discharge and a bay during no freshwater discharge. For all estuaries, the estuarine turbidity maximum moved seaward, and the suspended sediment concentrations tended to decrease. In terms of sediment flux mechanisms, the estuarine dam increased the seaward river runoff for cases with strong river, and increased the landward tidal pumping for cases with strong tides.

• 한국물환경학회지
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• 제32권3호
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• pp.243-252
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• 2016

In cases of water pollution accidents, accurate prediction for arrival time and concentration of contaminants in a river is essential to take proper measures and minimize their impact on downstream water intake facilities. It is critical to fully understand the behavior characteristics of contaminants on river surface, especially in case of oil spill accidents. Therefore, in this study, the effects of main parameters of advection and diffusion of contaminants were analyzed and validated by comparing the results of Lagrangian particle tracking (LPT) simulation of Environmental Fluid Dynamic Code (EFDC) model with those of Global Position System (GPS)-equipped drifter experiment. Prevention scenario modeling was accomplished by taking cases of movable weir operation into account. The simulated water level and flow velocity fluctuations agreed well with observations. There was no significant difference in the speed of surface particle movement between 5 and 10 layer modeling. Therefore, 5 layer modeling could be chosen to reduce computational time. It was found that full three dimensional modeling simulated wind effects on surface particle movements more sensitively than depth-averaged two dimensional modeling. The diffusion range of particles was linearly proportional to horizontal diffusivity by sensitivity analysis. Horizontal diffusivity estimated from the results of GPS-equipped drifter experiment was 0.096 m²/sec, which was considered to be valid for applying the LPT module in this area. Finally, the scenario analysis results showed that particle movements could be stagnant when discharge from the upstream weir was reduced, implying the possibility of securing time for mitigation actions such as oil boom installation and wiping oil contaminants. The outcomes of this study can help improve the prediction accuracy of particle tracking simulation to establish the most suitable mitigation plan considering the combination of movable weir operation.

• 한국해양바이오학회지
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• 제16권1호
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• pp.63-86
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• 2024

This study analyzed the distribution, diversity, and density variation of algal clusters in a freshwater reservoir from an oceanic island and a traditional inland water system to gain insights on future marine freshwater resource management. In the Paldang water system (Han River), despite the upstream Paldang Dam and the downstream Jamsil underwater reservoir being in the same meteorological zone, their algae density patterns varied inversely. The distinct algal cluster structure (diversity/dominance) of Paldang was altered in the downstream reservoir, suggesting that physical devices aid algae management in traditional water systems. In contrast, 24 out of 35 genera (63.2%) identified in the Jeolgol Reservoir (Baeknyeong Island) were unique, lacking regulatory mechanisms, and existing in a complex ecotone. The desmid Chlorophyceae Cosmarium, adapted to higher photosynthetic stress and low temperatures, dominated in January (38.04%) and August (86.45%) during the periods of extreme photosynthetic stress. Jeolgol's annual algal cluster structure (H' 2.097; D 0.259; S' 35) demonstrated higher stability than Paldang (H' 1.125; D 0.448; S' 13) and the Jamsil underwater reservoir (H' 1.078; D 0.469; S' 12), maintaining an H' above 1.5 even during midwinters. No evidence of TN/TP inflow from surrounding soils was observed, even during torrential rainfalls, with phosphorus being the limiting factor for algal growth. TOC, BOD, chlorophyll-a, and turbidity peaked during Cosmarium bloom. Future climate change is expected to cause fluctuations in algal clusters and related water quality factors. The complex transitional nature of the Jeolgol Reservoir, its algal diversity, and the interspecies interactions contribute to the high stability of its algal community.