• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.2076-2080
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• 2008

최근 국지적인 집중호우 증가로 인하여 침식에 취약한 지역에서 발생하는 탁수는 하천의 심미적인 기능을 크게 저하시키는 요인이다. 하류하천의 효율적인 탁도관리를 위해서는 저수지로부터 직접 방류되는 방류 수 탁도관리와 더불어 본류로 유입되는 각 지류하천의 탁도관리도 함께 이루어져야 한다. 본 논문에서는 낙동강 본류하천을 대상으로 탁수발생에 대한 정량적인 평가를 실시하고자 안동댐부터 구미지점까지 낙동강유역에 대하여 SWAT 모형을 구축하였다. 먼저 본류로 유입되는 지류별 유량을 유역모형을 통하여 산정하고 낙동강 유역에 산재되어 있는 수위표 지점을 기준으로 구축된 유역모형의 검보정을 실시하였다. 본 연구의 주요 목적은 유역모형을 통하여 지류별 유량 및 유사량을 파악함으로써 하류하천의 탁수관리를 보다 효율적으로 수행하고자 함이다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 춘계학술발표논문집
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• pp.888-890
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• 2009

This study presented a lab-scale apparatus for turbidity control in the lakes or reservoirs. Overall, the filamentous mat had a capture efficiency of 70~90% compared with the control group. Generally, the capture efficiency decreased with improved input turbidity flux. However, the attachment and sedimentation were thought to be the main processes for turbidity water retention and removal. Thus, the increase of hydraulic detention time in the mat zone is very important to improve the capture efficiency of the turbidity water.

• 한국지리정보학회지
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• 제13권1호
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• pp.1-15
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• 2010

본 연구는 GIS 기반의 SWAT (Soil and Water Assessment Tools) 모형을 이용하여 탁수발생 잠재가능성 평가지표를 개발하고 수계별 탁수 관리방안 대책을 지원하기 위해 기후변화에 따른 안동호와 임하호 유역의 유출량과 부유사량의 변화특성을 분석하였다. 장래 기후변화자료는 IPCC (Intergovernmental Panel on Climate Change)에서 제공하는 A1B 기후변화시나리오의 MIROC3.2 hires 모델의 결과값을 이용하여 생성하였다. 과거의 기후자료(1977~2006)를 기반으로 20C3M (20th Century Climate Coupled Model) 모의값을 이용하여 강수와 온도를 보정한 뒤 CF (Change Factor) 기법으로 downscaling 하였다. 미래 기후변화 시나리오는 세 기간(2020s, 2050s, 2080s)으로 나누어 분석하였고, SWAT 모형과 연계하여 기후변화에 따른 유출량 및 부유사량의 변화를 산출하였다. 2020s, 2050s, 2080s 기간동안의 안동호와 임하호 유역의 유출량과 부유사량은 기준년도(2006)에 비해 증가하였고, 계절적인 분석에서도 봄, 가을, 겨울철 안동호와 임하호 유역의 유출량과 부유사량이 기준년도에 비해 증가하는 것으로 모의되었다. 단, 여름철 유량과 부유사량은 2020s에만 증가하고 2080s에는 감소하는 것으로 분석되었다.

• 한국물환경학회지
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• 제24권3호
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• pp.365-377
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• 2008

Large artificial dam reservoirs and associated downstream ecosystems are under increased pressure from long-term negative impacts of turbid flood runoff. Despite various emerging issues of reservoir turbidity flow, turbidity modeling studies have been rare due to lack of experimental data that can support scientific interpretation. Modeling suspended sediment (SS) dynamics, and therefore turbidity ($C_T$), requires provision of constitutive relationships ($SS-C_T$) and accounting for deposition of different SS size fractions/types distribution in order to display this complicated dynamic behavior. This study explored the performance of a coupled two-dimensional (2D) hydrodynamic and particle dynamics model that simulates the fate and transport of a turbid density flow in a negatively buoyant density flow regime. Multiple groups of suspended sediment (SS), classified by the particle size and their site-specific $SS-C_T$ relationships, were used for the conversion between field measurements ($C_T$) and model state variables (SS). The 2D model showed, in overall, good performance in reproducing the reservoir thermal structure, flood propagation dynamics and the magnitude and distribution of turbidity in the stratified reservoir. Some significant errors were noticed in the transitional zone due to the inherent lateral averaging assumption of the 2D hydrodynamic model, and in the lacustrine zone possibly due to long-term decay of particulate organic matters induced during flood runoffs.

• 생태와환경
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• 제38권3호통권113호
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• pp.429-434
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• 2005

본 연구는 임하호의 고탁수 발생에 따른 식물플랑크톤 군집의 변화를 조사하기 위하여 2003년 5월부터 2004년7월까지 댐축 지점에서 매월 채집하였다. 2003년 9월과 10월의 가장 높은 탁도(1221 NTU) 형성은 태풍(매미)에 동반된 집중 호우 시기와 일치하였다. 출현한 식물플랑크톤은 모두 102분류군이고, 이 중 규조강이 63증류로 가장 많이 출현하였으며, 녹조강이 23종류. 남조강이 9종류, 시누라조강과 은편모조강이 각각 3종류 그리고 유글레나조강이 1종류가 출현하였다. 총 현존량은 270 ${\sim}$ 4,515 indls. $mL^{-1}$였고, 은편모조강의 Cryptomonas ovata, 규조강의 Cyclotella sp. 그리고 남조강의 Microcystis aeruginosa 등은 고탁수의 감소후 차례로 우점하였다.

• 생태와환경
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• 제38권spc호
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• pp.39-43
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• 2005

The dynamics of water quality with the storm events were analyzed in a small reservoir for irrigation, Lake Wangkung. Water quality of the inflowing stream fluctuated seasonally with the variation of flow rate. Thermal stratification was consistent from April to October below 2 m depths and anoxic layer was developed below 2 m depth in summer. The unique feature of temperature showed that thermal stratification was disrupted by a heavy rain event during monsoon, but hypolimnetic hypoxia were reestablished after a few days. Phosphorus and nitrogen increased immediately following storm events. The marked increase may be due to the input of P-rich storm runoff from the watershed. Internal phosphorus loading can be one of the explanations for TP increases in summer. When there was a storm, total populations of phytoplankton and zooplankton was reduced immediately following the storm, indicating possible flushing of algae and zooplankton. After a lag period of low-density the plankton population bloomed to a peak again within five days after the storm. Turbid water in lake became clear again which coincided with the time of the phytoplankton buildup. The results demonstrate that water quality is regulated greatly by rainfall intensity in Lake Wangkung.

• 한국농공학회논문집
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• 제51권3호
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• pp.37-43
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• 2009

The objective of this study was to investigate the basic relationships between spectral reflectance and varying concentrations of sediment in surface waters. An experimental method for determining suspended sediment concentration (SSC) in the water by use of a spectroradiometer above the water surface, in visible and near-infrared (NIR) wavelengths, is applied. The main advantage of the method is the direct comparison of spectral reflectance and the SSC, but it requires an accurate knowledge of the water body and sediment. Therefore numerous spectroradiometric measurements are carried out in situ measurements, for SSC, ranging from zero to 100 percentage and two types of sediment applied in the water tank. The results indicate that the suspended sediment causes increasing spectral reflectance response in waters. We observed that spectral reflectance increases with SSC, first at the lower wavelengths (430-480 nm), then in the middle wavelengths (570-700 nm), and finally, in the NIR domain (800-820 nm); a characteristic maximum reflectance appears at 400-670 nm. Relationships between the wavelength, integral value, and the SSC were evaluated on the basis of the regression analysis. The regression curve for the relation between the wavelength, integral value, and the SSC were determined ($R^2$>0.98). Finally, the specular wavelength can be estimated to recognize the sediment and to improve SC estimation accuracy in the water.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.131-134
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• 2007

In this paper, we evaluate a red tide detection possibility of GOCI(Geostationary Ocean Color Imager) which will be launched in 2008. To detect red tide, we use a similar wavelength range of MODIS normalized water-leaving radiance data instead of GOCI data. Supposed to GOCI, red tide detection algorithm is based on MRI(MODIS Red tide Index) and use 667nm band to filter turbid water. The algorithm's effectiveness is verified by detecting large Cochlodinium polykrikoides red tide event that was appeared in Korean coastal waters. The evaluation was done by comparing the result with the update data provided by the NFRDI.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.91-96
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• 2005

This study was performed for the research on the method for reducing non-point pollutant with the gabion which was made of gravel-packed plastic frame, and for the characterization of gabion adsorbing pollutant. The result showed that the concentrations of suspended solid in turbid water were reduced to $77.7{\sim}84.7%$ when the water was flowing through the gabion. The uniformity coefficients on the grain size accumulation curves of the adsorbed pollutant were larger on the large grain size gabion than those on the small grain size gabion, and the coefficients of curvature were smaller on the large grain size gabion than those of the small grain size gabion. The adsorption rates were dependent on the grain size of packed gravel. The rates were smaller on inlet and outlet than those on middle place on the series of gabion.

• 방사선산업학회지
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• 제2권3호
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• pp.149-154
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• 2008

The present study described an antimicrobial spray composition comprising nanosized silica-silver particles, in which nano-silver is bound to silica molecules and a water-soluble polymer, the nanosized silica-silver particles prepared by irradiating a solution comprising a silver salt, silicate and the water-soluble polymer with radiation rays. According to a surfactant addition, the compositions were not turbid and were colorless. Also samples (cotton fabrics and wallpaper) were treated with the compositions also did not cause any stains even after drying under sunshine and at $80^{\circ}C$. Our results suggested that the spray formulation product was of practical use to control indoor fungi.