• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.389-389
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• 2023

우리나라는 농업 산업화의 발달로 인하여 농업용수, 공업용수, 생활용수 사용이 증가하며, 하천에서 직접 물을 취수하여 사용하고 있고 이용 후 생활용수, 농수로 등을 통해 회귀되는 유량이 많아 하천의 유출 특성을 파악하는데 어려움이 있다. 따라서 정확한 하천 유출 체계 특성을 파악하기 위해서는 하천에서 사용되는 물의 이용 특성에 대하여 파악할 필요가 있다. 본 연구에서는 길안천에 운영되고 있는 취수 시설에 대해 문헌조사와 현장조사를 진행하였으며, 조사한 자료를 토대로 하천의 물 사용 체계 모식도를 작성하였다. 길안천 유역의 조사 구간은 대사3교 하류에서 구)묵계교 상류까지 조사를 실시하였다. 문헌조사 대상시설은 취입보, 취수장 등이며, 조사대상은 하천의 유출특성에 영향을 줄 수 있는 시설로 길안천 유역에 영향을 주는 시설에 대해서만 수행을 하였다. 현장조사에서는 현장을 방문하여 취⋅배수시설의 위치 등을 조사하였다. 길안천은 농업용수와 생활용수 사용의 증가에 따라 상하류 측정유량의 반전이 빈번하게 발생하였으나 유출체계 분석을 통해 고려한 결과 안정적인 상하류 관계를 확인하였다. 결과적으로 본 연구를 통해 하천 내 취⋅배수시설 영향에 따른 유출 특성을 고려하여 자료를 검토한 결과 길안천 유역 내의 상하류 유량 반전 시기가 과거에 비해 감소하였으며, 안동시(대사3교)관측소와 안동시(묵계교)관측소 구간의 취⋅배수영향을 고려하여 산정한 유출률을 기존자료와 비교한 결과 일정한 손실고가 유지되는 안정적인 결과를 도출하였다.

• Korean Journal of Ecology and Environment
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• v.37 no.1 s.106
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• pp.112-121
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• 2004

A study was performed to examine the effects of UV-disinfected reclaimed water on microorganism concentration during rice culture. Four treatments were used and each one was triplicated to evaluate the changes of microorganism concentrations: stream water irrigation (STR), biofilter effluent irrigation (BE), UV-disinfected water irrigation with dose of 6 mW ${\cdot}$ s $cm{-2}$ (UV-6), and UV-disinfected water irrigation with dose of 16 mW ${\cdot}$ s $cm{-2}$ (UV-16). The indicator microorganisms of interest were total coliform (TC), fecal coliform (FC), and E. coli. The biofilter effluent from 16-unit apartment sewage treatment plant was used as reclaimed water and flowthrough type UV-disinfection system was used. Concentrations of indicator microorganisms in the treatment plots ranged from $10^2$ to $10^5$ MPN/100 mL during 24 hours after irrigation in May and June, where initial irrigation water for transplanting reparation was biofilter-effluent without UV-disinfection. It implies that initial irrigation using only non-disinfected reclaimed water for puddling in paddy field can be health-concerned because of more chance of farmer's physical contact with elevated concentration of microorganisms. The concentrations of microorganisms varied widely with rainfall, and treatments using UV-disinfected water irrigation showed significantly lower concentrations than others and their levels were within the range of paddy rice field with normal surface water irrigation. The mean concentrations of STR and BE during growing season were in the range of 4 ${\times}\;10^3$ MPN/100 mL for TC, and 2${\times}\;10^3$ MPN/100 mL for FC and E, Coli, While mean concentrations of UV-S and UV-lS were less than 1${\times}\;10^3$ MPN/100 mL for all the indicator microorganisms. Overall, UV-disinfection was thought to be feasible and practical alternative for agricultural reuse of secondary level effluent in Korea.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.377-377
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• 2022

수리권은 물을 소유할 수 있는 권리가 아닌 지속적이고 배타적으로 물을 사용할 수 있는 권리를 의미한다. 국내 수리권은 공유하천용수권, 관행수리권, 허가수리권, 댐사용권 및 농어촌용수 수리권으로 구분되어 있다. 미국의 경우 연안주의 수리권 (Riparian Rights), 유용한 사용의 원칙 (Beneficial Use Doctorin)에 근거한 우선전용 수리권 (Prior Appropriation Rights)으로 구분되어 있으며 물 분쟁이 발생할 경우 동등배분원칙에 따라 해결방안을 제시하고 있다. 일본 수리권의 경우 댐 건설할 경우 건설 주체 및 비용 분담이 명확하게 규정되어 있어 별도의 수리권 규정 절차가 없으며 농업용수에 대한 관행수리권 또는 기득수리권이 존재할뿐 그 외의 생활용수 등에 대한 수리권은 존재하지 않는다. 이렇듯 본 연구에서 검토된 국내외 수리권 법률 및 해결 방안에 대한 비교 및 검토 결과는 향후 국내의 수리권 법률 규정에 기초 자료로 활용 될 수 있을 것이다.

• Journal of Korea Water Resources Association
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• v.36 no.5
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• pp.863-878
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• 2003

In this paper, it was studied on a device for maintaining the instream flow by using treated waste water from sewage treatment plant, and discussed on using the inverse circulation system in stream for directly utilizing treated waste water as instream flow. This system is to secure insufficient discharge at upstream, as treated water is pumped from treatment plant which is located at down stream. Therefore, it will be improved water quality with simple water treatment plant, as it is composed of optimal system by consist various types of scheme for transporting. Also, influx method of transferred treated water to a stream will be improved water quality by aeration and be shown environmental friendly spaces. It was considered water quality and present using condition to use for maintenance water in stream by treated water. The guide line for application of inverse circulation system in domestic streams is suggested.

• Journal of Korea Water Resources Association
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• v.45 no.11
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• pp.1143-1156
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• 2012

One of the important purposes of most water resources systems is to prevent from drought damages. However, there are uncertainties in water supply plans from a reservoir due to factors such as limitation of available data, inaccuracy of surveyed data, unsuitability of analysis method, and climate change. In actual operating process, severe drought exceeding the water supply capability makes the normal water usage difficult. In Korea, however, alternative water source such as a development of new water project is very limited in case of water shortages due to drought. Especially, since there is no standard to evaluate the water supply effect considering severe drought damages, it is difficult to prepare the practical measures. In this study, water shortage events of existing multipurpose reservoirs are analyzed and the method of using low-storage emergency water supply is studied by using Water Shortage Index (WSI). The water shortage events are analyzed and the effect of water shortage decrease is evaluated using the existing inflow data of multi-purpose reservoirs. The results show that Imha, Daechung, Hapchon and Namkang reservoirs are highly vulnerable to the severe drought and required to develop additional emergency water source.

• Korean Journal of Ecology and Environment
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• v.39 no.3 s.117
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• pp.285-295
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• 2006

Korean water quality standards for the protection of agricultural water uses were originally derived based on management of public water resource. They were not prepared to protect crop plants from contaminants, and therefore required water parameters in agricultural uses were excluded in current water quality standards. Korean water standards in river and lake have five levels, and level IV is correspondent to agricultural water uses. Currently, there is no Korean guidelines to protect crop plants from contaminants contained in agricultural water. In Canada, agricultural water guidelines are provided to protect crops from contaminants. In this study, agricultural water quality standards in Korea were compared with them in developed countries to evaluate the adequacy of Korean water quality standards for the protection of agricultural water uses. Additional water quality parameters in agricultural uses were also proposed. Suggested parameters include electric conductivity, sodium, chloride, boron, copper, iron, zinc, and microbiological quality, They are the required parameters to protect crop plants as well as human health. Current water quality standards in agricultural uses was not considered to be appropriate in terms of crop protection. Additional water parameters should be included in agricultural water quality standards.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.5
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• pp.477-484
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• 2020

Reservoir operation affects the sustainability of a water supply. However, the increase in the temporal and spatial variability of rainfall, attributed to climate change, has led to severe droughts and increased difficulty in maintaining a sustainable discharge at certain locations in a reservoir system operation. In this study, water yield was evaluated using reservoir simulation with varied water supply. Three reservoir system models were simulated for nine reservoirs in the Han River basin. The time-based reliability, volumetric reliability, and resiliency were used to evaluate the results. Each case was simulated by applying firm supply, deficit supply, and deficit supply with historical power release of the Hwacheon Reservoir. As a result of the simulation, all indexes were increased when the deficit supply was applied. In particular, the time-based reliability increased by more than 30%, and the supply reliability increased by about 4%. The result showed that the water supply of the entire water system could be increased when all reservoirs in the water system were operated to supply water and maintain sustainable discharge at the same downstream point. The deficit supply was an efficient reservoir operation method for responding to climate change, especially increased rainfall variability.

• Journal of Korea Water Resources Association
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• v.44 no.2
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• pp.125-134
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• 2011

The paper is to estimate willingness-to-pay (WTP) for residential water quality improvement in Busan, using non-parametric approach. There are several significant advantages of non-parametric approach, compared to parametric methods. That is, no probability distribution assumption is necessary so that there are no needs to assume or test goodness of fit, model specification and heteroscedasticity statistically. For the reliability and the validity of contingent valuation method a survey was conducted for 665 respondents, who were sampled by stratified random sampling method, by personal interview method. The result of mean WTP for residential water quality improvement in Busan was estimated to be 3,190 won to 3,331 won per month per household, while median WTP being 1,750 won. Provided that our sample is broadly representative of the Busan's population, an estimate of the annual aggregated benefit of residential water improvement for all Busan households is approximately 50.2 billion won in case of mean WTP or 27.5 billion won in case of median WTP.

• Korean Journal of Food Science and Technology
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• v.43 no.4
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• pp.453-457
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• 2011

The effect of the amount of water added during fermentation on the quality of takju (rice beer) was investigated. Takju was made by adding water 2-fold (A), 4-fold (B), 5-fold (C), and 6-fold (D), respectively, of the rice weight (w/w). Although the amount of takju increased in proportion to the amount of water added before fermentation, the amounts of B, C, and D were 1.17-1.19 times larger than the amount in A, and the total acidities of B, C, and D were 1.34, 1.40 and 1.46 times higher than those in A after adjusting alcohol content to 6%(v/v). Moreover, the sensory preferences for B, C, and D were higher overall than those for A, which was suggested to be due to the amount of sweet, sour, and bitter tastes as well as body in A. Different types of takju could be made by changing the amount of water added before fermentation.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.11a
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• pp.93-98
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• 1998

도시생활용수 및 공업용수의 급격한 수요증가 때문에, 이로 인해서 발생되는 배수와 폐수에 의한 수질오염은 큰 사회문제고 대두되었으며 시급히 해결해야 하는 할 과제이다. 따라서 처리방법은 활성탄 흡착, 오존산화, 약품침전, 이온교환, 전기투석, 역침투 및 포말분리등 여러가지의 방법을 선택할 수 있으나 그 처리방법은 궁극적으로 폐수의 성상과 장치의 효율에 따라 결정될 수밖에 없다. (중략)