• 한국농공학회:학술대회논문집
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• 한국농공학회 2001년도 학술발표회 발표논문집
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• pp.492-496
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• 2001

The purpose of this study is to estimation of pollutants loads using unit load method in Hong-bo watershed. In general, because river water quality management have been conducted with point source pollutant in our country, pollutants caused by precipitation have not been managed well so far. Especially the pollutants tends to concentrate in the reservoir of reclaimed land. Therefore, the reservoir of reclaimed land is need to continuous monitoring and update of an accurate data. also, It is need to improvement of environmental pollution. There are divide into nine sub-catchments and made an estimate of pollutants loads using unit load method in Hong-bo basin. The sample of data was during the 10 years.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.597-600
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• 2006

In Marine Land underground reinforced concrete structures, such as electric box power structure, water and chloride ion penetrated into concrete through the cracks of concrete and its permeable property, cause the corrosion of reinforcing steel bar, which accelerates the expansive cracks and deterioration of concrete. The purpose of this paper is to evaluate on deterioration of durability concrete through instrumental analysis such as schmidt hammer and carbonation, chloride content. Under the reclaimed marine land, the main cause of deterioration of concrete structures is the steel corrosion due to the penetration of chlorides and the deterioration of outer concrete itself by chemical attack.

• 한국유기농업학회지
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• 제24권2호
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• pp.273-287
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• 2016

Accumulation of excessive salt in Reclaimed coastal tidelands can reduce crop yields, reduce the effectiveness of irrigation, degradation of soil structure, and affect other soil properties. These salts has shown to cause specific ions in the plant over a period of time leads to ion toxicity or ion imbalance and a continuous osmotic phase that prevents water uptake by plants due to osmotic pressure of saline soil solution. This review focuses on the characteristics of salt-affected soils, mechanisms of salt-tolerance plants, desalinization technology, and soil management to maintain sustainable agro-ecosystem in salt-affected soils.

• 한국환경과학회지
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• 제13권1호
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• pp.11-17
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• 2004

The purpose of this study is to present the model of ecological restoration through analysis on the condition of hydrach succession process in brackish water lake. To this study, we investigate and research the present condition of brackish water lake in South Korea. Most brackish water lake in South Korea have characteristics that is come into being malignant hydrach succession. Many lakes were reclaimed to increase foodstuff production. And river conservation work seperate lakes from the ocean. In a embryological view, most lakes based on the brackish water lakes, But present lakes show many different types such as a fresh water lake, a salt lake, a brackish water lake, a swamp, and a marshland. As a result, brackish water lakes have greatly damaged by diverse artificial interventions to promote people's activities. Therefore, in order to manage brackish water lakes systematically, criteria of lake preservation must be coincide with the present conditions of hydrach succession in each lake.

• 한국농공학회지
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• 제45권7호
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• pp.94-106
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• 2003

A pilot study was performed to examine the feasibility of UV disinfection system and the reactivation of indicator microorganisms (TC, FC, E. coli) after UV irradiation for agricultural reuse of reclaimed water. Photoreactivation and dark repair enable UV-inactivated microorganisms to recover and may reduce the efficacy of UV inactivation, which might be drawbacks of the UV disinfection method. The effluent of biofilter for 16-unit apartment house was used as input to the UV disinfection system, and average SS and BOD concentration were 3.8 and 5.7 mg/L, respectively, and the mean level of total coliform was in the range of $1.0\times10^4$ MPN/100mL. UV disinfection was found to be effective and it reduced mean concentration of indicator microorganisms (total coliform, fecal coliform, and E. coli) to less than 100 MPN/100mL within 60s exposure using 17, 25, and 40W lamps. Two UV doses of 6 and 16 mW$\cdot$s/$\textrm{km}^2$ were applied and microorganisms reactivation was monitored under the dark, photoreactivating light, and solar irradiation. Microorganisms reactivation was observed in the UV dose of 6 mW$\cdot$s/$\textrm{km}^2$, and numbers increased up to 5% at the photoreactivating light and 1% at the dark. However, microorganisms were inactivated rather than reactivated at the solar radiation and numbers decreased to non-detectible level about below 2 MPN/100mL in 4 hours. In the case of 16 mW$\cdot$s/$\textrm{km}^2$, microorganism reactivation was not observed indicating that UV dose might affect the reactivation process such as photoreactivation and dark repair. Therefore, concerns associated with microorganism reactivation could be controlled by sufficient UV dose application. Agricultural reuse of reclaimed water might be even less concerned due to exposure to the solar irradiation that could further inactivate microorganisms. The pilot study result is encouraging, however, sanitary concern in water reuse is so critical that more comprehensive investigation is recommended.

• 한국토양비료학회지
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• 제42권Spc호
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• pp.45-46
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• 2009

간척지 토양은 도시화와 산업화로 인해 잠식되는 농경지를 대체하는 식량공급원으로 간척지는 쌀 산업 외에 원예, 축산 등 다양한 생물산업 기반으로 활용되고 있다. 그리고 간척지 논농업(간척지 논 307만 ha)은 온실가스 저감 기능을 가지고 있으며 년간 논 1ha당 이산화탄소 흡수량 21.9t, 산소 공급량 15.9t으로 알려져 있다. 그러나 높은 염농도와 지하수위, 지하수 상승에 의한 재염화 현상, 토양 물리화학성과 배수 불량, 논의 경우 적정 유효토심은 50cm 정도이나 간척지 논 유효토심 20cm 이하로 유효토심이 매우 낮은 편이다. 또한 간척년대 경과할수록 제염은 되나 토양물리성 불량, 시비량 과다와 양분 불균형 발생으로 인하여 수분과 양분보유능 향상 토양관리 기술 개발 필요하다.

• 한국물환경학회지
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• 제39권2호
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• pp.162-174
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• 2023

In order to prevent water pollution caused by organic matter, Total Organic Carbon(TOC) has been adopted indicator and monitored. TOC can be divided into Dissolved Organic Carbon(DOC) and Particulate Organic Carbon(POC). POC is largely precipitated and removed during stream flow, which making DOC environmentally significant. However, there are lack of studies to define spatio-temporal distributions of DOC in stream affected by various land use. Therefore, it is necessary to estimate the past DOC concentration using other water quality indicators to evaluate status of watershed management. In this study, DOC was estimated by correlation and regression analysis using three different organic matter indicators monitored in mixed land-use watersheds. The results of correlation analysis showed that DOC has the highest correlation with TOC. Based on the results of the correlation analysis, the single- and multiple-regression models were developed using Biochemical Oxygen Demand(BOD), Chemical Oxygen Demand(COD), and TOC. The results of the prediction accuracy for three different regression models showed that the single-regression model with TOC was better than those of the other multiple-regression models. The trend analysis using extended average concentration DOC data shows that DOC tends to decrease reflecting watershed management. This study could contribute to assessment and management of organic water pollution in mixed land-use watershed by suggesting methods for assessment of unmeasured DOC concentration.

• 한국작물학회지
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• 제57권3호
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• pp.203-208
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• 2012

서남부간척지에서 벼 재배시 질소시비량 절감을 위한 물관리방법을 구명하기 위하여 세사양토(문포통, 염농도 0.3% 내외)에서 청호벼를 공시하여 시험한 결과를 요약하면 다음과 같다. 토양염농도 변화는 이앙후 3일과 6일 간격 환수에서 활착기에 각각 0.10~0.24%, 0.24~0.32%로 경과되었으나, 9일 간격 환수에서는 0.36~0.52%로 경과되었고 그 이후 영화분화기 까지도 활착기와 같은 염분농도로 경과하였다. 생육 및 수량구성요소는 환수간격 3일과 6일에서는 환수간격과 질소시비량별 차이가 크지 않았으나 환수간격 9일에서는 질소시비량에 관계없이 생육이 저조하였으며 또한 백미품위 및 미질 특성변화는 환수간격보다는 질소시비량간 차이가 컸다. 쌀 수량은 환수간격 3일과 6일에서 각각 평균 497, 492 kg/10a로 질소시비량별 환수간격에 따른 통계적 유의성이 인정되지 않았으나 환수간격 9일에서는 질소시비량에 관계없이 수량이 현저히 감소하였다. 따라서 환수간격과 질소시비량에 따른 쌀 수량, 미질과 염해 등을 고려해 볼때 이앙 후 6일 간격 환수와 질소시비량 17 kg/10a로 시용해도 생육 및 수량에 큰 차이를 보여주지 않아 생산비 절감 및 물 절약 측면에서 적당하다고 생각된다.

• 생태와환경
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• 제37권3호통권108호
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• pp.344-354
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• 2004

본 연구에서는 용수재이용을 위해 생활하수를 지하흐름형 인공습지로 처리한 후 연못시스템에 연결시켜 미생물과 각 수질인자들의 처리효과를 분석하였으며, 그 결과를 요약하면 다음과 같다. SS의 농도는 얼음이 녹은 3월 초순에서 4월 초순까지는 10 mg $L^{-1}$ 이하의 매우 낮은 농도로 우리 나라 방류수 수질기준보다 낮은 농도를 유지할 수 있었으나 겨울이나 여름 특정기간에 농도가 높아서, 용수 재이용시 보건 ${\cdot}$ 위생적인 측면과 더불어 이용자에게 심미적인 불편함이 없어야 하므로 유출부에 여과시설 등 관리대책을 검토할 필요가 있을 것으로 생각된다. $BOD_5$는 식물의 생장과 미생물의 성장이 저조한 동절기의 농도 증가현상과 이들의 활동이 활발한 성장기의 감소현상을 뚜렷히 나타내었으나, 전체적으로는 국제적인 농업용수 재이용 수질기준보다 낮은 수준으로서 우려할 사항이 아닐 것으로 판단된다. 영양물질의 경우 DO가 상승한 호기성상태에서 T-N, T-P 농도가 감소하는 것을 확인할 수 있었다. 수질개선을 목적으로 연못시스템을 이용할 경우 3월중에 상층부를 유출시키고 3월 이후에는 수심을 낮게 유지하여 심수층까지 호기성상태를 유지하는 것이 수질관리에 유리할 것으로 판단된다. 지하흐름형 인공습지에서의 미생물 처리효율은 TC, FC, E. coli 모두 평균 92 ${\sim}$ 96% 이상 높은 처리 효율을 보였으며, 인공습지 유출수가 연못시스템을 거치면서 추가로 평글 83 ${\sim}$ 90% 이상 제거되어 평균 대장균농도가 1,200MPN 100 $mL^{-1}$ 로써 인공습지와 연못시스템을 연계 ${\cdot}$ 적용한 후 농업용수로 재이용하거나 수계로 방류할경우 보건 ${\cdot}$ 위생상의 문제를 크게 줄일 수 있을 것으로 판단된다. 미생물의 소독은 대부분 태양광에 의해서 이루어지기 때문에 본 연구와 같이 연못 상층부에서 유출시킬 경우 높은 처리효율을 기대할 수 있을 것으로 생각하며, 대장균과 연못 내에 존재하는 생물들 사이의 상호작용을 정확히 이해하여 적절한 관리대책을 마련 할 경우 안정적인 방류수 농도를 확보할 수 있을 것으로 판단된다. 자연정화로서 하수처리수를 고도 처리할 수 있는 인공습지와 연못시스템을 연계처리 하면 높은 미생물 소독효율을 나타내어 보건 ${\cdot}$ 위생상의 문제를 크게 줄일 수 있을 것으로 기대된다. 인공습지와 연계한 연못시스템의 하수처리방식은 간단한 구조, 큰 완충능력, 적은 슬러지 발생, 간소한 유지 ${\cdot}$ 관리의 장점을 가지고 있어서, 소규모하수처리와 농업용수 재이용 기술로서 적용가능성이 클것으로 판단된다.

• 한국농공학회지
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• 제44권2호
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• pp.148-160
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• 2002

Lake water quality assessment information is useful to anyone involved in lake management, from lakeshore owners to lake associations. 11 provides lake water quality, which can improve how to manage lake resources and how to measure current conditions. It also provides a knowledge base that can be used to protect and restore lakes. SWMM was applied to simulate the discharge and pollutant loads from Boryeong watershed, and WASP5 was applied to analyze the changes of water quality in Boryeong freshwater lake. In each model, the most suitable parameters were calculated through sensitive analysis and some parameters used default data. Simulated in SWMM and measured discharge showed the accuracy of 88.6%. T-N and T-P exceeds the criteria in the simulation of water quality in Boryeong freshwater lake, and control of pollutant loads in the main stream showed the most effective way. Integrated water quality management system was developed to give convenience in the operation of SWMM and WASP5 and data acquisition.