• 한국주거학회논문집
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• 제25권3호
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• pp.53-62
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• 2014

This paper investigates whether the use of Rainwater Harvesting Systems (RWHSs) to provide water for washing machines in Hong Kong residential buildings would be financially attractive. In such systems, rainwater is accumulated and reused for doing laundry, garden irrigation, flushing toilets, and even drinking. Thus, the analysis of RWHSs' financial feasibility is essential for construction projects. RainCycle is used to validate financial feasibility, considering particular circumstances and data relevant to the Hong Kong context. A range of different scenarios by adjusting three factors are evaluated: catchment area, water demand, and discount rate. It is suggested that $2,000m^2$ would be a suitable catchment area in a typical Hong Kong residential building and it is demonstrated how water demand and discount rate influence the financial performance of RWHSs. In particular, the financial performance of RWHSs is sensitive to discount rates. The results suggest that the RWH system would be worthwhile for buildings with a lower number of floors, but would barely achieve financial validation in Hong Kong's super high-rise residential buildings.

• 한국관개배수논문집
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• 제19권1호
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• pp.19-29
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• 2012

The data of the agricultural water quality survey network was analyzed between from 1990 to 2010 in order to propose effective plans for water quality management by analyzing the characteristics of agricultural lakes and the change of water quality. The result of the analysis shows that there is a correlation between water quality and items that can be a function of water depth such as dam height, dam length, dam height/dam length ratio and active storage/surface area of lake ratio. This means that, Korean agricultural lakes, there is a correlation between water quality and water depth. Water quality of the lakes that have lower than 5m of active storage/surface area of lake ratio (effective water depth) especially tends to get worse rapidly. The Chl-a and COD concentration of Korean agricultural lakes have a tendency to increase between June and September. Therefore, we recommend first taking a water quality improvement project for the lakes preformed watershed management project, and taking a preventive short-term water quality improvement project for the unperformed lakes before June among lakes that have lower than 5m of effective water depth.

• 한국농공학회지
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• 제30권1호
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• pp.31-37
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• 1988

This study, based on the monthly rainfall data, was carried out to determine the agricultural drought index which enables to describe the regional and seasonal drought characteristics of rice cropping system in Korea. The results obtained were summarized as follows ; 1.A new agricultural drought index (ADI) was evaluated seasonally according to the product of drought intensity and duration. This ADI is proposed as standard design criterion for irrigation planning. 2.The relationship between agricultural drought index and return periods was figured out. These diagrams could be used to estimate the seasonal drought severity of a certain year and to select design year corresponding to the specific drought frequency. 3.The regional drought characteristics were classified and those are useful to determine proper rice varieties and planting time and make drought counterplans. 4.Spring drought occurred once in 3 or 4 years and in a regional respect, rather frequently occurred in Seoul and Daegu areas than in Busan, Daejeon, Kwangju and Chuncheon areas. Summer drought occurred once in 5 years in Daegu and Busan areas and once in 7 or 8 years in other areas. 5.Sequential drought which gave severe drought damage of rice production occurred once in 20 years in Daegu area and in 10 years in Kwangju area.

• Journal of Chest Surgery
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• 제33권8호
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• pp.688-692
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• 2000

Descending Necrotizing Mediastinitis(DNM) is a complication of oropharyngeal infections that can spread to the mediastinum. It is difficult to diagnose early because clinical and radiologic findings appear in the late stage of the infection. late diagnosis is the principal reason for the high mortality in DNM. An 18-year-old female admitted with Ludwig's angina from dental caries. Despite of combined antibiotics, dental extraction and drainge of submental abscess, infection spread to the cervical area. Chest computed tomogram revealed extension of the abscess to the pretracheal and periaortic space and development of bilateral pleural empyema. We performed bilateral cervical mediastinotomy and thoracotomy for drainage and debridement. Tracheostomy to secure the airway and postoperative pleural irrigation were performed. Postoperative course was uneventful and patient was discharged on the 40th postoperative day. It is important to perform chest CT scanning for early diagnosis of DNM when oropharyngeal infection spreads to the cervical area. Improved survival of patients with DNM implies early and radical surgical drainage and debridement via a cervical mediastinomy and thoracotomy.

• 물과 미래
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• 제27권3호
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• pp.83-83
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• 1994

본 연구의 목적은 수자원 이용이 매우 복잡한 금강유역의 하류부에 위치한 금강하구호에 대하여 물수지를 분석함과 동시에 금강유역 전역의 용수수급 상황을 파악하는 것이다. 본 논문에서는 금강 하구호의 월 유입량을 추정하였으며, 월유출량은 자연유출과 저수유출에 대해 평가하였다. 연구결과, 상류의 대청댐으로 인해 금강 하구호 유입지점의 자연유출에 따른 유입량은 댐 건설전에 비해 홍수기인 7월에는 8.4% 감소하며, 홍수기를 제외한 10월부터 6월까지는 0.4∼17.6%가 증가하는 것으로 나타났다. 또한 저수유출에 따른 유입량의 월별 변동은 농업용수의 수요가 큰 5-6월에 비교적 크게 나타났다.

• 물과 미래
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• 제17권2호
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• pp.107-112
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• 1984

저수지내의 퇴사량을 추정하기 위하여 국내 3개 유역의 66개 관개용 저수지의 퇴사실측자료를 사용하여 저수지 퇴사량과 유역면적, 토사포착효율, 유역의 경사, 유역의 형상계수 및 저수지퇴사기간간의 상관관계를 단순회귀모형과 다도수회귀모형으로 제안하였다. 제안된 모형의 적합성을 실측자료로부터 검정하였으며 그 결과 다도수회귀모형에 의한 것이 단순회귀모형에 의하여 산정된 것보다 훨씬 정확한 것으로 판정되었다. 저수지의 년비유사량과 유역면적 및 토사포착효율과 상관시켰다. 저수지내의 년평균퇴사율과 년평균저수지내용적용적의 변동은 토사포착율에 의해 크게 좌우됨을 알았다.

• International Journal of Fluid Machinery and Systems
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• 제7권2호
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• pp.68-79
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• 2014

The type of turbine developed is based on the very low head of water potential source for the electric power production. The area of research is focused for the axial water turbine that can be applied at the simple site open channel with has a very low cost and environmental impact compared to the conventional hydro installation. High efficiency of axial turbine which applied to the very low potential head will made this type of turbine can be used at wider potential site. Existing irrigation weir and river area will be the perfect site for this turbine. This paper will compare the effects of the variation of swirl velocity criterion during the design of the blade of guide vane and rotor of the turbine. Effects of the swirl velocity criterion is wider known as a vortex conditions (free vortex, force vortex and swirl velocity constant), and the free vortex is the very popular condition that applied by most of turbine designer, therefore will be interesting to do a comparison against other criterion. ANSYS Fluent will be used for simulation and to determine the predictive performance obtained by each of design criteria.

• Journal of Forest and Environmental Science
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• 제27권2호
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• pp.73-79
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• 2011

The Barind tract is threatened by desertification and undergoing rapid change. In view of this fact it is very much essential to manage this barind tract under proper land-use plan. The present study evaluates the effectiveness of high-resolution satellite data and computer aided GIS techniques in assessing land-use change detection for the period 1990 to 2007 within the study area, which is very much essential to manage this barind tract under proper land-use plan, and for proper land-use plan it is necessary to get reliable information. The present study found five major land-use such as current fallow, current agriculture, settlement, irrigation water and water bodies. From the result, it is found that current fallow and water bodies decrease while settlement and current agriculture increase. Study concludes that as Barind tract is threatened by desertification, decrease of water bodies is not a good sign for the study area.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2021년도 학술발표회
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• pp.467-467
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• 2021

기존 저수지 농업용수는 주로 논의 벼재배 용수공급을 목적으로 설계되었지만, 논 지역 타작물 재배 지원 등의 정책으로 논에서 밭으로 전작화가 증가함에 따라 농업용수의 효율적 분배를 위한 논의 전작화 패턴 분석이 필요한 실정이다. 이에 본 연구에서는 공공데이터 포털의 2019년 팜맵을 활용하여 최신 경지 현황을 파악하고, 환경부의 2007년, 2019년 토지피복지도를 이용하여 전작화 패턴을 분석하였다. 구축된 팜맵과 토지피복지도는 환경부 토지피복분류 기준 농업지역 중분류로 일치시켜 분석에 활용되었다. 논, 밭, 시설재배지 등의 농경지 이용 현황 및 전작화 추이는 전국 단위, 권역 단위로 분석되었고, 주요 시도와의 공간적 거리를 전작화 영향인자로 설정하여 DUP(Degree of Urban Proximity) 등의 지표로 그 영향을 확인하였다. 또한, 전체 경지 중 논, 밭의 면적과 증감 추이를 ACR(Area Change Rate) 등의 지표로 전작화 규모를 파악하였고, LPI(Largest Patch Index), LSI(Landscape Shape Index) 등의 지표로 개별/집단화 전작의 패턴분석을 수행하였다. 본 연구로 제시된 저수지 수혜 구역별 논의 전작화 패턴은 논 벼재배와 농업용수 수요 특성이 상이한 밭작물에 안정적 용수공급 체계 구축 등의 기초자료로 활용 가능할 것으로 생각된다.

• 한국토양비료학회지
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• 제26권2호
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• pp.132-137
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• 1993

금호강(琴湖江) 하류(下流)의 오염(汚染)된 하천수(河川水)를 관개수원(灌漑水源)으로하는 농가답(農家畓) 두곳(경산통(慶山統):Gk, 규암통(窺岩統):Gy)에서 관개(灌漑)수의 오염도를 조사하고, 합리적(合理的)인 시비법(施肥法) 개선(改善)의 기초자료(基礎資料)를 얻고자 시험(試驗)을 실시(實施)하였다. 관개수질(灌漑水質)은 pH는 6.7~7.4, COD:21.3~52.8, $NH_4-N$:3.2~5.3ppm, $PO_4$:1.6~6.0ppm으로서 오염도(汚染度)는 6월(月)이 가장 심(甚)하였고 8월(月)은 적었다. 공시토양(供試土壤)의 화학적(化學的) 특성(特性)은 pH가 경산통(慶山統)은 5.6~6.0 규암통(窺岩統)은 6.1~6.3이었고, 인산(燐酸) 및 규산함량(珪酸含量)은 규산처리구(珪酸處理區)에서 가장 높았다. 벼 초장(草長), 경수(莖數) 및 수량(收量)은 질소감비구(窒素減肥區) 떨어지지 않았다. 백미중(白米中) $Mg/(K{\times}N)$비(比)와 호응집성(糊凝集性)은 질소감비구(窒素減肥區)에서 가장 높았고, 알카리붕 괴도와 단백질함량(蛋白質含量)은 적었다. 따라서 오염관개수(汚染灌漑水)가 유입(流入)되는 논에서는 식미(食味)를 감안할때 질소감비(窒素減肥)가 바람직하였다.