• 제목/요약/키워드: Water types

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유역 토지이용과 저수지 수질의 상관관계 분석 (Correlation Analysis of Water Quality According to Land Use Types of Reservoir Watershed)

  • 윤동균;정상옥
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2005년도 학술발표논문집
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    • pp.614-619
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    • 2005
  • The object of this study was to presented regression equations for obtaining simply and quickly values of water quality items, BOD, COD, T-N, and T-P. Regression equations obtained to analyze relationships for water quality items to land use types in agricultural reservoir watersheds. In order to derive regression equations, a multiple linear regression analysis was used in this studying reservoirs. In this regression analysis, a independent values used land used types and dependent values used BOD, COD, T-N, T-P values in water quality items. The results showed that numbers of regression equation ranging above 0.90 in a multiple correlation coefficient (MCC) was not found, ranging from 0.70 to 0.90 in the MCC was 6, ranging from 0.40 to 0.70 in the MCC was 20, and ranging from 0.20 to 0.40 in the MCC was 4. The results of this study can be used as a basic information for evaluating simply and quickly water quality for proposing and designing steps in water quality policy.

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도서지역 양수저류 관개지구의 모니터링 및 수문모델 적용 (Application of hydrology model and Monitoring on pumped-storage section in islands district)

  • 김영화;박지성;이영일;한국헌;김채수
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2004년도 학술발표회
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    • pp.215-219
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    • 2004
  • In this study, Types of irrigation water development in islands district were classified. The types were reservior, fleshwater lake, pumped storage, etc. Most of islands district has delveloped reuse irrigation system as a pumped storage system. But. Irrigation water-reuse ratio doesn't define a basis clearly and the value of measurement for water-reuse ratio doesn't exist so far. so, we measured Irrigation water-reuse to clarify for water-reuse ratio in a pumped storage system. Also, we need to develop hydrologic analysis and water balance method with characteristic factor of islands district. that make use of plan about security of agriculture water efficiently in islands district.

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표면코팅 구조재의 달열효과 분석 (An Analysis on Thermal Insulation Effect of Farm Structures Coated with Surface Treatment)

  • 서원명;윤용철
    • 한국농공학회논문집
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    • 제46권4호
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    • pp.39-46
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    • 2004
  • This experiment was carried out to study on the effect of surface coating on thermal insulation of farm structures to improve thermal resistance and reflective effect of solar radiation. Nine different types of experimental specimen were compared in the temperature variations of inside and outside; A, B, C, D. E and F types are box container and G, H and I types are drum container. The size of these containers is $1,500{\times}2,000{\times}2,500$ mm and ${\varphi}$ $280{\times}330$ mm, respectively. Specimen of 3-type box(A, B, C) is galvanized steel sheet of thickness 0.45 mm. D, E and F types are sandwich panel of the thickness 50 mm inserted with urethane, glass wool and polystyrene form, respectively. G, H and I types are paint pot using in general. The surface of A. D, E, F and I types didn't any treatment, B, C and G types were treated with thermal insulation coating on the outside surface(B, G) or the inside and outside surface(C). And H type was treated with water paint coating on the only outside surface. In general, the experimental results showed the following tendencies; In case of A, B and C types. it was found that the thermal insulation effect of types coated with thermal insulation coating was improved remarkably than that of no treatment. And the thermal insulation effect between steel sheet and sandwich panel type was nearly similar There was not a significant difference of thermal insulation effect between thermal insulation coating and water paint coating. In time of drum container filled with rough rice, The difference of heat transfer tendency and temperature variation among surface treatments was nearly similar that of box types of galvanized steel sheet. And there was time lag about 6 hours between the temperature of middle part of rice and that of inside or outside surface.

Growth and yield responses of rice varieties to various soil water deficit conditions under different soil types

  • Kikuta, Mayumi;Samejima, Hiroaki;Magoti, Rahab;Kimani, John M.;Yamauchi, Akira;Makihara, Daigo
    • 한국작물학회:학술대회논문집
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    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
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    • pp.322-322
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    • 2017
  • To avoid drought stress under rainfed upland conditions, it is important for rice to efficiently utilize water at shallow soil layers supplied by rainfall, and access to water retained in deer soil layers. The root developmental characteristics of rice, which play important role in the adaptability to drought conditions, vary depending on the variety. Moreover, water availability for plant differs depending on the soil types that have different physical properties such as water holding capacity, permeability, capillary force, penetration resistance, etc. In this study, we evaluated growth and yield responses of rice varieties to various soil water deficit conditions under three different soil types. The experiment was conducted in a plastic greenhouse at the Kenya Agricultural and Livestock Research Organization-Mwea from October 2016 to January 2017. Two upland varieties (NERICA 1 and 4) and one lowland variety (Komboka) were grown in handmade PVC pots (15.2 cm diameter and 85.0 cm height) filled with three different types of soil collected from major rice-growing areas of the country, namely black cotton (BC), red clay (RC), and sandy clay (SC). Three watering methods, 1) supplying water only from the soil surface (W1), 2) supplying water only from the bottom of the pots (W2), and 3) supplying water both from the soil surface and the bottom of pots (W3), were imposed from 40 days after sowing to maturity. Soil water content (SWC) at 20, 40, and 60 cm depths was measured regularly. At the harvesting stage, aboveground and root samples were collected to determine total dry weight (TDW), grain yield, and root length at 0-20, 20-40, 40-60, and 60-80 cm soil layers. Irrespective of the watering methods, the greatest root development was obtained in RC, while that in BC was less than other two soils. In BC, the degree of yield reduction under W1 was less than that in RC and SC, which could be attributed to the higher water holding capacity of BC. In RC, the growth and yield reduction observed in all varieties under W1 was attributed to the severe drought stress. On the other hand, under W2, SWC at the shallow soil depth in RC was maintained because of its higher capillary force compared with BC and SC. As the result, growths and yields in RC were not suppressed under W2. In SC, deep root development was not promoted by W2 irrespective of the varieties, which resulted in significant yield losses. Under W1, the rice growth and yield in SC was decreased although shallow root development was enhanced, and the stomatal conductance was maintained higher than RC. It was suspected that W1 caused nutrients leaching in SC because of its higher permeability. Under rainfed conditions, growth and yield of rice can be strongly affected by soil types because dynamics of soil water conditions change according to soil physical properties.

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강우분포유형이 저수지의 홍수위에 미치는 영향 (시화호를 중심으로) (Effect of Temporal Distribution of Rainfall on Water-Surface Level of Sihwa Lake)

  • 이정규;이재홍
    • 한국수자원학회논문집
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    • 제36권2호
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    • pp.325-343
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    • 2003
  • 본 연구는 설계확률강우량에 대한 다양한 강우의 시간적 분포유형을 시화호 유역에 적용하여 강우분포유형에 따른 유출특성을 비교 분석하였으며 시화호의 저수지 추적을 통하여 저수위에 미치는 강우분포유형의 특성을 분석하였다. 저수지추적시 외조위 조건을 고려하였으며, 저수위를 산정할 수 있는 프로그램(IWSEA)을 개발하였다. 연구결과를 요약하면 저수지 유입 홍수유량은 Mononobe분포식을 적용할 때 제일 크게 나타났고, 최고저수위는 외조위 조건이 소조일 때, 강우분포유형을 Pilgrim-Cordery방법을 적용하였을 때 가장 높게 나타났다.

천문 점성학과 융의 심리학적 유형과의 연관성 -지수화풍(地水火風) 4대(四大)와의 관계를 중심으로- (Study on Correspondent of Astrology and Jung's Psychological Types -Focused on earth, water, fire and wind(Four major factors)-)

  • 이용철;김병수;강정수
    • 혜화의학회지
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    • 제18권1호
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    • pp.117-127
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    • 2009
  • Study on correspondent of eastern and western astrology and Jung's psychological types, we obtain as follow as results. Western astrology is transmitted from China and developed, it influenced on the study of the Four Pillars(四柱學). Comparing assemble, gathering, punishment, destruction, collision, impair of Di-zhi(地支) in the study of Four Pillars with Xing-gong theory(星宮論) in the western astrology, can get the result that the Pillars study has close connection with astronomy and astrology. When we compared Jung's psychological types with astrology, the five elements(五行) and the four major factors, can be summarized like this. (1) intuition-fire sign-wood and fire-fire in the four major factors(四大), (2) sensation-earth sign-earth and metal-earth in the four major factors, (3) thinking-air sign-metal and water-wind in the four major factors, (4) feeling-water sign-water and wood-water in the four major factors. The four major factors of Buddhism is now understood as, earth, water and fire represent the state of solid(earth), liquid(water), gas(fire) and wind can be recognized as energy source help the changes. This is mentioned throughout the books, but only arranging the theory of four major factors.

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국가 지하수 관측망 자료를 이용한 충적층 지하수 함양률의 공간적 변동성 연구

  • 문상기;우남칠;한원식
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 2002년도 총회 및 춘계학술발표회
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    • pp.237-242
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    • 2002
  • This study is objected to assess the recharges of phreatic aquifers in the south Korea. The water level data of the national ground-water monitoring network were analysed by PCA(Principal Component Analysis), and classified to 8 types. The recharge were estimated by ‘water-level change method’ on basis of the classified types and compared with the previous methods(hydrograph separation methods) on basis of 4 river basins. The recharge were various type by type and site by site. But the recharge estimated by this study were consistent with that of the other studies.

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SWMM 모형을 이용한 서암동지구에서의 유출수 저감을 위한 저영향개발기법 적용 (Apply Low Impact Development for the reduction of runoff using SWMM model)

  • 우원희;이태우;박윤식
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2017년도 학술발표회
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    • pp.218-218
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    • 2017
  • Urbanization increases impervious area and decreases the water quantity infiltrating into soil layers. This leads to lack of ground water, it could be possibly problematic for agricultural water for crop growth in lower basins, reducing not only ground water but also streamflow quantities. One such approach to minimize the impact of urbanization is to apply low impact developments (LIDs). LIDs are to decrease the percentage of impervious area so that infiltration rate is increased, there is a need to simulate the LIDs prior to the construction. LIDs in Storm Water Management Model (SWMM) are limited to be seven types, however it is often required to simulate LIDs more than seven types. Therefore an approach to apply eleven LIDs is provided in the study, updating the model parameters. A scenario containing eleven LIDs was given by the environmental decision makers, the effect of LIDs were simulated with the expected annual costs considering establishment and maintenance costs.

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서부민간인 통제구역에서 4가지 둠벙 유형에 따른 수환경 특성과 습생식물 군집의 유사성 분석 (Water characteristics and similarity analysis of wetland plant communities in 4 types of small irrigation ponds in western Civilian Control Zone in Korea)

  • 김승호;김재현;김재근
    • 한국습지학회지
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    • 제13권3호
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    • pp.581-591
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    • 2011
  • 김승호 등(2011)에 의해 제안된 둠벙의 유형이 화학적 수환경 특성과 습지식물의 서식 유무를 반영하는지 확인하기 위하여 4가지 유형을 대표하는 CCZ 내 8개의 둠벙에서 습지식물상과 물의 화학적 특성을 조사하였다. 연구결과 샘통형 둠벙에서는 양이온과 음이온의 농도가 모두 낮았으며, 다른 유형의 둠벙에서는 양이온 또는 음이온의 농도가 높았다. 특히 물흐름형 둠벙인 경의선 둠벙에서는 양이온과 음이온이 모두 높게 나타나 지표수가 주로 유입됨을 보여주었다. 대체적으로 물의 화학적 특성과 습지식물상은 둠벙의 유형 분류에 따라 나누어짐을 보였다. 그러나 CCA와 cluster analysis 모두에서 물흐름형 둠벙은 서로 연관성이 없게 나타났다. 이는 둠벙의 분류 시 논과의 물교환보다 급수원이 더 중요함을 의미한다. 그러므로 이를 반영하는 새로운 둠벙 분류체계가 고려되어야 함을 제안한다.

A Study on Grain Yield Response and Limitations of CERES-Barley Model According to Soil Types

  • Sang, Wan-Gyu;Kim, Jun-Hwan;Shin, Pyeong;Cho, Hyeoun-Suk;Seo, Myung-Chul;Lee, Geon-Hwi
    • 한국토양비료학회지
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    • 제50권6호
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    • pp.509-519
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    • 2017
  • Crop simulation models are valuable tools for estimating crop yield, environmental factors and management practices. The objective of this study was to evaluate the effect of soil types on barley productivity using CERES (Crop Environment REsource Synthesis)-barley, cropping system model. So the behavior of the model under various soil types and climatic conditions was evaluated. The results of the sensitivity analysis in temperature, $CO_2$, and precipitation showed that soil types had a direct impact on the simulated yield of CERES-barley model. We found that barley yield in clay soils would be more sensitive to precipitation and $CO_2$ in comparison with temperature. And the model showed limited accuracy in simulating water and nitrogen stress index for soil types. In general, the barley grown on clay soils were less sensitive to water stress than those grown on sandy soils. Especially it was found that the CERES model underestimated the effect of water stress in high precipitation which led to overprediction of crop yield in clay soils. In order to solve these problems and successfully forecast grain yield, further studies on the modification of the water stress response of crops should be considered prior to use of the CERES-barley model for yield forecasting.