• 제목/요약/키워드: rice water demand

검색결과 60건 처리시간 0.034초

수정 Penman 및 Penman-Monteith 논벼 증발산량 방법 적용에 따른 농업용 저수지 용수공급능 분석 (Analysis of Water Supply Reliability of Agricultural Reservoirs Based on Application of Modified Penman and Penman-Monteith Methods)

  • 조건호;한경화;최경숙
    • 한국농공학회논문집
    • /
    • 제61권6호
    • /
    • pp.93-101
    • /
    • 2019
  • This study aims to analyze the influences of applications of two different evapotranspiration (ET) estimation methods on the irrigation water requirements (IWR) for paddy rice and water supply reliability of agricultural reservoirs. The modified Penman (MP), traditional method, and the Penman-Monteith (PM), the new adopted method, were applied on 149 reservoirs located in Honam province for this study. The weather date was used from 1987 to 2016, and analysed the trends of temperature and rainfall during rice growing season between past and current 10 years respectively. The increased average temperature and rainfall were observed from the current 10 years compared to the past years. This phenomena impacts on the results of ET and IWR estimations with decreased IWR obtained from high rainfall regions and increased ET obtained high temperature regions. For the comparisons of application results of two ET approaches, the PM method showed lower ET and IWR, and hence more reliable storage capacity of the reservoirs respect to water supply to paddy fields. The results also showed that the influences of different ET methods applications on the water supply reliability of reservoirs are negligible for the cases of over 3.7 watershed ratio and 670 mm unit reservoir storage, while significant variations of the results obtain from the applications between two ET approaches for the opposite cases. Further studies are necessary to consider various field conditions for practical applications of the PM method estimating ET in the fields of paddy farming.

기후변화가 논 필요수량에 미치는 영향 (Climate Change Impacts on Paddy Water Requirement)

  • 윤동균;정상옥;김성준
    • 한국농공학회논문집
    • /
    • 제53권4호
    • /
    • pp.39-47
    • /
    • 2011
  • The aim of the study is to predict potential evapotranspiration and crop water requirement using meteorological data from MIROC3.2 with A1B scenario. Increase of evapotranspiration due to temperature rise can be observed out of the analysis, while effective rainfall decreased. The evapotranspiration elevation results in large amount of crop water requirement in the paddy farming. It can be seen that rainfall intensification at non-irrigation period brings effective rainfall decrease, while contributes to higher demand of crop water at irrigation period. It is necessary to secure additional water resources to adapt the climate change. It is expected that estimation on potentialevapotranspiration in this study can be used for formulation of master plan of water resources.

관개기 광역논에서의 오염물질의 농도 특성 (Characteristics of Pollutants Concentrations at Paddy Field Areas during Irrigation Periods)

  • 김진수;오승영;김규성;권순국
    • 한국농공학회지
    • /
    • 제43권6호
    • /
    • pp.163-173
    • /
    • 2001
  • This study describes the characteristics of concentrations of pollutants such as total nitrogen(T-N), total phosphorous(T-P), and chemical oxygen demand(COD) at paddy areas during 2-year irrigation periods. The most common order in average concentrations of T-P and COD is podded water > irrigation(or drainage) water > percolated water. Most of pollutants concentrations in drainage water are lower than those in irrigation water after early July due to large uptake of pollutants by rice crop and denitrification. The exponential L (load)-Q(discharge) equations for classified irrigation periods are significant at 0.001 level for irrigation and drainage waters. For drainage water, the concentrations of T-N and COD slightly decrease with discharge, while the T-P concentrations slightly increase with discharge.

  • PDF

빈도 분석법을 이용한 논벼의 한발 기준 10년 빈도 작물 증발산량 산정 (Estimating Paddy Rice Evapotranspiration of 10-Year Return Period Drought Using Frequency Analysis)

  • 유승환;최진용;장민원
    • 한국농공학회논문집
    • /
    • 제49권3호
    • /
    • pp.11-20
    • /
    • 2007
  • Estimation of crop consumptive use is a key term of agricultural water resource systems design and operation. The 10-year return period drought has special aspects as a reference period in design process of irrigation systems in terms of agricultural water demand analysis so that crop evapotranspiration (ETc) about the return period also has to be analyzed to assist understanding of crop water requirement of paddy rice. In this study, The ETc of 10-year return period drought was computed using frequency analysis by 54 meteorological stations. To find an optimal probability distribution, 8 types of probability distribution function were tested by three the goodness of fit tests including ${\chi}^2$(Chi-Square), K-S (Kolmogorov-Smirnov) and PPCC (Probability Plot Correlation Coefficient). Optimal probability distribution function was selected the 2-parameter Log-Normal (LN2) distribution function among 8 distribution functions. Using the two selected distribution functions, the ETc of 10-year return period drought was estimated for 54 meteorological stations and compared with prior study results suggested by other researchers.

농업용수의 기후변화 적응능력 지표 개발 - 가뭄에 대한 적응을 중심으로 - (Development of an Adaptive Capacity Indicator to Climate Change in the Agricultural Water Sector)

  • 유가영;김진택;김정은
    • 환경정책연구
    • /
    • 제7권4호
    • /
    • pp.35-55
    • /
    • 2008
  • 기후변화 적응정책 수립을 위해서는 취약성 평가가 선행되어야 하며 기후변화에 대한 적응능력은 취약성을 구성하는 주요한 요소이다. 본 연구는 농업용수 관리 시스템의 적응능력에 관한 지표를 전라도 지역 벼 생산에 관련된 농업용수 수요량과 공급량 자료를 이용하여 개발하였다. 농업용수 공급량은 한국농촌공사가 관리하는 주요 댐 및 저수지의 저수량 자료를 이용하였고, 벼 생산을 위한 농업용수 수요량은 한국농촌공사의 농업용수 수요량 산정 시스템의 모형 구동결과를 활용하였다. 자료 분석의 공간적 범위는 시 군 구이며, 시간적 범위는 월별 평균량을 1991년-2003년까지 정리한 것이다. 가뭄 스트레스에 대한 농업용수의 적응능력 지표(Adaptive Capacity for Drought Stress index: ACDS index)는 농업용수의 공급량이 수요량보다 큰 시점의 자료가 전체 자료 중에서 차지하는 백분율로 표시하였다. 즉, 농업용수 공급량이 수요량보다 큰 경우가 차지하는 비율이 높을수록 가뭄에 대한 기후변화 적응능력이 높은 것으로 보았다. 개발된 ACDS 지표는 이미 제안된 대형 댐의 물 공급 가능량을 표시하는 지표인 Standard Water Storage Capacity Index(SWSCI)와 비교되었는데, ACDS 지표와 SWSCI는 높은 상관관계($R^2$=0.84)를 보였으며, 이는 개발된 ACDS 지표가 농업용수의 수요와 공급 간의 균형관계를 잘 표현하고 있음을 의미한다. 특히 ACDS 지표는 SWSCI에 비하여 규모가 작은 농업용 저수지의 상태를 보다 잘 표현해 주는 것으로 분석되었다. 본 연구는 농업용수 시스템이 향후 기후변화로 인해 가뭄과 같은 극한상황에 보다 더 자주 노출될 것으로 예측되고 있는 시점에서 기후변화 취약성 지표를 개발하는 데 도움을 주는 방법론적 틀을 제공했다고 할 수 있다. 향후에는 벼 이외의 작물에 대한 농업용수 수요량을 고려한 연구 및 개발된 ACDS 지표의 미래 예측을 통해 기후변화에 농업수자원 분야가 미리 적응할 수 있는 기반을 마련하는 데 도움을 주는 연구로 발전되어야 할 것이다.

  • PDF

평상시 광역논에서의 오염물질의 농도 특성 (Concentrations of Pollutants at Paddy Field Areas during Dry Irrigation Periods)

  • 오승영;김진수;김규성;권순국
    • 한국농공학회:학술대회논문집
    • /
    • 한국농공학회 2001년도 학술발표회 발표논문집
    • /
    • pp.441-444
    • /
    • 2001
  • This study describes the characteristics of concentrations of pollutants such as tolal nitrogen(T-N), total phosphrous(T-P), and chemical oxgen demand(COD) at paddy areas during 2-year dry irrigation periods. Most of pollutants concentrations in drainage water are lower than those in irrigation water after early July due to large uptake of pollutants by rice crop and denitrification. For drainage water, the concentrations of pollutants are constant irrespective of discharges and the average T-N/T-P ratios water range from 14 to 44, suggesting that phosphrous is limiting.

  • PDF

소유역의 토지이용이 유출특성에 미치는 영향 (II) (The Influence on the Runoff Charateristics by the Land Use in Small Watersheds (II))

  • 최예환;최중대
    • 한국수자원학회:학술대회논문집
    • /
    • 한국수자원학회 2005년도 학술발표회 논문집
    • /
    • pp.178-182
    • /
    • 2005
  • In the forthcoming 21C, the development of cultural lives depends on that the water demand will increase or not. On the opposite site of that circumstance, many factors of the small watersheds will influence directly on how to cover the surface of watersheds with land use, no planning developing watersheds, and the rearrangement of small rivers. Especially as the extraordinary climatic Phenomena, exhaust of $CO_2$ and destruction of 03 layer, water resource and water foresting content of the small watersheds will be decreased by confusing on the malting a plan of water resources. For example, those are Typhoon Rusa in 2002, Typhoon Maemi in 2003 and heavy storms in 2004. This study area has three group and one of them having three small watersheds, total five small watersheds. That is, Sabukmyeon small watersheds in Chuncheon, Three small watersheds in Wonju(Jeoncheon, Jupocheon and Hasunamcheon), and Suipcheon in Yanggu-Gun which are located far away each other three group and different precipitation data. According to the land use such as dry field(or farm), rice field, forest land. building site and others in small watersheds, the amount of runoff will be impacted by monthly precipitation. The comparison between the runoff was getting from Kajiyama Formula and calculated runoff from multi-linear regressed equations by land use Percentage was performed with different precipitation data and different small watersheds. Its correlations which are estimated by coefficient of correlation will be accepted or not, as approached 1.0000 values. As the monthly water resources amount is estimated by multi-linear regressed equations with different precipitation data and different small watersheds having no gauging station, we make a plan in order to demand and supply the water quantity from small river watersheds during return periods.

  • PDF

Global Rice Production, Consumption and Trade: Trends and Future Directions

  • Bhandari, Humnath
    • 한국작물학회:학술대회논문집
    • /
    • 한국작물학회 2019년도 추계학술대회
    • /
    • pp.5-5
    • /
    • 2019
  • The objectives of this paper are (i) to analyze past trends and future directions of rice production, consumption and trade across the world and (ii) to discuss emerging challenges and future directions in the global rice industry. Rice is a staple food of over half of the world's 7.7 billion people. It is an important economic, social, political, and cultural commodity in most Asian countries. Rice is the $1^{st}$ most widely consumed, $2^{nd}$ largely produced, and $3^{rd}$ most widely grown food crop in the world. It was cultivated by 144 million farms in over 100 countries with harvested area of over 163 million ha producing about 745 million tons paddy in 2018. About 90% of the total rice is produced in Asia. China and India, the biggest rice producers, account for over half of the world's rice production. Between 1960 and 2018, world rice production increased over threefold from 221 to 745 million tons (2.1% per year) due to area expansion from 120 to 163 million ha (0.5% per year) and paddy yield increase from 1.8 to 4.6 t/ha (1.6% per year). The Green Revolution led massive increase in rice production prevented famines, provided food for millions of people, reduced poverty and hunger, and improved livelihoods of millions of Asians. The future increase in rice production must come from yield increase as the scope for area expansion is limited. Rice is the most widely consumed food crop. The world's average per capita milled rice consumption is 64 kilograms providing 19% of daily calories. Asia accounted for 84% of global consumption followed by Africa (7%), South America (3%), and the Middle East (2%). Asia's per capita rice consumption is 100 kilograms per year providing 28% of daily calories. The global and Asian per capita consumption increased from the 1960s to the 1990s but stable afterward. The per capita rice consumption is expected to decline in Asia but increase outside Asia especially in Africa in the future. The total milled rice consumption was about 490 million tons in 2018 and projected to reach 550 million tons by 2030 and 590 million tons by 2040. Rice is thinly traded in international market because it is a highly protected commodity. Only about 9% of the total production is traded in global rice market. However, the volume of global rice trade has increased over six-fold from 7.5 to 46.5 million tons between the 1960s and 2018. A relatively small number of exporting countries interact with a large number of importing countries. The top five rice exporting countries are India, Thailand, Vietnam, Pakistan, and China accounting for 74% of the global rice export. The top five rice importing countries are China, Philippines, Nigeria, European Union and Saudi Arabia accounting for 26% of the global rice import. Within rice varieties, Japonica rice accounts for the highest share of the global rice trade (about 12%) followed by Basmati rice (about 10%). The high concentration of exports to a few countries makes international rice market vulnerable to supply disruptions in exporting countries, leading to higher world prices of rice. The export price of Thai 5% broken rice increased from 198 US$/ton in 2000 to 421 US$/ton in 2018. The volumes of trade and rice prices in the global market are expected to increase in the future. The major future challenges of the rice industry are increasing demand due to population growth, rising demand in Africa, economic growth and diet diversification, competition for natural resources (land and water), labor scarcity, climate change and natural hazards, poverty and inequality, hunger and malnutrition, urbanization, low income in rice farming, yield saturation, aging of farmers, feminization of agriculture, health and environmental concerns, improving value chains, and shifting donor priorities away from agriculture. At the same time, new opportunities are available due to access to new technologies, increased investment by the private sector, and increased global partnership. More investment in rice research and development is needed to develop and disseminate innovative technologies and practices to overcome problems and ensure food and nutrition security of the future population.

  • PDF

관개 회귀수 추정을 위한 BROOK90-K의 개발과 검증 (Development and validation of BROOK90-K for estimating irrigation return flows)

  • 박종철;김만규
    • 한국지형학회지
    • /
    • 제23권1호
    • /
    • pp.87-101
    • /
    • 2016
  • This study was conducted to develop a hydrological model of catchment water balance which is able to estimate irrigation return flows, so BROOK90-K (Kongju National University) was developed as a result of the study. BROOK90-K consists of three main modules. The first module was designed to simulate water balance for reservoir and its catchment. The second and third module was designed to simulate hydrological processes in rice paddy fields located on lower watershed and lower watershed excluding rice paddy fields. The models consider behavior of floodgate manager for estimating the storage of reservoir, and modules for water balance in lower watershed reflects agricultural factors, such as irrigation period and, complex sources of water supply, as well as irrigation methods. In this study, the models were applied on Guryangcheon stream watershed. R2, Nash-Sutcliffe efficiency (NS), NS-log1p, and root mean square error between simulated and observed discharge were 0.79, 0.79, 0.69, and 4.27 mm/d respectively in the model calibration period (2001~2003). Furthermore, the model efficiencies were 0.91, 0.91, 0.73, and 2.38 mm/d respectively over the model validation period (2004~2006). In the future, the developed BROOK90-K is expected to be utilized for various modeling studies, such as the prediction of water demand, water quality environment analysis, and the development of algorithms for effective management of reservoir.

경지 정리된 광역 논에서 영양물질 수지와 배출 특성 (Nutrient Load Balance in Large-Scale Paddy Fields during Rice Cultivation)

  • 김민경;노기안;이남종;서명철;고문환
    • 한국토양비료학회지
    • /
    • 제38권3호
    • /
    • pp.164-171
    • /
    • 2005
  • 벼농사가 주변 수계의 수질에 미치는 영향을 평가하기 위해 경기도 이천시 부발읍의 광역 논을 대상으로 2002년 5월부터 2003년까지 9월까지 벼 재배기간 동안 논에서 양분물질인 질소와 인의 유입 및 유출부하량을 조사하였다. 재배기간 동안 평균 시비량은 질소가 2002년에 $129.0kg\;ha^{-1}$ 그리고 2003년에 $145.1kg\;ha^{-1}$이었으며, 인은 각각 $56.5kg\;ha^{-1}$$55.1kg\;ha^{-1}$로서, 질소 시비량은 2003년에 약간 많았으나 인 시비량은 비슷하였다. 조사기간 동안 물 수지는 2002년에 강우량 888 mm, 관개수량 1,321 mm, 침투수량 1,028 mm, 지표유출량 677 mm, 증발산량은 342 mm이었고, 2003년에 강우량 1,115 mm, 관개수량 1,493 mm, 침투수량 1,147 mm, 지표유출량 865 mm, 증발산량은 276 mm 이었다. 강우량과 지표배출수량은 2002년과 2003년 모두 결정계수($r^2$)가 각각 0.92와 0.81로 선형적인 양의상관으로 나타나 재배기간 중 논에서의 배출수량은 강우량이 증가할수록 선형적으로 증가하였다. 강우, 관개수, 지표 배출수, 침투수 및 작물흡수량의 질소 부하량은 2002년에 각각 9.9, 41.6, 22.1, 5.5, $123.6kg\;ha^{-1}$이었으며, 2003년에는 각각 15.8, 55.4, 17.3, 7.5, $119.1kg\;ha^{-1}$이었다. 강우, 관개수, 지표 배출수, 침투수 및 작물흡수량의 인 부하량은 2002년에 각각 2.1, 13.0, 3.6, 1.8, $64.0kg\;ha^{-1}$이었으며, 2003년에는 각각 1.6, 15.0, 5.0, 1.2, $61.4kg\;ha^{-1}$이었다. 강우량 및 배출수량과 양분물질 배출 부하량과의 관계는 강우량 및 배출수량이 증가할수록 논에서의 양분물질 배출 부하량은 선형적으로 증가하였다. 또한, 재배시기별 질소와 인의 유입 부하량과 유출 부하량 차이는 전 생육기간동안 유입 부하량이 유출 부하량보다 많아 논은 양분물질을 흡수하는 기능을 가지고 있었다.