• 한국농공학회논문집
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• 제61권5호
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• pp.1-10
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• 2019

Due to the climate change the drought had been occurring more frequently in recent two decades as compared to the previous years. The change in the pattern and frequency of the rainfall have a direct effect on the farming sector; therefore, the quantitative estimation of water supply is necessary for efficient agricultural water reservoir management. In past researches, there had been several studies conducted in estimation and evaluation of water supply based on the irrigational water requirement. However, some researches had shown significant differences between the theoretical and observed data based on this requirement. Thus, this study aims to propose an approach in estimating reservoir rate based on empirical method that utilized observed reservoir rate data. The result of these two methods in comparison with the previous one is seen to be more fitted for both R2 and RMSE with the observed reservoir rate. Among these procedures, the method that considers the drought year data shows more fitted outcomes. In addition, this new method was verified using 15-year (2002 to 2006) linear regression equation and then compare the preceeding 3-year (1999 to 2001) data to the theoretical method. The result using linear regression equation is also perceived to be more closely fitted to the observed reservoir rate data than the one based on theoretical irrigation water requirement. The new method developed in this research can therefore be used to provide more suitable supply data, and can contribute to effectively managing the reservoir operation in the country.

• 한국농공학회지
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• 제27권1호
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• pp.71-76
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• 1985

The objectives of this field experiment was to determine and recommend the water requirement for harrow considering the factors of soil class and soil moisture status. Experiment was conducted at the -paddy field of the Office of Rural Development in Chungnam Province. The results of experiment were summarized as follows: 1. Continuous drought day of 10-yr return period in transplanting season was about 25 days and the water content ratios at that point were approximately 20% in clayey-loam soil and 12% in sandy-loam soil irrelevantly to the soil-depth. 2. It was recommended that harrow-water requirement for standard design were approximately 9Omm in clayey-loam soil, 110mm in loamy soil and l3Omm in sandy-loam soil.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.629-636
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• 2000

In this study, we investigated the characteristics of labor of water management and maintenance, water requirement, water quality(T-N, T-P, COD) in the paddy plot irrigated by pipeline with two types of hydrants: automatic and manual. The automatic hydrant have been introduced to the paddy field to save water and reduce the labor for water management. The automatic hydrant is automatically opened and closed according to the water depth of a paddy plot. The automatic hydrant generally developed more troubles than the manual hydrant. The water requirements are 2.7mm/d for the automatic hydrant plot and 17.6mm/d for the manual hydrant plot. The concentrations of pollutants in the two plots are higher in the ponded water than in the irrigation water and are highest after fertilizer application.

• 한국농공학회논문집
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• 제54권3호
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• pp.149-157
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• 2012

For the systemic management and planning of future agricultural water resources, deriving and analyzing the various results of climate change are necessary to respond the uncertainties of climate change. This study assessed the impact of climate change on the rainfall, temperature, and agricultural water requirement targeting in the Nakdong-river's basin periodically according to socioeconomic driving factors under the scenarios A1B, A2 and B1 of the Special Report on Emission Scenarios (SRES) through the various IPCC GCMs. As a result of future rainfall change (2011~2100), increasing or decreasing tendency of rainfall change for future periods did not show a clear trend for three rainfall observatories, Daegu, Busan and Gumi. The characteristics of the temperature change consistently show a tendency to increase, and in the case of Daegu observatory, high temperature growth was shown. Especially, it was increased by 93.3 % in the period of future3 (2071~2100) for A2 scenario. According to the scenario and periodic analyses on the agricultural water demand, which was thought to be dependent on rainfall and temperature, the agricultural water demand increased at almost every period except during the Period Future1 (2011~2040) with different increase sizes, and the scenario-specific results were shown to be similar. As for areas, the agricultural water demand showed more changes in the sub-basin located by the branch of Nakdong-river than at the mainstream of the River.

• 한국수자원학회논문집
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• 제33권6호
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• pp.765-774
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• 2000

본 연구는 수계규모에서 과거의 수원공 운영자료를 이용하여 농업용 저수지, 취입보 및 관정 등으로부터 논 관개지구에 공급된 농업용수 공급량의 조사방법을 개발하는 데 그 목적이 있다. 농업용 저수지에 의해 공급된 관개량은 일별 혹은 순별 저수율 자료와 DIROM 모형을 이용하여 추정하였으며, 일별 양수량은 연간 총양수량으로부터 일별 양수패턴을 적용하여 산정하였다. 관정에 의해 취수된 일별 공급량은 논벼의 조용수량과 관정의 설계유량을 고려하여 계산하였으며, 취입보의 일별 공급량은 관개지구의 조용수량, 하천 유량 및 설계취수량 중에서 최소 유량으로부터 구하였다. 1993~1997년의 조사 기간동안에 한강수계에서 공급된 농업용수는 $569백만\;\textrm{m}^3/년부터\;709백만\;\textrm{m}^3/년$의 범위를 보였으며, 5개년 평균 공급량은 $640백만\;\textrm{m}^3/년$이었다.

• 한국농공학회논문집
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• 제61권2호
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• pp.97-104
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• 2019

The purpose of this study was to establish the estimation method of irrigation water amount for sewage treated water reuse for agricultural purpose. To calculate the irrigation water amount, we adopted Penman-Monteith for potential evapotranspiration estimation and applied crop coefficient and irrigation efficiency factor. We developed the irrigation water amount calculation program using C language in Xcode environment. The target district for calculation is having 259 ha of agricultural land located near the Jinyeong Clear Water Circulation Center in Hanrim-myeon, Gimhae city. The meteorological data of the study area were obtained from Changwon weather station from 1986 to 2017. Calculated average and maximum of annual mean potential evapotranspiration were 2.72 mm/day and 6.22 mm/day, respectively. We used K-S (Kolmogorov-Smirnov) for goodness-of-fit test to find optimal probability distribution of annual mean and maximum evapotranspiration. As a result, the normal distribution was selected for the appropriate distribution. The annual mean and maximum potential evapotranspiration for 10-year return period by applying normal distribution were 2.88 mm/day and 6.76 mm/day, respectively. Assuming that the irrigation efficiency is 80%, the irrigation water requirement was calculated as $36.05m^3/day/ha$ and $84.45m^3/day/ha$, respectively, when annual mean and maximum potential evapotranspiration were applied. The actual irrigation water amount can be calculated by applying the crop coefficient and cropping days for the study area based on the developed irrigation water amount estimation program in this study.

• 한국농림기상학회지
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• 제22권3호
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• pp.205-214
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• 2020

본 연구에서는 중량식 라이시미터를 이용하여 토양 및 물관리 방법에 따라 배추와 옥수수 재배기간 동안 물수지를 평가하였으며, 작물 생산성과 물 부족 상황을 고려하여 작물 수분스트레스 계수와 최소 물 필요량을 산정하였다. 2018 년 배추 재배는 정식 2 주 후 빈번한 강우로 인해 관개가 실시되지 않아 무관개구와 적습관개구의 관개량 차이가 없었으며, 생산량 차이 또한 나타나지 않았다. 2018 년 배추 재배를 제외하고 배추와 옥수수 재배에서 적습관개구가 무관개구보다 생산량이 높게 나타났으며 대체적으로 증발산량 또한 높게 나타났다. 생산량과 증발산량은 밀접한 관련이 있으며 바이오매스 증가에 따라 증산작용이 활발해짐을 알 수 있었다. 작물 수분스트레스 계수는 배추 중기 0.8, 후기 0.8, 옥수수 중기 0.8, 후기 0.5 로 산정되었다. 배추와 옥수수의 최소 물 필요량(2017 년 배추 196.2 mm, 2018 년 옥수수 321.0 mm)은 적정 물 필요량(배추 239.4 mm, 2018 년 옥수수 466.9 mm) 대비 각각 82.0%, 68.8% 수준으로 나타났다. 이러한 산정 결과는 물부족 시기에 최소 관수량을 확보하여 작물 재배를 위한 물관리의 기초자료로 활용할 수 있을 것으로 생각된다.

• 한국농공학회논문집
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• 제63권3호
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• pp.59-73
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• 2021

The purpose of this study is to investigate transition of pumping technology, irrigation water requirement, and unit area drainage discharge at the Pumping station-based Irrigation Associations (PIAs) in South Korea during Japanese colonial period (1910-1945). The PIAs established pumping stations and embankments along rivers for the purpose of irrigation, drainage and flood prevention until the mid-1920s. From the late 1920s after major river improvement projects, newly established PIAs did not include the flood prevention in their purpose of establishment. The design criteria of the irrigation and drainage projects, such as irrigation water requirements, design rainfall, and allowable ponding duration were decided according to the circumstances of PIAs. The gross irrigation water requirement of paddy fields increased from the 1920s to the 1940s, and reached the level of 0.0020 m³/s/ha (19 mm/d) in the 1940s for the fairly good irrigation status in the drought. The great floods of 1930, 1933, and 1934 triggered the increase in drainage discharge in the late 1930s, leading to the unit area drainage discharge of 0.9-2.6 m³/s/km² for natural drainage and 0.3-1.1 m³/s/km² for pump drainage. Therefore, several PIAs near the major rivers could avoid repetitive floods damage.

• 한국지리정보학회지
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• 제23권4호
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• pp.120-139
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• 2020

본 연구에서는 CLUE-s(Conversion of Land Use and its Effects at Small regional extent)와 RCP(Representative Concentration Pathway) 4.5 및 8.5 HadGEM3-RA(Hadley Centre Global Environmental Model version 3 Regional Atmosphere)시나리오를 사용하여 미래 농지이용 변화와 기후변화가 관개 필요수량에 미치는 영향을 평가하였다. 논산시(55,517.9ha)의 농지이용 항목으로 논, 밭, 시설재배지를 고려하고 DIROM (Daily Irrigation Reservoir Operation Model)을 이용해 탑정저수지 수혜구역(5,713.3ha)에 대한 관개 필요수량(Irrigation Water Requirement, IWR)을 추정하였다. CLUE-s를 이용한 미래 농지이용 변화를 모의하기 위해 환경부의 2007년, 2013년, 2019년의 토지피복도 6개 항목(수역, 시가지, 논, 밭, 산림, 시설재배지)을 적용하였다. 그 결과, 2100년은 2013년에 비해 논과 밭이 5.0%, 7.6% 감소했으며, 시설재배지는 24.7% 증가하는 것으로 전망되었다. 미래의 농지이용과 기후변화를 모두 고려한 경우의 RCP 4.5 및 RCP 8.5 모두 2090s(2090~2099) IWR은 미래 기후변화만 고려한 경우에 비해 논과 밭에서는 각각 2.1%, 1.0% 감소하고 시설재배지에서는 11.4% 증가하는 것으로 전망되었다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2004년도 학술발표논문집
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• pp.13-13
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• 2004