• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.8-12
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• 2022

Water loss is one of the typical but challenging problems in water management. To reduced water loss or increase water efficiency, the pilot projects were implemented in the TTD's irrigation area. Modern soil moisture technology and local level water user training were conducted together as a mean to achieve improved water efficiency. In terms of technology, soil moisture sensors and monitoring system were used to estimate crop water requirement to reduce unnecessary irrigation. This was found to save 16.47% of irrigated water and 25.20% of irrigation supply. Further improvement of water efficiency was gained by means of local level water user training in which stakeholders were engaged in the network of communications and co-planning. The lessons learnt from the TTD pilot project was translated into good water management practices at local level.

• 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.

• 한국농공학회지
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• 제36권2호
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• pp.44-55
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• 1994

This paper describes the development of real-time irrigation reservoir operation models that adequately allocate available water resources for paddy rice irrigation. Water requirement deficiency index(WRDI) was proposed as a guide to evaluate the operational performance of release schemes by comparing accumulated differences between daily release requirements for irrigated areas and actual release amounts. Seven reservoir release rules were developed, which are constant release rate method (CRR), mean storage curve method(MSC), frequency analysis method of reservoir storage rate(FAS), storage requirement curve method(SRC), constant optimal storage rate method (COS), ten-day optimal storage rate method(TOS), and release optimization method(ROM). Long-term forecasting reservoir operation model(LFROM) was formulated to find an optimal release scheme which minimizes WRDIs with long-term weather generation. Rainfall sequences, rainfall amount, and evaporation amount throughout the growing season were to be forecasted and the results used as an input for the model. And short-term forecasting reservoir operation model(SFROM) was developed to find an optimal release scheme which minimizes WRDIs with short-term weather forecasts. The model uses rainfall sequences forecasted by the weather service, and uses rainfall and evaporation amounts generated according to rainfall sequences.

• 한국농공학회지
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• 제26권4호
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• pp.37-51
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• 1984

The purpose of this study is to find out the determination method of designed duty of water in the rice fields through the comparison of the net unit duty of water at the late reduction division to heading stage with that at the planting stage. The data used for analysing this problem are the data of precipitation and gauge evaporation observed by Cheong-ju Meterological Center, the coefficient of evapotranspiration by College of Agriculture, Chung Buk University and the data of transplanting progressing in Boun area. The results obtained from this analysis are summarized as follows. 1.The occurring year of 1/10 probability value for available precipitation, gauge evaporation and mean maximum daily evapotranspiration during growing season is the year of 1977. 2.The 1/10 probability values of mean maximum evapotranspiration per day under the production rate of 1, 400kg/l0a and 1, 500kg/10a based on the weight of dry matters are 9. 2mm/day and 9. 6mm/day, respectively. 3.The net unit duty of water required in the fields that the maximum planting rate exists is more than the one in the fields that the planting rate is uniform in the planting stage. 4.The determination of net unit duty of water in the late reduction division to heading stage or the planting stage depends upon the daily evapotranspiration and percolation rate in the late reduction division to heading stage or the water depth required for planting and daily consumptive use of water after planting at the planting stage. Therefore the use of figure 5-(1) to figure 5-(6) can easily make the determination of the designed net unit duty of water out of above two kinds of net unit duty of water.

• 물과 미래
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• 제10권2호
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• pp.81-90
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• 1977

The research is conducted to study the effect of the soil physical properties in the direct sowing culture on the water requirement, growth, and yield of rice with Early-Tongil at the experimental paddy field of the Sangju agri. and seri. junior college in Keyngbuk province from 6th May to 15th September in 1977. The experimental plots are designed with the four plots which are non-irrigated standard (plowing to 15cm), non-irrigated deep lowed (plowing to 25cm), irrigated standard (plowing to 15cm), and irrigated deep plowing plot (plowing to 25cm) and also each plot is repreated four times by the split plot design. The results obtained are summarized as follows: 1) The soil sample was ML to 10cm depth from ground surface and those from 10cm to 20cm depth and from 20cm to 30cm were CL. Each specific gravity was 2. 6, 2. 6 and 2. 7. 2) The weather during culturing period was the sane as the normal year of mean temperature. The precipitation was little and the distribution of it was disordered comparing to normal year but the heavy sunshine gave good effect on ripening. 3) Percolation loss was increased more at the non-irrigated plot than at the irrigated plot, and that of deep-plowed plot was increased more. 4) Grain yield per 10a. of non-irrigated deep plowed plot was 898kg, it was greated than others but there wa no significance. 5) A significant difference in the number of spikelets per panicle was found between nonirrigated plot and irrigated plot, and the number of spiklelets per panicle at the nonirrigated plot was more than that of the irrigated plot. But there was no significance in the other yield components-number of panicle, fertility abd ripening ratio-at the irrigated plot, ut weight of 100 grains was higher at non-irrigated plot. 6) Yield and growth at the deep plowed plot were higher than those of standard plowed plot.

• 한국농공학회지
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• 제36권3호
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• pp.47-59
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• 1994

The irrigation reservoir operation models developed were tested with weather and field data, and the sensitivity of the water requirement deficiency indices(WRDI) were checked with different initial reservoir storages, irrigated areas, and other water uses from the reservoir storage. Seven reservoir release rules were applied to Yongseol Reservoir. Twenty year WRDIs were computed to check performances of those reservoir release rules. Mean WRDIs were 138, 198, 198, 200, 240, 344, and 1033mm for ROM, TOS, COS, CRR, MSC, FAS, and SRC, respectively. The results indicated that ROM contributes consistently to higher operation efficiencies of an irrigation reservoir. The test results of LFROM and SFROM showed that reservoir operation with the proposed optimization technique ROM would be better suited for an irrigation district than those with the other rules. And the proposed model could be used as a tool to improve reservoir operations.

• 한국작물학회지
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• 제38권3호
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• pp.290-295
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• 1993

수도 무경기 기계이앙 재배시 수도수량과 토양특성 변화를 구명하기 위하여 무경운을 포함한 논토양 특성에 맞는 최소경운 방법을 확립코자 미사 질식토, 사양토, 미사질양토의 3개 포장에서 경운방법을 달리하여 화성벼를 재배하면서 수도 수량과 토양특성을 조사, 분석한 결과는 다음과 같다. 1. 무경기구의 수온과 지온은 제 일 낮았으나 처리간에 온도차이는 크지 않았다. 2. 토성별 평균감수심은 사양토에서 가장 많았고 미사질식토에서 가장 적었는데 무경윤구의 감수심이 다른 처리구보다 1.4～2.2mm/일 많았다. 3. 수확기때 수도체의 무기함량은 무경기시 다른 처리구에 비하여 미사질식토에서는 $Na_2$O 함량을 제외하고는 가장 높았다. 4. 무경운구의 수양감수는 경운기 경운+로타리구에 비하여 사양토에서 18%, 미사질식토에서 7%, 미사질양토에서 1%감수되었다.

• 한국수산과학회지
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• 제43권1호
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• pp.54-62
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• 2010

With the aim of developing and indoor overwintering technique for Pearl oyster, Pinctada fucata martensii, the metabolic rates of young oysters (52.4-83.0 mm in shell length) were measured for 2 weeks at water temperatures of 8, 10, 12, and $14^{\circ}C$. The filtration rate (FR) ranged 0 to $4.84\;L\;h^{-1}gDW^{-1}$ (mean, $0.02{\pm}0.06 $ to $3.12{\pm}1.45$), with significant changes observed over thme except for the case of a water temperature of $14^{\circ}C$. Respiration rate (R) ranged from 0 to $2.370\;mgO2\;h^{-1}gDW^{-1}$ (mean, 0 to $1.77{\pm}0.37$), with significant respiratory disorders observed at temperatures below $12^{\circ}C$; in contrast, the rate increased on the $14^th$ day of the experiment in the case of a temperature of 14$^{\circ}C$. No significant difference was observed among the different water temperatures in terms of excretion rate (E) or absorption efficiency (Abs.eff), except for a significant decrease in aerobic metabolism in the case of water temperature of $8^{\circ}C$. The estimated scope for growth (SFG) ranged from -9.1 to $126.9\;J\;h^{-1}gDW^{-1}$ (mean. $-4.1{\pm}2.6$ to $82.85{\pm}42.6$). A significant energy Joss was found at $8^{\circ}C$, with negative SFG observed throughout the experiment and a gradual energy decrease observed over time at water temperatures of $10^{\circ}C$ and 120C. However. SFG remained positive throughout the experiment in the case of $14^{\circ}C$. The estimated minimum energy requirement, assessed from energy expenditure, is $8.00-34.24\;J\;h^{-1}gDW^{-1}$ (mean, $17.67{\pm}6.17$). In conclusion, the lowest temperature suitable for indoor overwintering is above $14^{\circ}C$.

• 한국농림기상학회지
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• 제6권1호
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• pp.18-23
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• 2004

본 연구는 우리나라 중부지방의 소나무 천연 임분을 대상으로 입지환경별 생장 및 수분생리 특성을 파악하여 합리적인 경영방안을 제시하기 위하여 수행되었다. 연구 대상지의 소나무림은 평균 206.5㎥/ha을 나타냈으며, 각 방위별로 본수, 단면적, 재적 등의 임분 통계량을 보면 북사면에서 남사면으로 갈수록 증가하는 경향을 보이고 있지만 연년생장량과 10년 간의 정기평균 생장량은 반대로 남사면에서 가장 낮은 값을 나타내고 있다. 오후 12∼14시 사이에 측정된 최대 수분포텐셜(Ψ$_{w}$)을 각 방위 및 고도별로 구분하며 분석한 결과 소나무는 북사면에서 남사면으로 가면서 수분포텐셜이 낮아지는 경향을 보였으며, 고도별 수분포텐셜은 상부에서 하부로 가면서 증가하였다. 각 방위별 토양 수분함량은 북사면에서 남사면으로 가면서 감소하는 경향을 나타냈고, 토양 수분함량에 따른 소나무의 수분포텐셜은 고도의 음의 상관관계를 나타냈다. 따라서 연구 대상지의 소나무는 남사면과 능선에서 수분 요구도가 높은데, 이는 이곳에서의 많은 증발량에 따른 수분 결핍에 의한 종내 수분 경쟁의 결과로 판단된다..

• 한국토양비료학회지
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• 제23권2호
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• pp.114-118
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• 1990

제염(除鹽)에 소요(所要)되는 수량(水量)을 밝히기 위(爲)하여 유리컬림에 담는 염토(鹽土) 100g 중(中) 10g에 석고반량(石膏半量)을 섞어서 최상층(最上層)으로 하고 나머지 반량(半量)을 표면(表面)에 편후(後) 증류수(蒸溜水)로 세척(洗滌)하여 투과수(透過水)와 6단층(段層)으로 절단건조(切斷乾燥)한 토양(土壤)을 분석(分析)하였으며 얻은 결과는 다음과 같다. 1. 염토층(鹽土層)의 1.7배(倍)에 상당(相當)하는 투과수(透過水)로 Na는 제염(除鹽)($Na/{\sqrt{Ca+Mg)}}$ 비(比) = 0.1, $Na/{\sum}Cat$. = $1.64{\pm}0.57%$)되었으나 Mg는 2.0배(倍)의 물로도 제거(除去)되지 못하여 각 층(層)의$(Na+{\sqrt{Mg}})/(K+{\sqrt{Ca}})$비(比)가 한 점(點)으로 수렴(收斂)되지 못하였다. 2. 유리(遊離)NaCl는 염토(鹽土)의 1.4배(倍)의 투과수(透過水)에 거의 다 세탈(洗脫)되었으며, 그 이상(以上)의 투과(透過)로 Mg와 K의 세탈(洗脫)이 많아졌다. 3. 염토일정(鹽土一定)깊이까지를 일정농도(一定濃度)로 제염(除鹽)하는 투과수량(透過水量)의 조견표(早見表)를 제시(提示)하였다.