• 농촌계획
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• 제9권4호
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• pp.1-7
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• 2003

This study was conducted to seek the effective water management method of the irrigation reservoirs. Joongpyong reservoir was selected for the hydrologic monitoring, and investigated from May in 1999 to December in 2001. The water level and amount of outlet discharge were measured, the stage discharge equation as a rating curve was induced, and which were compared to the irrigation water requirements calculated by a daily simulation model. The water balance of Joongpyong reservoir was analyzed, mainly on the reservoir storage ratio during irrigation period. Comparing the observed storage and simulation data, the results of the simulation were well agreed with the measured data.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.1-7
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• 1998

To investigate the water balance in a paddy rice field with the pumping station for irrigation water supply, flow measurements and analysis on various components of water balance were carried out. The investigated area is 103.7 ha, and the irrigation water was supplied for 102 days during the total irrigation period starting from June 1. It was found that the consumption rate was increased as the growing stage was progressed. The variation of evapotranspiration rate was shown same tendency as the consumption rate, while no apparent tendency was found in infiltration rate upon different growing stages. And the ground water input to the area was predominant during the early stage of growing period, while ground water output from the study area was predominant at the end of the growing stage. The range of return flow rate, the ratio of total outflow to total inflow in every decad, was 57.6 to 85.7%. These values are slightly higher than reported values from the other investigation projects.

• 한국농공학회논문집
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• 제46권7호
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• pp.71-80
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• 2004

A system for estimating daily paddy irrigation water requirements was developed to simulate daily stream flows that reflect various upstream and downstream return flows from river basin. Evapotranspiration in paddy fields was estimated using the modified Penman equation. Daily irrigation water requirements of paddy fields were calculated by multiplying the paddy area and the daily decrease in ponding depth. The system was constructed almost completely using images, grids, etc. in Visual Basic 6.0. The developed model was verified in the Damyang dam, and was used to estimate daily paddy irrigation water requirements at 12 small watersheds in Geum river basin for 20 years, from 1983 to 2002, covering paddy field areas of $3,332\~26,422$ ha. The results on the runoff analysis on the inflow to the Daecheong multi-purpose dam with various return flows were satisfactory. They were reasonable compared to the scenario where return flows were not considered.

• 한국농공학회논문집
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• 제56권2호
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• pp.37-46
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• 2014

Water for crop growth were supplied by irrigation in protected cultivation and these are accumulated in the soil and utilized for crop evapotranspiration. The study for analyzing soil moisture characteristics is necessary for adequate irrigation water and soil water management in protected cultivation. Soil moisture content, irrigation water quantity and meteorological data were monitored to analyze soil moisture increment and extraction characteristics in terms of soil layers and cucumber crop growth stages. In first cropping period, the total amount of irrigation water was 5.07 mm/day, soil moisture increment was 4.82 mm/day and soil moisture extraction was 5.56 mm/day. In second cropping period, the total amount of irrigation water was 4.82 mm/day, soil moisture increment was 4.65 mm/day and soil moisture extraction was 4.73 mm/day. Soil moisture extraction rate from 0 to 75 cm is 90.3 % in first cropping period and 79.1 % in second cropping period. The majority irrigation water were consumed in root zone, however, about 15 % of soil moisture were losses by infiltration in lower soil layer. Soil moisture extraction and extraction pattern of cucumber crop calculated in this study can be utilized as a basic data for irrigation water management in protected cultivation.

• 한국농공학회지
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• 제40권2호
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• pp.81-91
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• 1998

Water level of irrigation reservoir during the flood season could be kept to a certain level, so called, flood control level by releasing the flood inflow in advance in order to reduce the peak discharge of next coming flood and the damage of inundation. Concept of restriction intensity of water supply was introduced to evaluate the influence of flood control volume on the irrigation water supply. Restriction intensity can be calculated by multiplying the ratio of restriction to the days of restriction which are obtained from the operation rule curve and daily water level of irrigation reservoir and it has the dimension of % day. The method of restriction intensity was applied to the Yedang irrigation reservoir with the observed data of 30 years to review whether the present flood control volume is reasonable or not, and suggest the optimal flood control volume, if possible.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.30-40
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• 1999

부족 (또는 적자) 조절관개는 용수절약 및 작물수량 증수를 위한 주요 방법중의 하나이다. 부족조절관개는 작물과 물의 관계에 근거를 두고 있다. 부족조절관개의 이론은 Shaanxi 및 Gansu 성에서의 실험자료을 이용하여 분석되었다. 부족조절관래에서의 실용상의 문제점은 ; 작물-물관계의 불확실성, 부족조절관개에서의 적정 생육기와 물부족의 정도, 관개조직과 기술에 대한 부족조절관개의 필요조건등이다.

• 한국관개배수논문집
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• 제18권1호
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• pp.94-102
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• 2011

The aim of this study was to evaluate the load of non-point sources pollutant at a paddy plot located at the valley watershed during irrigation period. Irrigation, runoff and water quality data in the paddy plot were analyzed periodically from June 1 to October 31 in 2005. The observed amount of precipitation, irrigation, runoff for the experimental paddy plot during the irrigation period was 1,297.8, 223.2, and 825.4mm, respectively. Total-N concentrations ranged from 3.73 to 18.10mg/L, which was generally higher than the quality standard of agricultural water (1.0mg/L). Total-P concentrations ranged from 0.111 to 0.243mg/L and the average was 0.139mg/L. The observed runoff pollutants loadings from the paddy plot were measured as 34.4 kg/ha for T-N, 1.0 kg/ha for T-P and 213.8 kg/ha for SS. The non-point sources pollutant load in drainage water depends on rainfall and surface drainage water amount from the paddy plot. We are considering that these results were affected by rainfall as well as hydrological condition, soil management, whether or not fertilizer application, cropping, rice straw and plowing.

• 한국작물학회지
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• 제49권6호
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• pp.441-446
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• 2004

효율적인 물 관리방식 개발의 기초 자료를 얻고자 논의 물 관리 차이가 벼의 생육과 수확량에 미치는 영향을 2002년부터 2003년까지 조사한 결과는 다음과 같다. 1. 물 관리 방법별 벼 생육 및 수량은 DWI는 VSII에 비해 출수기의 초장이 길었고, 경수가 적었으나 유효경 비율은 약간 높았고, VSII의 등숙비율은 다른 물 관리에 비해 $1\%$ 낮아 쌀 수량은 $2.1\%$ 적었으나 통계적 유의성은 없었다. 2. 관개량과 유효강우량 등 총 물 공급량은 DWI에서 777.2mm로 가장 많았고, VS팀에서 527mm로 가장 적어, SII에서는 DWI에 비해 약 $15.9\%$, VSII에서는 $32.2\%$정도의 물 절약효과가 있었다. 3. 절간장은 N3, N4절은 관수심이 깊을수록 길었으며, 간벽두께, 간기중, 줄기직경은 DWI에서 감소하였으나, 좌절중, Pushing resistance는 VSII가 DWI에 비해 매우 높고 도복지수가 낮았다. 4. VSII의 성숙기 근장은 27cm로 DWI보다 깊게 내려갔으며, 토양 표면으로부터 10cm이상 깊이에서는 VSII의 뿌리 발생량이 많았으나, 토양 표면으로부터 10cm까지는 DWI의 뿌리분포가 많았다. 5. 물 관리 차이에 따른 잡초 발생양상은 최고 분얼기에는 VSII가 DWI에 비해 일년생 잡초와 다년생 잡초 모두 본수가 2배 이상 많았으며, 출수기에는 일년생 잡초 본수는 물 관리 차이에 관계없이 비슷하였으나, 다년생 잡초 본수는 VSII에서 DWI에 비해 3배 이상 많았다. 이상의 결과에서 담수심을 얕게 하여 용수를 절약하여도 관행 심수 관개 방식에 비해 벼 생육 및 수량에는 차이가 없었고, 오히려 내도복성을 향상시킬 수 있었으므로 최적 용수 공급량 산출의 기초 자료로 활용할 수 있었다.

• 한국습지학회지
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• 제25권4호
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• pp.297-305
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• 2023

순환관개는 농업유역내 하천수를 상류의 농경지로 재투입시켜 관개용수로써 활용하고 기 사용된 용수는 직접유출 또는 기저유출의 형태로 하천으로 회귀되는 관개방식이다. 순환관개는 용수 및 양분 확보 측면에서 장점이 크지만 순환관개 후 발생하는 회귀수는 과투입된 양분을 함유하고 있어 하천 수질에 악영향을 미칠 것으로 예상된다. 따라서 순환관개에 따른 하천 수질변화에 대한 정량적 분석은 효율적인 농업용수 공급과 수질관리대책 수립을 위해 반드시 필요하다. 유역내 수문 및 오염물질의 순환, 그리고 하천수질에 대한 정량적 영향을 통합적으로 분석하기 위하여 유역모델이 주로 활용되고 있으나 대부분의 유역모델들은 순환관개에 의한 수질 영향을 모의할 수 있는 기능을 제공하고 있지 않다. 이에 본 연구에서는 HSPF(Hydrological Simulation Program-Fortran) 유역모델과 다중 저류지 모델(Multi-reservoir model)을 연계하여 순환관개 시스템 운영에 따른 하천수질 영향을 분석하고자 하였다. 연구 대상 지역은 경상남도 창녕군 계성천 유역내 순환관개를 시행하고 있는 관곡천 소유역으로 농업활동에 의한 오염물질 배출이 주된 지역이다. 먼저 계성천 및 관곡천을 대상으로 구축된 HSPF모델을 활용하여 관개지역에서의 배출수(직접유출 및 기저유출) 및 하천수에 대한 연간 유량 및 수질 변화 시계열 자료를 생성하고 이를 토대로 자체 구축한 다중저류조 모델을 보정한 후 순환관개 모의에 사용하였다. 다중 저류지 모델에서 관곡천 유역을 관개지역과 관곡천 등 두 개의 하위시스템으로 구성하고 순환관개에 따른 하위시스템내 반응(식물흡수, 흡탈착, 및 소멸) 및 하위시스템 간 물 및 물질(질소 및 인)전달 관계를 모의할 수 있도록 하였다. 최종적으로 순환관개 운영 유무에 따라 총 3개의 시나리오를 구성하여 연간 순환관개용수량 변화에 따른 관곡천 수질영향을 분석하였다.

• 한국농공학회지
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• 제42권3호
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• pp.66-75
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• 2000

Effect of reclaimed sewage on the paddy rice culture was examined by field experiment for two consecutive years. The domestic sewage was treated by the constructed wetland and the effluent of the treatment wetland was used for irrigation water. The reclaimed sewage was diluted before irrigation in the first year and it was used without dilution in the second year experiment. Growth components and yields were compared against the control plot where conventional method was applied. And also soil characteristics of the plots before and after reclaimed sewage irrigation were analyzed Generally addition of the reclaimed sewage irrigation didn't affect paddy rice culture adversely and even enhancement was observed. Fertilization was thought to be important factor for rice culture rather than irrigation water quality. Conventional fertilization and reclaimed sewage irrigation which contained high nutrient concentration resulted in better growth and more yield. Unlike widespread concern lodging did not happen even in the case of irrigation with average 90mg/L of T-N and conventional fertilization. Soil characteristics changed after irrigation and significant EC increasing was observed for the reclaimed sewage irrigation plots. From soil analyses salt accumulation could be a more potential problem than nutrients like nitrogen and phosphorus in the use of reclaimed sewage irrigation. Overall reclaimed sewage irrigation was thought to be one of practical alternatives for the ultimate disposal of sewage in rural area.