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한국농공학회> 한국농공학회논문집> 물수지 기반 지역별 토양수분을 활용한 밭가뭄 평가

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물수지 기반 지역별 토양수분을 활용한 밭가뭄 평가

Assessment of Upland Drought Using Soil Moisture Based on the Water Balance Analysis

전민기 ( Jeon¸ Min-gi ) , 남원호 ( Nam¸ Won-ho ) , 양미혜 ( Yang¸ Mi-hye ) , 문영식 ( Mun¸ Young-sik ) , 홍은미 ( Hong¸ Eun-mi ) , 옥정훈 ( Ok¸ Jung-hun ) , 황선아 ( Hwang¸ Seonah ) , 허승오 ( Hur¸ Seung-oh )
  • : 한국농공학회
  • : 한국농공학회논문집 63권5호
  • : 연속간행물
  • : 2021년 09월
  • : 1-11(11pages)
한국농공학회논문집

DOI

10.5389/KSAE.2021.63.5.001


목차

Ⅰ. 서 론
Ⅱ. 재료 및 방법
Ⅲ. 적용 및 고찰
Ⅳ. 결 론
감사의 글
REFERENCES

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초록 보기

Soil moisture plays a critical role in hydrological processes, land-atmosphere interactions and climate variability. It can limit vegetation growth as well as infiltration of rainfall and therefore very important for agriculture sector and food protection. Recently, due to the increased damage from drought caused by climate change, there is a frequent occurrence of shortage of agricultural water, making it difficult to supply and manage stable agricultural water. Efficient water management is necessary to reduce drought damage, and soil moisture management is important in case of upland crops. In this study, soil moisture was calculated based on the water balance model, and the suitability of soil moisture data was verified through the application. The regional soil moisture was calculated based on the meteorological data collected by the meteorological station, and applied the Runs theory. We analyzed the spatiotemporal variability of soil moisture and drought impacts, and analyzed the correlation between actual drought impacts and drought damage through correlation analysis of Standardized Precipitation Index (SPI). The soil moisture steadily decreased and increased until the rainy season, while the drought size steadily increased and decreased until the rainy season. The regional magnitude of the drought was large in Gyeonggi-do and Gyeongsang-do, and in winter, severe drought occurred in areas of Gangwon-do. As a result of comparative analysis with actual drought events, it was confirmed that there is a high correlation with SPI by each time scale drought events with a correlation coefficient.

UCI(KEPA)

간행물정보

  • : 농학분야  > 농공학
  • : KCI등재
  • :
  • : 격월
  • : 1738-3692
  • : 2093-7709
  • : 학술지
  • : 연속간행물
  • : 2004-2021
  • : 1189


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KCI등재

1APEX-paddy 모델을 활용한 SSPs 시나리오에 따른 논 필요수량 변동 평가

저자 : 최순군 ( Choi Soon-kun ) , 조재필 ( Cho Jaepil ) , 정재학 ( Jeong Jaehak ) , 김민경 ( Kim Min-kyeong ) , 엽소진 ( Yeob So-jin ) , 조세라 ( Jo Sera ) , 오수당콰에릭 ( Owusu Danquah Eric ) , 방정환 ( Bang Jeong Hwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 1-16 (16 pages)

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Global warming due to climate change is expected to significantly affect the hydrological cycle of agriculture. Therefore, in order to predict the magnitude of climate impact on agricultural water resources in the future, it is necessary to estimate the water demand for irrigation as the climate change. This study aimed at evaluating the future changes in water demand for irrigation under two Shared Socioeconomic Pathways (SSPs) (SSP2-4.5 and SSP5-8.5) scenarios for paddy rice in Gimje, South Korea. The APEX-Paddy model developed for the simulation of paddy environment was used. The model was calibrated and validated using the H2O flux observation data by the eddy covariance system installed at the field. Sixteen General Circulation Models (GCMs) collected from the Climate Model Intercomparison Project phase 6 (CMIP6) and downscaled using Simple Quantile Mapping (SQM) were used. The future climate data obtained were subjected to APEX-Paddy model simulation to evaluate the future water demand for irrigation at the paddy field. Changes in water demand for irrigation were evaluated for Near-future-NF (2011-2040), Mid-future-MF (2041-2070), and Far-future-FF (2071-2100) by comparing with historical data (1981-2010). The result revealed that, water demand for irrigation would increase by 2.3%, 4.8%, and 7.5% for NF, MF and FF respectively under SSP2-4.5 as compared to the historical demand. Under SSP5-8.5, the water demand for irrigation will worsen by 1.6%, 5.7%, 9.7%, for NF, MF and FF respectively. The increasing water demand for irrigating paddy field into the future is due to increasing evapotranspiration resulting from rising daily mean temperatures and solar radiation under the changing climate.

KCI등재

2비닐하우스 기초 토양의 다짐률 변화에 따른 전단강도 특성

저자 : 임성윤 ( Lim Seongyoon ) , 허기석 ( Heo Giseok ) , 곽동엽 ( Kwak Dongyoup )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 17-26 (10 pages)

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Greenhouses have been damaged due to the uplift pressure from strong wind, for which rebar piles are often installed near the greenhouse to resist the pressure. For the effective design of rebar piles, it is necessary to access the shear strength of soil on which the greenhouse is constructed. This study experimentally evaluates the shear strength of the soil beneath the greenhouse. Four soil samples were collected from four agricultural sites, and prepared for testing with 75, 80, 85, and 90% compaction rates. One-dimensional unconfined compression test (UC), consolidated-undrained triaxial test (CU), and resonant column test (RC) were performed for the evaluation of shear strength and shear modulus. Generally, the higher shear strength and modulus were observed with the higher compaction rates. In particular, the UC shear strength increases with the increase of #200 sieve passing rate. Resulting from the CU test, the sample with the most of coarse soil had the highest friction angle, but the variation is small among samples. Resulting from the CU and RC tests, the ratio of maximum shear modulus with the major principle stress at failure was the higher at the finer soil. The ratio was two to three times greater than the ratio from the standard sand. This indicates that the shear strength is lower for the fine soil than the coarse soil at the same shear modulus. The results of this study will be a useful resource for the estimation of the pull-out strength of the rebar pile against the uplift pressure.

KCI등재

3토지피복지도를 이용한 저수지 수혜구역 농경지 면적 및 변화 추이 분석

저자 : 권채린 ( Kwon Chaelyn ) , 박진석 ( Park Jinseok ) , 장성주 ( Jang Seongju ) , 신형진 ( Shin Hyungjin ) , 송인홍 ( Song Inhong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 27-37 (11 pages)

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Conversion of rice paddy field to upland has been accelerated as the central government incentivizes more profitable upland crop cultivation. The objective of this study was to investigate the current status and conversion trend from paddy to upland for the reservoir irrigation districts. Total 605 of reservoir irrigation districts whose beneficiary area is greater than 200 ha were selected for paddy-to-upland conversion analysis using the land cover maps provided by the EGIS of the Ministry of Environment. The land cover data of 2019 was used to analyze up-to-date upland conversion status and its correlation with city proximity, while land cover change between 2007 and 2019 was used for paddy-to-upland conversion trend analysis. Overall 14.8% of the entire study reservoir irrigation area was converted to upland cultivation including greenhouse and orchard areas. Approximately the portion of paddy area was reduced by 17.8% on average, while upland area was increased by 4.9% over the 12 years from 2007 to 2019. This conversion from paddy to upland cultivation was more pronounced in the Gyoenggi and Gyeongsang regions compared to other the Jeolla and Chungcheong provinces. The increase of upland area was also more notable in proximity of the major city. This study findings may assist to identify some hot reservoir districts of the rapid conversion to upland cultivation and thus plan to transition toward upland irrigation system.

KCI등재

4이미지 분석을 통한 서양측백나무의 광학적 공극도 산정 및 공기역학계수와의 상관성 평가

저자 : 장동화 ( Jang Dong-hwa ) , 양가영 ( Yang Ka-young ) , 김종복 ( Kim Jong-bok ) , 권경석 ( Kwon Kyeong-seok ) , 하태환 ( Ha Taehwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 39-47 (9 pages)

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Reduction effect of the spread of odorant and fine dust through windbreak trees can be predicted through numerical analysis. However, there is a disadvantage that a large space and destructive experiments must be carried out each time to calculate the aerodynamic coefficient of the tree. In order to overcome these shortcomings, In this study, we aimed to estimate the aerodynamic coefficient (C0, C1, C2) by using image processing. Thuja occidentalis, which can be used as windbreak were used as the material. The leaf area index was estimated from the leaf area ratio using image processing with leaf weight, and the optical porosity was calculated through image processing of photos taken from the side while removing the leaves step-by-step. Correlation analysis was conducted with the aerodynamic coefficient of Thuja occidentalis calculated from the wind tunnel test and leaf area index and optical porosity calculated from the image analysis. The aerodynamic coefficient showed positive and negative correlations with the leaf area index and optical porosity, respectively. The results showed that the possibility of estimating the aerodynamic coefficient using image processing.

KCI등재

5남한지역 일단위 강우량 공간상세화를 위한 BCSA 기법 적용성 검토

저자 : 황세운 ( Hwang Syewoon ) , 정임국 ( Jung Imgook ) , 김시호 ( Kim Siho ) , 조재필 ( Cho Jaepil )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 49-60 (12 pages)

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BCSA (Bias-Correction and Stochastic Analog) is a statistical downscaling technique designed to effectively correct the systematic errors of GCM (General Circulation Model) output and reproduce basic statistics and spatial variability of the observed precipitation filed. In this study, the applicability of BCSA was evaluated using the ASOS observation data over South Korea, which belongs to the monsoon climatic zone with large spatial variability of rainfall and different rainfall characteristics. The results presented the reproducibility of temporal and spatial variability of daily precipitation in various manners. As a result of comparing the spatial correlation with the observation data, it was found that the reproducibility of various climate indices including the average spatial correlation (variability) of rainfall events in South Korea was superior to the raw GCM output. In addition, the needs of future related studies to improve BCSA, such as supplementing algorithms to reduce calculation time, enhancing reproducibility of temporal rainfall patterns, and evaluating applicability to other meteorological factors, were pointed out. The results of this study can be used as the logical background for applying BCSA for reproducing spatial details of the rainfall characteristic over the Korean Peninsula.

KCI등재

6간월호 유역의 토지이용 및 기후변화에 따른 논밭 필요수량 변화 추정

저자 : 김시내 ( Kim Sinae ) , 김석현 ( Kim Seokhyeon ) , 황순호 ( Hwang Soonho ) , 전상민 ( Jun Sang-min ) , 송정헌 ( Song Jung-hun ) , 강문성 ( Kang Moon-seong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 61-75 (15 pages)

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This study aims to assess the changes in crop water requirement of paddy and upland according to future climate and land use changes scenarios. Changes in the spatiotemporal distribution of temperature and precipitation are factors that lower the stability of agricultural water supply, and predicting the changes in crop water requirement in consideration of climate change can prevent the waste of limited water resources. Meanwhile, due to the recent changes in the agricultural product consumption structure, the area of paddy and upland has been changing, and it is necessary to consider future land use changes in establishing an appropriate water use plan. Climate change scenarios were derived from the four GCMs of the CMIP6, and climate data were extracted under two future scenarios, namely SSP1-2.6 and SSP5-8.5. Future land use changes were predicted using the FLUS (Future Land Use Simulation) model. Crop water requirement in paddy was calculated as the sum of evapotranspiration and infiltration based on the water balance in a paddy field, and crop water requirement in upland was estimated as the evapotranspiration value by applying Penman-Monteith method. It was found that the crop water requirement for both paddy and upland increased as w e go to the far future, and the degree of increase and variability by time showed different results for each GCM. The results derived from this study can be used as basic data to develop sustainable water resource management techniques considering future watershed environmental changes.

KCI등재

7기계학습을 활용한 오리사 바닥재 수분 발생량 분석

저자 : 김다인 ( Kim Dain ) , 이인복 ( Lee In-bok ) , 여욱현 ( Yeo Uk-hyeon ) , 이상연 ( Lee Sang-yeon ) , 박세준 ( Park Sejun ) , 크리스티나 ( Cristina Decano ) , 김준규 ( Kim Jun-gyu ) , 최영배 ( Choi Young-bae ) , 조정화 ( Cho Jeong-hwa ) , 정효혁 ( Jeong Hyo-hyeog ) , 강솔뫼 ( Kang Solmoe )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 77-88 (12 pages)

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Duck industry had a rapid growth in recent years. Nevertheless, researches to improve duck house environment are still not sufficient enough. Moisture generation of duck house litter is an important factor because it may cause severe illness and low productivity. However, the measuring process is difficult because it could be disturbed with animal excrements and other factors. Therefore, it has to be calculated according to the environmental data around the duck house litter. To cut through all these procedures, we built several machine learning regression model forecasting moisture generation of litter by measured environment data (air temperature, relative humidity, wind velocity and water contents). 5 models (Multi Linear Regression, k-Nearest Neighbors, Support Vector Regression, Random Forest and Deep Neural Network). have been selected for regression. By using R-Square, RMSE and MAE as evaluation metrics, the best accurate model was estimated according to the variables for each machine learning model. In addition, to address the small amount of data acquired through lab experiments, bootstrapping method, a technique utilized in statistics, was used. As a result, the most accurate model selected was Random Forest, with parameters of n-estimator 200 by bootstrapping the original data nine times.

KCI등재

8하천 수질에 대한 어류의 서식처적합도지수 산정 - 피라미를 대상으로 -

저자 : 홍록기 ( Hong Rokgi ) , 박진석 ( Park Jinseok ) , 장성주 ( Jang Seongju ) , 송인홍 ( Song Inhong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 89-100 (12 pages)

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The conservation of stream habitats has been gaining more public attention and fish habitat suitability index (HSI) is an important measure for ecological stream habitat assessment. The fish habitat preference is affected not only by physical stream conditions but also by water quality of which HSI was not available due to the lack of field data. The purpose of this study is to estimate the HSI of Zacco platypus for water quality parameters of water temperature, dissolved oxygen (DO), and biochemical oxygen demand (BOD) using the water environment monitoring data provided by the Ministry of Environment (ME). Fish population data merged with water quality were constructed by spatio-temporal matching of nationwide water quality monitoring data with bio-monitoring data of the ME. Two types of the HSI were calculated by the Instream Flow and Aquatic Systems Group (IFASG) method and probability distribution (Weibull) fitting for the four major river basins. Both the HSIs by the IFASG and Weibull fitting appeared to represent the overall distribution and magnitude of fish population and this can be used in stream fish habitat evaluation considering water quality.

KCI등재

9Terra MODIS 및 Sentinel-2 NDVI의 식생 및 농업 모니터링 비교 연구

저자 : 손무빈 ( Son Moo-been ) , 정지훈 ( Chung Jee-hun ) , 이용관 ( Lee Yong-gwan ) , 김성준 ( Kim Seong-joon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 101-115 (15 pages)

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The purpose of this study is to evaluate the compatibility of the vegetation index between the two satellites and the applicability of agricultural monitoring by comparing and v erifying NDVI (Normalized Difference Vegetation Index) based on S entinel-2 and T erra MODIS (Moderate Resolution Imaging Spectroradiometer). Terra MODIS NDVI utilized 16-day MOD13Q1 data with 250 m spatial resolution, and Sentinel-2 NDVI utilized 10-day Level-2A BOA (Bottom Of Atmosphere) data with 10 m spatial resolution. To compare both NDVI, Sentinel-2 NDVIs were reproduced at 16-day intervals using the MVC (Maximum Value Composite) technique. As a result of time series NDVIs based on two satellites for 2019 and compare by land cover, the average R2 (Coefficient of determination) and RMSE (Root Mean Square Error) of the entire land cover were 0.86 and 0.11, which indicates that Sentinel-2 NDVI and MODIS NDVI had a high correlation. MODIS NDVI is overestimated than Sentinel-2 NDVI for all land cover due to coarse spatial resolution. The high-resolution Sentinel-2 NDVI was found to reflect the characteristics of each land cover better than the MODIS NDVI because it has a higher discrimination ability for subdivided land cover and land cover with a small area range.

KCI등재

10양돈사 내 동물 활동도에 따른 암모니아 및 미세먼지 배출농도 특성 분석

저자 : 박진선 ( Park Jinseon ) , 정한나 ( Jeong Hanna ) , 이세연 ( Lee Se Yeon ) , 최락영 ( Choi Lak Yeong ) , 홍세운 ( Hong Se-woon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 117-129 (13 pages)

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The movement of animals is one of the primary factors that influence the variation of livestock emissions. This study evaluated the relationship between animal activity and three major emissions, PM10, PM2.5, and ammonia gas, in weaning, growing, and fattening pig houses through continuous monitoring of the animal activity. The movement score of animals was quantified by the developed image analysis algorithm using 10-second video clips taken in the pig houses. The calculated movement scores were validated by comparison with six activity levels graded by an expert group. A comparison between PMs measurement and the movement scores demonstrated that an increase of the PMs concentrations was obviously followed by increased movement scores, for example, when feeding started. The PM10 concentrations were more affected by the animal activity compared to the PM2.5 concentrations, which were related to the inflow of external PM2.5 due to ventilation. The PM10 concentrations in the fattening house were 1.3 times higher than those in the weaning house because of the size of pigs while weaning pigs were more active and moved frequently compared to fattening pigs showing 2.45 times higher movement scores. The results also indicated that indoor ammonia concentration was not significantly influenced by animal activity. This study is significant in the sense that it could provide realistic emission factors of pig farms considering animal's daily activity levels if further monitoring is carried out continuously.

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KCI등재

1물수지 기반 지역별 토양수분을 활용한 밭가뭄 평가

저자 : 전민기 ( Jeon¸ Min-gi ) , 남원호 ( Nam¸ Won-ho ) , 양미혜 ( Yang¸ Mi-hye ) , 문영식 ( Mun¸ Young-sik ) , 홍은미 ( Hong¸ Eun-mi ) , 옥정훈 ( Ok¸ Jung-hun ) , 황선아 ( Hwang¸ Seonah ) , 허승오 ( Hur¸ Seung-oh )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 1-11 (11 pages)

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Soil moisture plays a critical role in hydrological processes, land-atmosphere interactions and climate variability. It can limit vegetation growth as well as infiltration of rainfall and therefore very important for agriculture sector and food protection. Recently, due to the increased damage from drought caused by climate change, there is a frequent occurrence of shortage of agricultural water, making it difficult to supply and manage stable agricultural water. Efficient water management is necessary to reduce drought damage, and soil moisture management is important in case of upland crops. In this study, soil moisture was calculated based on the water balance model, and the suitability of soil moisture data was verified through the application. The regional soil moisture was calculated based on the meteorological data collected by the meteorological station, and applied the Runs theory. We analyzed the spatiotemporal variability of soil moisture and drought impacts, and analyzed the correlation between actual drought impacts and drought damage through correlation analysis of Standardized Precipitation Index (SPI). The soil moisture steadily decreased and increased until the rainy season, while the drought size steadily increased and decreased until the rainy season. The regional magnitude of the drought was large in Gyeonggi-do and Gyeongsang-do, and in winter, severe drought occurred in areas of Gangwon-do. As a result of comparative analysis with actual drought events, it was confirmed that there is a high correlation with SPI by each time scale drought events with a correlation coefficient.

KCI등재

2AERMOD를 이용한 축산 미세먼지, 초미세먼지, 암모니아 배출의 대기확산 영향도 분석

저자 : 이세연 ( Lee¸ Se-yeon ) , 박진선 ( Park¸ Jinseon ) , 정한나 ( Jeong¸ Hanna ) , 최락영 ( Choi¸ Lak-yeong ) , 홍세운 ( Hong¸ Se-woon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 13-25 (13 pages)

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The particulate matters (PM10 and PM2.5) and ammonia emitted from livestock farms as dispersed to urban and residential areas can increase the public's concern over the health problem, social conflicts, and air quality. Understanding the atmospheric dispersion of such matters is important to prevent the problems for the regulatory purposes. In this study, AERMOD modeling was performed to predict the dispersion of livestock particulate matters and ammonia in Gwangju metropolitan city and five surrounding cities. The five cities were divided into 40 sub-zones to model the area-based emissions which varied with the number of livestock farms, species and growth stages of the animals. As a result, the concentrations of PM10, PM2.5 and ammonia resulted from livestock farms located in the surrounding cities were 2.00 μg m-3, 0.30 μg m-3 and 0.04 ppm in the southwestern part of Gwangju based on the average concentration of 1 hour. These values accounted for 0.7% of PM10 concentration, 0.5% of PM2.5 concentration, and 0.4% of the ammonia concentration in Gwangju, contributing to a small amount of air pollution compared to other sources. As preventive measures, the plantation was applied to high emission source areas to reduce particulate matters and ammonia emissions by 35% and 31%, respectively, and resulted in decrease of the area of influence by 57% for particulate matters and 59% for ammonia.

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3소규모 저수지의 특성을 고려한 제체 안전진단의 정량적 상태평가 기준 개선

저자 : 전건영 ( Jeon¸ Geonyeong ) , 방돈석 ( Bang¸ Donseok )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 27-38 (12 pages)

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The physical condition assessment criteria of fill dam safety inspection are now weakly regulated and inappropriate for small agricultural reservoirs since these criteria have fundamental backgrounds suitable for large-scale dams. This study proposes the degree (critical values) of defects for the quantitative condition assessment of the embankment in order to prepare the condition assessment criteria for a small reservoir with a storage capacity of less than one (1) million cubic meters. The critical values of defects were calculated by applying the method that considers the size ratios based on the dimensional data of reservoirs, and the method of statistical analysis on the measured values of the defect degree which extracted from comprehensive annual reports on reservoir safety inspection. In comparison with the current criteria, the newly proposed critical values for each condition assessment item of the reservoir embankment are presented in paragraphs 4 and 6 of the conclusion. In addition, this study presents a method of displaying geometric figures to clarify the rating classification for condition assessment items with the two defect indicators.

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4풍동실험에 의한 붐식 살포 농약의 노즐형태와 분사압력에 따른 비산 특성 분석

저자 : 박진선 ( Park¸ Jinseon ) , 이세연 ( Lee¸ Se-yeon ) , 최락영 ( Choi¸ Lak-yeong ) , 정한나 ( Jeong¸ Hanna ) , 노현호 ( Noh¸ Hyun Ho ) , 유승화 ( Yu¸ Seung-hwa ) , 송호성 ( Song¸ Hosung ) , 홍세운 ( Hong¸ Se-woon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 39-47 (9 pages)

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With rising concerns about pesticide spray drifts, this study analyzed the drift patterns of two typically-used nozzles, XR nozzle and AI nozzle, concerning their working pressures and wind speeds by wind tunnel experiments. AI nozzle showed low drift potential with larger droplet sizes compared to XR nozzle. Airborne and deposition drifts of XR nozzle were two times higher than those of AI nozzle under high wind speeds (≥2 m s-1). In all cases, higher working pressures decreased the droplet sizes, thereby increasing the airborne and deposition drifts. Higher wind speeds also resulted in more airborne drifts, while ground deposition was increased under lower wind speeds. These effects of working pressures and wind speeds on the airborne and deposition drifts were observed at leeward distances less than 4 m from the nozzles. However, the airborne and deposition drifts were barely affected by the working pressures and wind speeds at leeward distances more than 11 m. The measurements were fitted to regression models of the drift curve with acceptable R2 values greater than 0.8, demonstrating that further studies will be useful to settle domestic issues of spray drifts.

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5SSP 기후변화 시나리오에 따른 농업용 저수지 홍수조절능력 분석

저자 : 김지혜 ( Kim¸ Jihye ) , 곽지혜 ( Kwak¸ Jihye ) , 황순호 ( Hwang¸ Soonho ) , 전상민 ( Jun¸ Sang Min ) , 이성학 ( Lee¸ Sunghack ) , 이재남 ( Lee¸ Jae Nam ) , 강문성 ( Kang¸ Moon Seong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 49-62 (14 pages)

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The objective of this study was to evaluate the flood control capacity of the agricultural reservoir based on state-of-the-art climate change scenario - SSP (Shared Socioeconomic Pathways). 18 agricultural reservoirs were selected as the study sites, and future rainfall data based on SSP scenario provided by CMIP6 (Coupled Model Intercomparison Project 6) was applied to analyze the impact of climate change. The frequency analysis module, the rainfallrunoff module, the reservoir operation module, and their linkage system were built and applied to simulate probable rainfall, maximum inflow, maximum outflow, and maximum water level of the reservoirs. And the maximum values were compared with the design values, such as design flood of reservoirs, design flood of direct downstream, and top of dam elevation, respectively. According to whether or not the maximum values exceed each design value, cases were divided into eight categories; I-O-H, I-O, I-H, I, O-H, O, H, X. Probable rainfall (200-yr frequency, 12-h duration) for observed data (1973∼2020) was a maximum of 445.2 mm and increased to 619.1∼1,359.7 mm in the future (2011∼2100). For the present, 61.1% of the reservoirs corresponded to I-O, which means the reservoirs have sufficient capacity to discharge large inflow; however, there is a risk of overflowing downstream due to excessive outflow. For the future, six reservoirs (Idong, Baekgok, Yedang, Tapjung, Naju, Jangsung) were changed from I-O to I-O-H, which means inflow increases beyond the discharge capacity due to climate change, and there is a risk of collapse due to dam overflow.

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6풍동실험을 통한 방풍용 서양측백나무와 농업용방풍망의 공기역학계수 평가

저자 : 이소진 ( Lee¸ Sojin ) , 하태환 ( Ha¸ Taehwan ) , 서시영 ( Seo¸ Siyoung ) , 송호성 ( Song¸ Hosung ) , 우샘이 ( Woo¸ Saemee ) , 장유나 ( Jang¸ Yuna ) , 정민웅 ( Jung¸ Minwoong ) , 조광곤 ( Jo¸ Gwanggon ) , 한덕우 ( Han¸ Dukwoo ) , 황옥화 ( Hwang¸ Okhwa )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 63-71 (9 pages)

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Windbreak forests, which have a windproof effect against strong winds, are known to be effective in reducing the spread of odors and dust emitted from livestock farms. The effect of reducing the spread of odors and dust can be estimated through numerical models such as computational fluid dynamics, which require aerodynamic coefficients of the windbreaks for accurate prediction of their performance. In this study, we aimed to evaluate the aerodynamic coefficients, Co, C1, C2, and α, of two windbreaks, Thuja occidentalis and a mesh net, through wind tunnel experiments. The aerodynamic coefficients were derived by the relation between the incoming wind speed and the pressure loss due to the windbreaks which was measured by differential pressure sensors. In order to estimate the change in the aerodynamic coefficient concerning various leaf density, the experiments were conducted repeatedly by removing the leaves gradually in various stages. The results showed that the power law regression model more suitable for coefficient evaluation compared to the Darcy-Forchheimer model.

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7경남지역 딸기, 토마토, 파프리카 양액재배에 따른 발생부하량 비교

저자 : 조현경 ( Cho¸ Hyun Kyung ) , 김상민 ( Kim¸ Sang Min )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 73-81 (9 pages)

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The objective of this study was to analyze the waste nutrient generation loads from hydroponics for three major crops in Gyeongsangnam-do. Study hydroponic farms were selected for the three major crops such as paprika, strawberry, tomato based on the agricultural statistics data and field investigation. The flow amount and water quality for inflow and outflow of study hydroponic farms were monitored and analyzed on a monthly basis. Monitored samples were analyzed in terms of DO, BOD, T -N, T-P, SS, and EC. The generated load of BOD, T -N, and T-P were calculated from the monitored flow and water quality. The monitoring results showed that the drainage ratio for the circular hydroponic farm was lower than the non-circular hydroponic farm because the outflow from the circular hydroponics were much lower than that from the non-circular. The generated load calculation results showed that the BOD tended to have a smaller value than the TMDLs guideline for land, while T-N and T-P showed higher value than that from the TMDLs guideline. In order to effectively manage the pollutant load discharged from the hydroponics farming complex, it is necessary to manage the non-circulating hydroponics farm. To improve water quality, it is necessary to gradually expand the circulating hydroponics farm through policy and economic support.

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8필터링 기법을 이용한 농업용저수지 수위자료의 품질관리 방안

저자 : 김경환 ( Kim¸ Kyung-hwan ) , 최규훈 ( Choi¸ Gyu-hoon ) , 정형모 ( Jung¸ Hyoung-mo ) , 주동혁 ( Joo¸ Donghyuk ) , 나라 ( Na¸ Ra ) , 최은혁 ( Choi¸ Eun-hyuk ) , 권재환 ( Kwon¸ Jae-hwan ) , 유승환 ( Yoo¸ Seung-hwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 83-93 (11 pages)

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Agricultural reservoirs are important facilities for storing or managing water for the purpose of securing agricultural water, creating and expanding agricultural production bases, and using them to increase agricultural production. In particular, the Korea Rural Community Corporation (KRC) manages agricultural reservoirs scattered across the country, and officially recognizes and distributes hydrological data to increase their public utilization and aims to improve the value of water resources. Data on the water level of agricultural reservoirs are important. However, errors such as missing values and outliners limit utilization of the data in various fields of research and industry. Therefore, water quality data measures should be devised to increase reliability. this study categorized different error types and looked at automatic correction methods to enhance the reliability of the vast hydrological data. In addition, the water level data corrected from errors were compared to the reference hydrologic data through expert judgment in accordance with the quality control procedure, and the most appropriate measures were verified. As KRC manages more agricultural reservoirs than any other institution, the proposed method of efficient and automatic water level data correction in this study is expected to increase the availability and reliability of the hydrological data.

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9가뭄사상 및 농업수리시설물이 쌀 생산량에 미치는 영향에 대한 상관 분석

저자 : 우승범 ( Woo¸ Seung-beom ) , 남원호 ( Nam¸ Won-ho ) , 전민기 ( Jeon¸ Min-gi ) , 윤동현 ( Yoon¸ Dong-hyun ) , 김태곤 ( Kim¸ Taegon ) , 성재훈 ( Sung¸ Jae-hoon ) , 김한중 ( Kim¸ Han-joong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 5호 발행 연도 : 2021 페이지 : pp. 95-105 (11 pages)

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Drought is a disaster that causes prolonged and wide scale damage. Recently, the severity and frequency of drought occurrences, and drought damage have been increased significantly due to climate change. As a result, a quantitative study of drought factors is needed to better understand and prevent future droughts. In the case of agricultural drought, several existing studies examine the economic damage caused by droughts and their causes, but these studies are not well suited to estimating crop-oriented agricultural drought damage and the factors that absolutely affect agricultural drought. This study determines which factors most affect agricultural drought. It examines meteorological factors and those related to agricultural water supplied by irrigation facilities. Rice paddy production per unit area is lower than the average from the last two years where agricultural drought occurred. We compare the relative frequency of agricultural drought impacts with irrigation facilities, effective reservoir storage, the number of water supply facilities, and the meteorological drought index such as Standardized Precipitation Index (SPI). To identify factors that affect agricultural drought, we correlate rice paddy production anomalies with irrigation water supply for the past two years. There was a high positive correlation between rice paddy production and irrigation water usage, and there was a low or moderate negative correlation between rice paddy production anomalies compared to the average of the past two years and SPI. As a result, agricultural water supply by irrigation facilities was judged to be more influential than meteorological factors in rice paddy production. This study is expected to help local governments establish policies related to agricultural drought response.

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