농업용수의 잔여 공급계획량 및 수요예측량에 의한 관개 취약시기 산정

남원호,김태곤,최진용,이정재,Nam, Won-Ho,Kim, Tae-Gon,Choi, Jin-Yong,Lee, Jeong-Jae 한국농공학회 2012 한국농공학회논문집 Vol.54 No.5

For optimal reservoir operation and management, there are essential elements including water supply in agricultural reservoir and demand in irrigation district. To estimate agricultural water demand and supply, many factors such as weather, crops, soil, growing conditions cultivation method and the watershed/irrigation area should be considered, however, there are occurred water supply impossible duration under the influence of the variability and uncertainty of meteorological and hydrological phenomenon. Focusing on agricultural reservoir, amount and tendency of agricultural water supply and demand shows seasonally/regionally different patterns. Through the analysis of deviation and changes in the timing of the two elements, duration in excess of water supply can be identified quantitatively. Here, we introduce an approach to assessment of irrigation vulnerable duration for effective management of agricultural reservoir using time dependent change analysis of residual water supply and irrigation water requirements. Irrigation vulnerable duration has been determined through the comparison of water supply in agricultural reservoir and demand in irrigation district based on the water budget analysis, therefore can be used as an improved and basis data for the effective and intensive water management.

농업용수관리를 위한 RFID 기반 무선 센서 네트워크 개발

남원호,김태곤,최진용,김진택,나민철,Nam, Won-Ho,Kim, Tae-Gon,Choi, Jin-Yong,Kim, Jin-Taek,La, Min-Chul 한국농공학회 2011 한국농공학회논문집 Vol.53 No.5

Irrigation facilities are spread over demand area in a low density and exposed in the field requiring efficient operation and maintenance. Thus, it could be more efficient to manage an irrigation system when it is with wireless sensor network (WSN) using RFID (Radio Frequency Identification) application. A WSN, a kind of ubiquitous sensor network composed of wireless network, RFID and database management system was developed for agricultural water management in terms of operational status and maintenance requirements. Identification code for RFID tag was designed and an application for RFID reader was developed for field data collection, and a database management system was constructed for managing irrigation facility attributes. The system was installed in I-dong irrigation districts in Gyounggi-province, Korea and the operated results showed the applicability of the WSN for agricultural water management.

점적관개 시설의 관개균일도 및 성능 평가

남원호,최진용,최순군,홍은미,전상호,허승오,Nam, Won-Ho,Choi, Jin-Yong,Choi, Soon-Kun,Hong, Eun-Mi,Jeon, Sang-Ho,Hur, Seung-Oh 한국농공학회 2012 한국농공학회논문집 Vol.54 No.4

Drip irrigation is a affordable irrigation under structured cultivation. Drip irrigation system with high uniformity can be achieved through effective design, maintenance and management of irrigation systems. Nevertheless the design guidelines have not been established for the drip irrigation system products in domestic and imported considering cultivation method and greenhouse environment in Korea. The objectives of this study were to evaluate the performance of drip irrigation system with uniformity through an experiment. The experiment was conducted to study with nine different types of emitters produced in domestic and imported. Hazen-Williams coefficients were also estimated for the drip emitter through hydraulic simulation for design use. It was found that approximately 91.5 % for 10 cm emitter spacing and 96.2 % for 30 cm emitter spacing of statistical uniformity were observed in respectively. Average emission uniformity was decreased as the reduction of emitter spacing. The results would be used in the drip irrigation system design and guideline construction.

미래 기후변화에 따른 농업용 저수지 용수공급의 불확실성

남원호,홍은미,최진용,Nam, Won-Ho,Hong, Eun-Mi,Choi, Jin-Yong 한국농공학회 2014 한국농공학회논문집 Vol.56 No.2

The impact and adaption on agricultural water resources considering climate change is significant for reservoirs. The change in rainfall patterns and hydrologic factors due to climate change increases the uncertainty of agricultural water supply and demand. The quantitative evaluation method of uncertainty based on agricultural water resource management under future climate conditions is a major concern. Therefore, it is necessary to improve the vulnerability management technique for agricultural water supply based on a probabilistic and stochastic risk evaluation theory. The objective of this study was to analyse the uncertainty of water resources under future climate change using probability distribution function of water supply in agricultural reservoir and demand in irrigation district. The uncertainty of future water resources in agricultural reservoirs was estimated using the time-specific analysis of histograms and probability distributions parameter, for example the location and the scale parameter. According to the uncertainty analysis, the future agricultural water supply and demand in reservoir tends to increase the uncertainty by the low consistency of the results. Thus, it is recommended to prepare a resonable decision making on water supply strategies in terms of using climate change scenarios that reflect different future development conditions.

농업용 저수지 공급량과 수요량의 확률분포 및 신뢰성 해석 기법을 활용한 물 공급 취약성 평가

남원호,김태곤,최진용,이정재,Nam, Won-Ho,Kim, Tae-Gon,Choi, Jin-Yong,Lee, Jeong-Jae 한국농공학회 2012 한국농공학회논문집 Vol.54 No.2

The change of rainfall pattern and hydrologic factors due to climate change increases the occurrence probability of agricultural reservoir water shortage. Water supply assessment of reservoir is usually performed current reservoir level compared to historical water levels or the simulation of reservoir operation based on the water budget analysis. Since each reservoir has the native property for watershed, irrigation district and irrigation water requirement, it is necessary to improve the assessment methods of agricultural reservoir water capability about water resources system. This study proposed a practical methods that water supply vulnerability assessment for an agricultural reservoir based on a concept of probabilistic reliability. The vulnerability assessment of water supply is calculated from probability distribution of water demand condition and water supply condition that influences on water resources management and reservoir operations. The water supply vulnerability indices are estimated to evaluate the performance of water supply on agricultural reservoir system, and thus it is recommended a more objective method to evaluate water supply reliability.

Web-GIS 기반 SWAT 자료 공급 시스템 구축

남원호,최진용,홍은미,김학관,Nam, Won-Ho,Choi, Jin-Yong,Hong, Eun-Mi,Kim, Hak-Kwan 한국농공학회 2009 한국농공학회논문집 Vol.51 No.6

Watershed topographical data is essential for the management for water resources and watershed management in terms of hydrology analysis. Collecting watershed topographical and meteorological data is the first step for simulating hydrological models and calculating hydrological components. This study describes a specialized Web-based Geographic Information Systems, Soil Water Assessment Tool model data generation system, which was developed to support SWAT model operation using Web-GIS capability for map browsing, online watershed delineation and topographical and meteorological data extraction. This system tested its operability extracting watershed topographical and meteorological data in real time and the extracted spatial and weather data were seamlessly imported to ArcSWAT system demonstrating its usability. The Web-GIS would be useful to users who are willing to operate SWAT models for the various watershed management purposes in terms of spatial and weather preparing.

식생가뭄반응지수 (VegDRI)를 활용한 위성영상 기반 가뭄 평가

남원호,장민원,홍석영,Nam, Won-Ho,Tadesse, Tsegaye,Wardlow, Brian D.,Jang, Min-Won,Hong, Suk-Young 한국농공학회 2015 한국농공학회논문집 Vol.57 No.4

The development of drought index that provides detailed-spatial-resolution drought information is essential for improving drought planning and preparedness. The objective of this study was to develop the concept of using satellite-based hybrid drought index called the Vegetation Drought Response Index in South Korea (VegDRI-SKorea) that could improve spatial resolution for monitoring local and regional drought. The VegDRI-SKorea was developed using the Classification And Regression Trees (CART) algorithm based on remote sensing data such as Normalized Difference Vegetation Index (NDVI) from MODIS satellite images, climate drought indices such as Self Calibrating Palmer Drought Severity Index (SC-PDSI) and Standardized Precipitation Index (SPI), and the biophysical data such as land cover, eco region, and soil available water capacity. A case study has been done for the 2012 drought to evaluate the VegDRI-SKorea model for South Korea. The VegDRI-SKorea represented the drought areas from the end of May and to the severe drought at the end of June. Results show that the integration of satellite imageries and various associated data allows us to get improved both spatially and temporally drought information using a data mining technique and get better understanding of drought condition. In addition, VegDRI-SKorea is expected to contribute to monitor the current drought condition for evaluating local and regional drought risk assessment and assisting drought-related decision making.

관개취약성 평가모형 및 군집분석을 활용한 용수공급 위험도 평가

남원호,김태곤,홍은미,Michael J. Hayes,Mark D. Svoboda 한국농공학회 2015 한국농공학회논문집 Vol.57 No.1

Because reservoirs that supply irrigation water play an important role in water resource management, it is necessary to evaluate the vulnerability of thisparticular water supply resource. The purpose of this study is to provide water supply risk maps of agricultural reservoirs in South Korea using irrigationvulnerability model and cluster analysis. To quantify water supply risk, irrigation vulnerability indices are estimated to evaluate the performance of thewater supply on the agricultural reservoir system using a probability theory and reliability analysis. First, the irrigation vulnerability probabilities of 1,346reservoirs managed by Korea Rural Community Corporation (KRC) were analyzed using meteorological data on 54 meteorological stations over the past30 years (1981-2010). Second, using the K-mean method of non-hierarchical cluster analysis and pre-simulation approach, cluster analysis was appliedto classify into three groups for characterizing irrigation vulnerability in reservoirs. The morphology index, watershed area, irrigated area, and ratiobetween watershed and irrigated area are selected as the clustering analysis parameters. It is suggested that the water supply risk map be utilized as a basisfor the establishment of risk management measures, and could provide effective information for a reasonable decision making on drought risk mitigation.

토양유효수분율 기반 밭마뭄 정보 제공 및 밭용수 취약성 평가

남원호,전민기,박찬기,황선아,옥정훈,허승오 한국농공학회 2020 韓國農工學會誌 : 전원과 자원 Vol.62 No.4

A Real-Time Online Drought Broadcast System for Monitoring Soil Moisture Index

남원호,최진용,유승환,B. A. Engel 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.3

Drought is a complex phenomenon that varies in intensity over space and time. Due to the spatial and temporal variabilities of drought, better tools are required to assess its severity and spatial extent at any point. Because agricultural drought is influenced by several factors such as rainfall, soil characteristics, and crop type, we propose an analysis method using the soil moisture index to assess drought conditions. Effective drought management can be achieved using drought monitoring if the current conditions can be assessed and future drought development predicted, and decision-makers have required drought response operations that should be available and accessible for use in a short period of time and need to be updated on the latest drought situation. In this study, we developed a web-based geographic information system technology that can broadcast drought conditions in real-time over the Internet and can assist drought management to improve the quality of their decision-making and increase efficiency and effectiveness due to the demand for interaction between decision-makers in the drought management, particularly during drought response. The primary objective of a real-time online drought broadcast system is to provide real-time drought data accessibility and analysis by permitting access to drought’s intensity, duration, patterns, and clearly illustrating the spatial extent of drought through the Web, and to contribute to better policy and decision making for drought management. Users can access the WWW graphical user interface and be able to readily access for current drought condition, respond to drought events more effectively, and provide comparisons of the current drought event to past events. In addition, users can obtain a daily soil moisture index map and evaluate the severity of the agricultural drought based on soil moisture changes. Our system can be used by decision-makers to assess current drought conditions, thereby allowing for informed drought management decisions. Our real time web-based drought broadcasting system is accessible over the web at the following URL: http://ruralwater.snu.ac.kr/drought.