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논 관개 지역의 지하수위 관측을 통한 시공간적 지하수위 변동 특성 분석
장민원,박기욱,김성준,배승종,Jang, Min-Won,Park, Ki-Wook,Kim, Seong Joon,Bae, Seung-Jong 한국농공학회 2015 한국농공학회논문집 Vol.57 No.6
This study aimed to establish a field observation system for monitoring tempo-spatially precise changes of groundwater level and to analyze the impact of rainfall and irrigation practices on groundwater changes in paddy regions. The monitoring system comprising of all nine groundwater observation wells and four ponding depth sensors was installed in a part of paddy regions benefited from Gosam reservoir, Ansung-si. The result of grundwater level change during the irrigation period in 2002 was averagely 0.51 m higher than that during the non-irrigation period. In particular between March before puddling and June after transplanting, there was maximum 1.23 m rise in groundwater level. On the other hand, concerning the change in ponding depth, groundwater level changed similarly, and hourly rainfall was revealed to have better correlation with 24-hour delayed hourly groundwater level than with the corresponding groundwater level. Eventually, this study could be referenced for further studies to set up a more comprehensive and sustainable monitoring system of groundwater conditions.
장민원,이현정,김이현,홍석영,Jang, Min-Won,Lee, Hyeon-Jeong,Kim, Yi-Hyun,Hong, Suk-Young 한국농공학회 2011 한국농공학회논문집 Vol.53 No.6
This study discussed the applicability of satellite SAR (Synthetic Aperture Radar) imagery with regard to reservoir monitoring, and tried the extraction of reservoir storage from multi-temporal C-band RADARSAT-1 SAR backscattering images of Yedang and Goongpyeong agricultural reservoirs, acquired from May to October 2005. SAR technology has been advanced as a complementary and alternative approach to optical remote sensing and in-situ measurement. Water bodies in SAR imagery represent low brightness induced by low backscattering, and reservoir storage can be derived from the backscatter contrast with the level-area-volume relationship of each reservoir. The threshold segmentation over the routine preprocessing of SAR images such as speckle reduction and low-pass filtering concluded a significant correlation between the SAR-derived reservoir storage and the observation record in spite of the considerable disagreement. The result showed up critical limitations for adopting SAR data to reservoir monitoring as follows: the inappropriate specifications of SAR data, the unreliable rating curve of reservoir, the lack of climatic information such as wind and precipitation, the interruption of inside and neighboring land cover, and so on. Furthermore, better accuracy of SAR-based reservoir monitoring could be expected through different alternatives such as multi-sensor image fusion, water level measurement with altimeters or interferometry, etc.
재해 취약성 평가를 위한 기상자료 처리 프로그램 MetSystem 개발
장민원 ( Min Won Jang ),김상민 ( Sang Min Kim ) 한국농촌계획학회 2013 농촌계획 Vol.19 No.4
재해 취약성 평가에 사용되는 다양한 변수들 중 기상 자료의 경우는 다양한 형태로 사용되고 있으며 경우에 따라 새로운 형태로 생성 혹은 시험될 수 있어야 하므로 방대한 기상자료를 간단하게 검색하고 추출할 수 있는 자료 처리 시스템의 개발이 요구된다. 이에 본 연구는 재해 취약성 평가에 사용되는 기상변수를 자유롭게 생성하고 시험하기 위하여 전국 기상자료를 데이터베이스로 구축하고 웹브라우저 기반의 사용자 인터페이스로부터 기상자료를 추출, 가공할 수 있는 MetSystem을 개발하였다. 전국 규모의 방대한 기상자료를 처리하기 위해 Oracle DBMS기반으로 데이터베이스 스키마를 설계하였고 사용자가 언제 어디서나 접근하여 사용할 수 있도록 JAVA 언어를 사용하여 웹브라우저 인터페이스 형태로 구현하였다. MetSystem은 일기상자료를 지점, 기간, 항목, 통계, 범위 등의 조건을 사용자가 자유롭게 선택하여 조회하고 화면에 출력하는 기능을 제공하며 필요에 따라 텍스트나 엑셀 형태로 변화하여 저장할 수 있는 옵션도 포함한다. 이로써 기상변수와 관련하여 반복분석과 새로운 변수 추출이 간단하게 이뤄질 수 있으므로 재해 취약성 분석 연구에 수반되는 다양한 시도를 원활하게 수행 하는데 기여할 수 있을 것이다. Climate change is the most direct threatening factors in sustaining agricultural productivity. It is necessary to reduce the damages from the natural hazards such as flood, drought, typhoons, and snowstorms caused by climate change. Through the vulnerability assessment to adapt the climate change, it is possible to analyze the priority, feasibility, effect of the reduction policy. For the vulnerability assessment, broad amount of weather data for each meterological station are required. Making the database management system for the meteorologic data could troubleshoot of the difficulties lie in handling and processing the weather data. In this study, we generated the meteorologic data retrieval system (MetSystem) for climate change vulnerability assessment. The user interface of MetSystem was implemented in the web-browser so as to access to a database server at any time and place, and it provides different query executions according to the criteria of meteorologic stations, temporal range, meteorologic items, statistics, and range of values, as well as the function of exporting to Excel format (*.xls). The developed system is expected that it will make it easier to try different analyses of vulnerability to natural hazards by the simple access to meteorologic database and the extensive search functions.
장민원 ( Jang Min Won ),최진용 ( Choi Jin-yong ),유승환 ( Yoo Seung-hwan ),이상현 ( Lee Sang Hyun ),박정호 ( Park Jung Ho ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
This study aimed to develop drought indices using MODIS(MODerate resolution Imaging Spectroradiometer) images in North Korea. First, a couple of vegetation indices were generated which explain the relative severity of drought: VCI(Vegetation Condition Index) and SVI(Standardized Vegetation Index). Then, a comparative study was tried on the correlation between both indices with different drought indication including the history of drought damages. In the end, this study is expected to build up the systematic strategy for monitoring drought condition throughout North Korea.
NOAA/AVHRR NDVI를 이용한 북한지역 봄 가뭄 분석
장민원 ( Jang Min-won ),유승환 ( Yoo Seung-hwan ),최진용 ( Choi Jin-yong ) 한국농공학회 2007 한국농공학회논문집 Vol.49 No.6
Different vegetation indices from satellite images have been used for monitoring drought damages, and this study aimed to develop a drought index using NOAA/AVHRR NDVI(Normalized Difference Vegetation Index) and to analyze the temporal and spatial distribution of spring drought severity in North Korea from 1998 to 2001. A new drought index, DevNDVI(Deviation of NDVI), was defined as the difference between a monthly NDVI and average monthly NDVI at the same cover area, and the DevNDVI images at all years except for 2001 demonstrated the drought-damaged areas referred from various domestic and foreign publications. The vegetation of 2001 showed high vitality despite the least amount of rainfall among the target years, and the reason was investigated that higher temperature above normal average would shift the growing stages of plants ahead. Therefore, complementary methods like plant growth models or ground survey data should be adopted in order to evaluate drought-induced plant stress using satellite-based NDVI and to make up for the distortion induced by other environments than lack of precipitation.
가뭄대책 행정지원을 위한 지역논가뭄평가모형 ADEM의 개발
장민원 ( Jang Min Won ),정하우 ( Jeong Ha U ),박기욱 ( Park Gi Ug ) 한국농촌계획학회 2003 농촌계획 Vol.9 No.2
The objectives of this study are to develop an agricultural drought evaluation model based administrative boundaries and to assist the effective drought-related decision-making of local governments. The model which was named ADEM(Administrative Drought Evaluation Model for Paddies) is designed to simulate daily water balance between available water quantities from various agricultural water facilitied such as agricultural drought severity, two indices were defined; One is ADFP (Agricultural Drought Frequency for Paddies) which is calculated with a frequency analysis of monthly water deficit, and the other is ADIP(Agricultural Drought Index for Paddies) with a scale of -4.2~+4.2. The developed model was applied to Yeoju district and showed good correspondence with the historical records of drought.
장민원 ( Min-won Jang ),황승재 ( Seung-jae Hwang ),김상민 ( Sang-min Kim ) 한국농공학회 2019 한국농공학회 학술대회초록집 Vol.2019 No.-
2018년 기준 경남의 시설재배 면적은 약 14,288 ha로 전국 (81,195 ha)에서 가장 큰 비중 (17.5%)을 차지하였다. 또한, 양액재배 시설면적도 약 899 ha (전국 3,355 ha의 27.7%)로 경남이 전국에서 가장 앞서고 있다. 양액재배는 작물의 생산성을 극대화할 수 있는 장점으로 2010년 이래 매해 평균 300 ha씩 면적이 증가하였고, 최근 스마트팜의 도입에 따라 향후 재배면적이 더욱 커질 것으로 추정된다. 하지만 양액재배로 인한 폐양액, 폐배지, 재배작물 폐기물 등의 발생과 이로 인한 하천, 지하수, 저수지 등의 수질 및 토양오염, 비료손실 등의 우려도 커지고 있다. 이에 수자원을 절약하고 배출부하량을 저감할 수 있는 순환식 양액재배 시스템의 도입이 장려되고 있으나, 높은 초기 비용과 관리 기술 및 전문인력의 부족 때문에 국내에선 여전히 비순환식 양액재배가 주를 이루고 있다. 본 연구는 순환식 양액재배 시스템의 확산을 강화하기 위한 정책과 제도 마련을 위해 경남지역의 양액재배 실태를 우선 파악하고자 하였다. 국가농식품통계서비스, 농림사업정보시스템 등이 제공하는 시도단위 통계자료는 물론 경남의 시군별, 읍면동별로 3대 주요 시설채소 (토마토, 파프리카, 딸기)에 대한 양액재배 형태별 규모를 정리함으로써 배출부하량 관리가 요구되는 양액재배 밀집지역과 환경오염 민감지역을 파악하는데 활용할 계획이다.