위성영상기반 증발스트레스지수를 활용한 필지단위논 가뭄 모니터링
Drought Monitoring for Paddy Fields Using Satellite-derived Evaporation Stress Index
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조회
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다운로드
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참고문헌
키워드
초록
Drought monitoring over paddy field area is an important role as the frequency and intensity of drought due to climate change increases. This studyanalyzed the applicability of drought monitoring on paddy crops using MODIS-based field surveys. As a satellite-based drought index usingevapotranspiration for quantitative drought determination, ESI (Evaporative Stress Index), was applied and calculated through the ratio o f MODIS- basedactual and potential evapotranspiration. For the irrigated areas of Idong, Gosam, Geumgwang, and Madun reservoirs the availability of irrigation watersupply, ponding depth, precipitation, paddy growth were investigated for the paddy field within one grid of MODIS. In addition, the percentile-basedESI drought severity was calculated to compare the growth process of paddy and changes in the drought category of ESI. The Idong area was irrigatedabout a week later than other reservoirs for the period of water supply, transplanting, and water drainage and the ESI drought category tended to bedifferent. The Gosam, Geumgwang, and Madun area expressed moderate drought prior to the farming season, and indicated normal as the water wassupplied. During the water drainage, the drought category intensified, indicating that the water available on land was decreasing. These resultsdemonstrated that the MODIS-based ESI could be an effective tool for agricultural drought monitoring over paddy field area.
Abstract
Drought monitoring over paddy field area is an important role as the frequency and intensity of drought due to climate change increases. This studyanalyzed the applicability of drought monitoring on paddy crops using MODIS-based field surveys. As a satellite-based drought index usingevapotranspiration for quantitative drought determination, ESI (Evaporative Stress Index), was applied and calculated through the ratio o f MODIS- basedactual and potential evapotranspiration. For the irrigated areas of Idong, Gosam, Geumgwang, and Madun reservoirs the availability of irrigation watersupply, ponding depth, precipitation, paddy growth were investigated for the paddy field within one grid of MODIS. In addition, the percentile-basedESI drought severity was calculated to compare the growth process of paddy and changes in the drought category of ESI. The Idong area was irrigatedabout a week later than other reservoirs for the period of water supply, transplanting, and water drainage and the ESI drought category tended to bedifferent. The Gosam, Geumgwang, and Madun area expressed moderate drought prior to the farming season, and indicated normal as the water wassupplied. During the water drainage, the drought category intensified, indicating that the water available on land was decreasing. These resultsdemonstrated that the MODIS-based ESI could be an effective tool for agricultural drought monitoring over paddy field area.
참고문헌 (27)
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