[논문]위성영상기반 증발스트레스지수를 활용한 필지단위 논 가뭄 모니터링

이희진; 남원호; 윤동현; 김하영; 우승범; 김대의

doi:10.5389/ksae.2021.63.3.047

위성영상기반 증발스트레스지수를 활용한 필지단위 논 가뭄 모니터링
Drought Monitoring for Paddy Fields Using Satellite-derived Evaporative Stress Index 원문보기

한국농공학회논문집 = Journal of the Korean Society of Agricultural Engineers, v.63 no.3, 2021년, pp.47 - 57

이희진 (Department of Bioresources and Rural Systems Engineering, National Agricultural Water Research Center, Hankyong National University) , 남원호 (School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, National Agricultural Water Research Center, Hankyong National University) , 윤동현 (Department of Convergence of Information and Communication Engineering, Hankyong National University) , 김하영 (School of Social Safety and Systems Engineering, Hankyong National University) , 우승범 (School of Social Safety and Systems Engineering, Hankyong National University) , 김대의 (Rural Research Institute, Korea Rural Community Corporation)

Abstract ▼ AI-Helper

Drought monitoring over paddy field area is an important role as the frequency and intensity of drought due to climate change increases. This study analyzed the applicability of drought monitoring on paddy crops using MODIS-based field surveys. As a satellite-based drought index using evapotranspiration for quantitative drought determination, ESI (Evaporative Stress Index), was applied and calculated through the ratio of MODIS- based actual and potential evapotranspiration. For the irrigated areas of Idong, Gosam, Geumgwang, and Madun reservoirs the availability of irrigation water supply, ponding depth, precipitation, paddy growth were investigated for the paddy field within one grid of MODIS. In addition, the percentile-based ESI drought severity was calculated to compare the growth process of paddy and changes in the drought category of ESI. The Idong area was irrigated about a week later than other reservoirs for the period of water supply, transplanting, and water drainage and the ESI drought category tended to be different. The Gosam, Geumgwang, and Madun area expressed moderate drought prior to the farming season, and indicated normal as the water was supplied. During the water drainage, the drought category intensified, indicating that the water available on land was decreasing. These results demonstrated that the MODIS-based ESI could be an effective tool for agricultural drought monitoring over paddy field area.

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표/그림 (11)

그림 Fig. 1 Location of meteorological stations, reservoirs, irrigation areas, and field survey points
표 Table 1 Descriptions of target reservoirs
그림 Fig. 2 Selection of field survey points based on the spatial resolution of MOD16A2
표 Table 2 The categories of drought in ESI (Lee et al., 2020)
그림 Fig. 3 Temporal changes of ESI value between irrigation areas and field survey point from April to September in 2019 at Gosam reservoir
그림 Fig. 4 The grid-based land use information on the field survey
표 Table 3 Records of irrigation for farming paddy crop based on the field surveys
표 Table 4 Farming activities of target reservoirs from April to September in 2020
표 Table 5 Time series of ESI values from April to September in 2020
표 Table 6 Changes of ESI drought category in farming season from April to September in 2020
그림 Fig. 5 Comparison of reservoir storage, precipitation, ponding depth, and ESI from April to September in 2020

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