Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Assessment of Upland Drought Using Soil Moisture Based on the Water Balance Analysis

물수지 기반 지역별 토양수분을 활용한 밭가뭄 평가

  • Jeon, Min-Gi (Department of Convergence of Information and Communication Engineering, Hankyong National University) ;
  • Nam, Won-Ho (School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, National Agricultural Water Research Center, Hankyong National University) ;
  • Yang, Mi-Hye (Department of Convergence of Information and Communication Engineering, Hankyong National University) ;
  • Mun, Young-Sik (National Agricultural Water Research Center, Hankyong National University) ;
  • Hong, Eun-Mi (School of Natural Resources and Environmental Science, Kangwon National University) ;
  • Ok, Jung-Hun (Divison of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Hwang, Seonah (Divison of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Hur, Seung-Oh (Divison of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration)
  • Received : 2021.04.26
  • Accepted : 2021.06.21
  • Published : 2021.09.30
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Abstract

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.

Keywords

Acknowledgement

본 연구는 농촌진흥청의 공동연구사업의 연구비지원 (과제번호: PJ014813022020)에 의해 수행되었습니다.

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