Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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General Inundation Modeling of Paddy Field Districts Considering Drainage Delay

배수지연을 고려한 논 지구의 범용 침수 모의 기법 개발

  • Jun, Sang Min (Department of Rural Systems Engineering, Seoul National University) ;
  • Lee, Hyun Ji (Department of Rural Systems Engineering, Seoul National University) ;
  • Hwang, Soon Ho (Department of Rural Systems Engineering, Seoul National University) ;
  • Song, Jung-Hun (Department of Agricultural and Biological Engineering & Tropical Research and Education Center, University of Florida) ;
  • Choi, Soon-Kun (Climate Change and Agroecology Division, National Institute of Agricultural Sciences) ;
  • Kang, Moon Seong (Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, Institute of Green Bio Science and Technology, Seoul National University)
  • Received : 2019.05.22
  • Accepted : 2019.07.17
  • Published : 2019.07.31
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Abstract

The objective of this study was to develop a general inundation modeling technique considering the effect of drainage delay in the paddy field districts. In most studies, farmland inundation simulations have been conducted using previously developed watershed models. However, the water cycle in the paddy fields has a different structure from that of the general watershed, and the effect of the drainage delay should be considered. In this study, the drainage delay algorithm was developed using water balance equation, and the inundation modeling was performed for inundation-prone paddy fields located near Doowol stream. As a result, the depth of inundation was 43.1 cm and 45.2 cm, respectively, due to the 100-year and 200-year frequency rainfall. With the operation of drainage pump ($0.1m^3/s$), inundation depths decreased by 5.8 cm and 6.0 cm, respectively, and inundation time reduced by 20 hours and 21 hours, respectively for the 100-year and 200-year frequency rainfall. The result showed that the general inundation modeling technique developed in this study could reflect the effect of drainage delay due to the rise of external water level and the flooding reduction effect by operation of drainage pump. The results of this study are expected to be useful to establish measures for damage caused by farmland inundation.

Keywords

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Fig. 1 Schematic diagram of inundation modeling of paddy field districts considering drainage delay

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Fig. 2 Schematic diagram of drainage on paddy field districts

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Fig. 3 Changes in paddy runoff and water level according to drainage delay

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Fig. 4 Location, stream map and digital elevation model of the study watershed

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Fig. 5 Schematic diagram of irrigation and drainage system in study paddy fields

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Fig. 6 Runoff and ponding depth of paddy fields by 100-year frequency design flood

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Fig. 7 Runoff and ponding depth of paddy fields by 200-year frequency design flood

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Fig. 8 Results of stream stage analysis

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Fig. 9 Comparison of water level changes between study paddy field and Doowol stream (100-year frequency design flood)

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Fig. 10 Comparison of water level changes between study paddy field and Doowol stream (200-year frequency design flood)

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Fig. 11 Comparison of paddy water level changes with and without drainage pump operations

Table 1 Inundation characteristics of study paddy fields

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