Proceedings of the Korea Water Resources Association Conference (한국수자원학회:학술대회논문집)

Korea Water Resources Association (한국수자원학회)
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Exploring the Relationship between the Kinetic Energy and Intensity of Rainfall in Sangju, Korea

  • Van, Linh Nguyen (Dept. of Advanced Science and Technology Convergence, Kyungpook National University) ;
  • Le, Xuan-Hien (Disaster Prevention Emergency Management Institute, Kyungpook National University) ;
  • Yeon, Minho (Dept. of Advanced Science and Technology Convergence, Kyungpook National University) ;
  • Thi, Tuyet-May Do (Dept. of Advanced Science and Technology Convergence, Kyungpook National University) ;
  • Lee, Giha (Dept. of Advanced Science and Technology Convergence, Kyungpook National University)
  • Published : 2022.05.19
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Abstract

The impact of raindrops on the soil surface causes soil detachment, which may be estimated by measuring the kinetic energy (KE) of the raindrops. Since direct measurements of rainfall force on ground surfaces are not generally available, empirical equations are an alternative option to estimate KE from rainfall intensity (I), which has the greatest influence over soil erosion and is easily accessible. Establishing the optimal formulation for the relationship between kinetic energy and rainfall intensity has proven to be difficult. Thus, this research considered thirty-seven rainfall events observed from June 2020 to December 2021 using a laster optical disdrometer erected in Kyungpook National University to examine the characteristics of KE-I relationships. We concentrated our discussion on the formation of two different expressions of the KE, including KE expenditure (KEexp) and KE content (KEcon). The following conclusions were drawn: (1) We employed statistical analysis to demonstrate that the KEexp is more suitable expression for establishing an empirical rule between KE and I than the KEcon. (2) A power-law model was used to find the best correlation between KEexp-I relationship, whereas the best match between KEcon and I were found using an exponential equation.

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Acknowledgement

This subject is supported by Korea Ministry of Environment as "The SS projects; 2019002830001"