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Assessing Potential Damage of Flood Events for Ecosystem Service Account

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2024, 33(6), pp.409-421
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : October 20, 2024
  • Accepted : December 5, 2024
  • Published : December 31, 2024

Tae-Ho Lee 1,  Hee-Jin Moon 1,  Ji-Min Lee 1,  Gum-Sung Cheon 1

1국립생태원

Accredited

ABSTRACT

Climate change increases the frequency and intensity of floods, and damage to life and property caused by floods is increasing. Among various alternatives for flood mitigation, interest in nature-based flood mitigation is gradually increasing. Ecosystem service accounting is being discussed internationally for the purpose of maintaining and preserving natural ecosystems with flood control functions. In order to account for ecosystem services, evaluation of the relevant services must be conducted first. For evaluation, the three elements of 'potential supply capacity of the ecosystem', 'human demand', and 'flow', which is the amount of benefits, and the relationship between them must be considered. In existing flood control ecosystem service evaluation studies, definitions and methodological studies on ecosystem supply capacity contributing to flood control and demand benefiting from it have been limited. However, actual quantification and monetary evaluation of service flow have not been conducted, so the usability of research results in terms of ecosystem accounting is low. In this study, flood control ecosystem service flow in a national basin was estimated in monetary value by applying a flood-depth damage function by land characteristics to areas expected to be flooded. The study results show that the ecosystem service benefits of the upstream ecosystem of the river basin, which controls flooding in the downstream area, received by the country with a 500-year rainfall frequency are estimated to be a total of 25 trillion 4571 billion per year. If the benefits are calculated as annual units for accounting by considering the occurrence probability, it is approximately 50.9 billion won. These results assume that the entire upstream ecosystem of the river basin performs flood functions and that the functions of existing disaster prevention facilities are not being performed. In future studies, to solve these problems, it is necessary to measure the service flow considering existing disaster prevention facilities and conduct research considering various flood frequencies and occurrence probabilities.

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