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Effects of flood mitigation policies under climate change scenarios based on the cost-benefit perspective in the mountainous Korean basin

Author

Listed:
  • Hee Won Jee

    (University of Seoul)

  • Seung Beom Seo

    (University of Seoul)

  • Young-Ho Seo

    (Kangwon National University)

  • Junehyeong Park

    (Kangwon National University)

Abstract

This study aimed to evaluate the effects of combined flood mitigation measures on flood mitigation, cost-benefit, and hydrological system changes in forecasted future floods. Sewer enlargement was implemented in all mitigation scenarios, and two LID (Low Impact Development) measures, green roofs and permeable pavement, were implemented with fractions. Implementing green roofs affected two hydrologic components more, namely, evaporation loss and surface runoff, whereas permeable pavements affected infiltration loss more. Similar to infiltration loss, flood components were more affected by permeable pavements than by green roofs, whereas external outflow increased when implementing only sewer enlargement without LID measures, which may increase downstream damage. The flood damage reduction effects per cost in peak flow and external outflow were clearly better when green roofs were not implemented, which showed higher costs but less impact vis-à-vis flood mitigation. Implementing only sewer enlargement showed the best damage reduction per cost in flooding loss, whereas the amount of flooding loss was significantly larger than that of other scenarios with additional LID measures.

Suggested Citation

  • Hee Won Jee & Seung Beom Seo & Young-Ho Seo & Junehyeong Park, 2025. "Effects of flood mitigation policies under climate change scenarios based on the cost-benefit perspective in the mountainous Korean basin," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 121(15), pages 18033-18056, August.
    • Handle: RePEc:spr:nathaz:v:121:y:2025:i:15:d:10.1007_s11069-025-07503-w
    DOI: 10.1007/s11069-025-07503-w
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    References listed on IDEAS

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    1. Seung Beom Seo & Hee Won Jee & Jaepil Cho & Chansung Oh & Yeora Chae & Sera Jo & Jina Hur, 2024. "Assessment of the flood damage reduction effect of climate change adaptation policies under temperature increase scenarios," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 29(1), pages 1-22, January.
    2. Boyu Feng & Ying Zhang & Robin Bourke, 2021. "Urbanization impacts on flood risks based on urban growth data and coupled flood models," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 106(1), pages 613-627, March.
    3. Günter Blöschl & Andrea Kiss & Alberto Viglione & Mariano Barriendos & Oliver Böhm & Rudolf Brázdil & Denis Coeur & Gaston Demarée & Maria Carmen Llasat & Neil Macdonald & Dag Retsö & Lars Roald & Pet, 2020. "Current European flood-rich period exceptional compared with past 500 years," Nature, Nature, vol. 583(7817), pages 560-566, July.
    4. B. Tellman & J. A. Sullivan & C. Kuhn & A. J. Kettner & C. S. Doyle & G. R. Brakenridge & T. A. Erickson & D. A. Slayback, 2021. "Satellite imaging reveals increased proportion of population exposed to floods," Nature, Nature, vol. 596(7870), pages 80-86, August.
    5. Husnain Tansar & Huan-Feng Duan & Ole Mark, 2022. "Catchment-Scale and Local-Scale Based Evaluation of LID Effectiveness on Urban Drainage System Performance," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(2), pages 507-526, January.
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