Evaluation of flood mitigation effectiveness of nature-based solutions potential cases with an assessment model for flood mitigation

Weicheng Lo, Chih Tsung Huang, Meng Hsuan Wu, Dong Jiing Doong, Leng Hsuan Tseng, Chun Hung Chen, Yen Ju Chen

研究成果: Article同行評審

5 引文 斯高帕斯(Scopus)

摘要

In recent years, climate change has been widely discussed around the world. The Intergovernmental Panel on Climate Change (IPCC) published the Sixth Assessment Report (AR6) in 2021, which stated that with the intensification of global warming, heavy rainfalls are becoming more severe and frequent. Economic development in recent years has also caused the proportion of impervious areas in urban regions to increase with the advancement of urbanization. When the two aforementioned factors are coupled together, the result is faster surface runoff speeds and reduced infiltration rates, which in turn result in worse flooding. Thus, water disaster mitigation is becoming a topic of great importance to developed and developing countries. This study examined five Nature-based Solutions (NbS) cases (A, B C, D, E) for the Nangang river in Taiwan. Case A is to design levees with a 100-year return period flood design standard. Under steady flow conditions, floods can be smoothly discharged downstream without any significant inundation in most situations. Case B and C used gabions with a 10-year return period flood design standard and discontinuous levees with a 25-year return period flood design standard, respectively. Though neither case is as effective in flood mitigation, both cases B and C can still reduce inundation from the flooding disaster relatively well. Case D is to dredge local areas of the main channel, but the steady flow simulation showed little flood mitigation effect. Case E is the implementation of “Room for the River”, and employs main channel dredging and floodplain land grading to increase flood conveyance capacity. Case E provides good flood mitigation.

原文English
文章編號3451
期刊Water (Switzerland)
13
發行號23
DOIs
出版狀態Published - 2021 12月 1

All Science Journal Classification (ASJC) codes

  • 地理、規劃與發展
  • 生物化學
  • 海洋科學
  • 水科學與技術

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