Cost-benefit analysis of adaptation to beach loss due to climate change in Japan

Kazunori Nakajima, Naoki Sakamoto, Keiko Udo, Yuriko Takeda, Eiji Ohno, Masafumi Morisugi, Ryuta Mori

Research output: Contribution to journalArticlepeer-review

Abstract

To measure economic effects of changes in environmental quality caused by climate change in Japan, we estimate beach loss damage costs in Japan and in each prefecture and evaluate the economic effectiveness of hypothetical adaptation measures to restore sandy beaches. For analyses, we use a computable general equilibrium model (CGE) that integrates a utility function with environmental quality factors as an independent variable derived from a recreation demand function in a travel cost method (TCM). We use future projections of beach loss rates in 2081-2100 based on ensemble-mean regional sea-level rise (SLR) for four Representative Concentration Pathway (RCPs) scenarios (RCP2.6, RCP4.5, RCP6.0, and RCP8.5). The main findings of our study are presented as follows. (1) In 2081-2100, beach loss damage costs were estimated respectively as 398.54 million USD per year for RCP2.6, 468.96 (m. USD/year) for RCP4.5, 494.09 (m. USD/year) for RCP6.0, and 654.63 (m. USD/year) for RCP8.5. (2) For all RCPs, six prefectures for which the cost-benefit ratio exceeds 1.0 were Kanagawa, Osaka, Hyogo, Hiroshima, Saga, and Kumamoto. Our hypothetical adaptationmeasure of an artificial beach enhancement is expected to be quite effective as a public works project in these prefectures.

Original languageEnglish
Article number715
JournalJournal of Marine Science and Engineering
Volume8
Issue number9
DOIs
Publication statusPublished - 2020 Sep

Keywords

  • Adaptation
  • Beach loss
  • Climate change
  • Computable general equilibrium model
  • Cost benefit analysis
  • Travel cost method

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Ocean Engineering

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