Global-scale benefit–cost analysis of coastal flood adaptation to different flood risk drivers using structural measures

Tiggeloven, Timothy; de Moel, Hans; Winsemius, Hessel C.; Eilander, Dirk; Erkens, Gilles; Gebremedhin, Eskedar; Diaz Loaiza, Andres; Kuzma, Samantha; Luo, Tianyi; Iceland, Charles; Bouwman, Arno; van Huijstee, Jolien; Ligtvoet, Willem; Ward, Philip J.

doi:https://doi.org/10.5194/nhess-20-1025-2020

Articles | Volume 20, issue 4

https://doi.org/10.5194/nhess-20-1025-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Global- and continental-scale risk assessment for natural...

https://doi.org/10.5194/nhess-20-1025-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 4

Research article

|

17 Apr 2020

Research article |

| 17 Apr 2020

Global-scale benefit–cost analysis of coastal flood adaptation to different flood risk drivers using structural measures

Timothy Tiggeloven, Hans de Moel, Hessel C. Winsemius, Dirk Eilander, Gilles Erkens, Eskedar Gebremedhin, Andres Diaz Loaiza, Samantha Kuzma, Tianyi Luo, Charles Iceland, Arno Bouwman, Jolien van Huijstee, Willem Ligtvoet, and Philip J. Ward

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Final revised paper (published on 17 Apr 2020)
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Preprint (discussion started on 28 Nov 2019)
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Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Referee Comments', Anonymous Referee #1, 06 Jan 2020
- AC1: 'Response to referee 1', Timothy Tiggeloven, 14 Feb 2020
RC2: 'Revisions', Anonymous Referee #2, 07 Jan 2020
- AC2: 'Response to referee 2', Timothy Tiggeloven, 14 Feb 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Reconsider after major revisions (further review by editor and referees) (15 Feb 2020) by Heidi Kreibich

AR by Timothy Tiggeloven on behalf of the Authors (17 Feb 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (23 Feb 2020) by Heidi Kreibich

RR by Anonymous Referee #1 (10 Mar 2020)

Suggestions for revision or reasons for rejection

The revised version of "Global scale benefit-cost analysis of coastal flood adaptation to different flood risk drivers" has improved considerably compared to the initial version of the manuscript. The authors have added text to clarify previously unclear sections and have provided additional detail to contextualize the results. I would suggest accepting the manuscript for publication upon revision of these remaining minor comments:

1. I suggest clearly stating that human-induced subsidence is accounted for in this study already at the beginning of the manuscript as some of the studies cited (see response to comment 2) account for natural subsidence, but not for human-induced subsidence. This way it is clear from the beginning in what ways this study differs from previous work.

2. In response to comment 10, the authors added “[…] The former is used for a ‘middle of the road’ scenario with medium challenges and adaptation […]”. Please add ‘for mitigation’.

3. In response to comment 16, the authors provide a more detailed (and slightly rephrased) explanation for the differences in results between this study and previous work, which are not added to the manuscript. I think it is worth adding the additional points and rephrasing the respective section in the manuscript in order to clarify these points for the readers of the paper as well.

4. The text added to section 3.3 provides important and insightful information to contextualize the results of the study (response to comment 18). However, the statement “[…] In the fossil-fuel based scenario of RCP8.5/SSP5, where adaptation will face high challenges […]” is not correct and should be revised accordingly.

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RR by Ivan Haigh (11 Mar 2020)

ED: Publish subject to technical corrections (14 Mar 2020) by Heidi Kreibich

AR by Timothy Tiggeloven on behalf of the Authors (17 Mar 2020) Author's response Manuscript

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Short summary

We present a framework to evaluate the benefits and costs of coastal adaptation through dikes to reduce future flood risk. If no adaptation takes place, we find that global coastal flood risk increases 150-fold by 2080, with sea-level rise contributing the most. Moreover, 15 countries account for 90 % of this increase; that adaptation shows high potential to cost-effectively reduce flood risk. The results will be integrated into the Aqueduct Global Flood Analyzer web tool.