the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 08 Oct 2024
Review article: Towards multi-hazard and multi-risk indicators – a review and recommendations for development and implementation
Abstract. Undertaking a natural hazard or risk assessment from a single hazard approach can be considered incomplete where the interactions between and impacts from multiple hazards and risks are not considered. However, the development of indicators in disaster risk management has only recently started to explicitly include multi-hazard and multi-risk approach. Indicators contain observable and measurable characteristics to simplify information to understand the state of a concept or phenomenon, and/or to monitor it over time. To date, there have been limited efforts to understand how indicators are being used in this context. Using a systematic review, 194 publications were identified that mention indicators, covering hazards, vulnerability, and risk/impact. We find that the majority of studies exploring indicators are multi-layer single hazards and risks; in other words, they did not include the interactions between hazards. The results also demonstrate a predominance of studies on hazard indicators (88 %) versus risk indicators, with a dominance of hydro-meteorological indicators. Only 20 % of the studies integrated hazard, vulnerability and risk/impact. Based on the findings, we propose 12 recommendations to enable the uptake of indicators, from advancing research into multi-hazard and multi-risk indicator frameworks, to enabling partnerships to ensure the inclusion of stakeholder needs in indicator development.
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RC1: 'Comment on nhess-2024-178', Anonymous Referee #1, 04 Nov 2024
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Dear Editor,
Thank you for giving me the opportunity to review the article “Review article: Towards multi-hazard and multi-risk indicators – a review and recommendations for development and implementation”. In the enclosed manuscript, the authors provide a systematic review of recent literature addressing the topic of multi-hazard and multi-risk indicators. The authors clearly identify gaps in the literature and propose a series of recommendations to advance the uptake of indicators in the field of multi-hazard and multi-risk.
General comment:
Authors have undertaken a rigorous literature review, bringing together 194 scientific articles addressing a broad range of natural hazards, methods, and disciplines. The objective of the article is to build on the body of literature to provide recommendations on the development of indicators for multi-hazard and multi-risk for disaster risk management and assessment. Objectives are clear and the article is well written. However, I think that the article misses its announced objectives in its current state. The main findings of the article are gaps in the literature. These gaps indeed exist and are well summarized in Section 4. I believe that there is content in the article, and in the literature reviewed, that could shape recommendations that are more impactful. In particular, I see room for improvements on three broad aspects:
- Disconnection between recommendations (Section 4.3) and results from the literature review:
Recommendations provided in Section 4.3 do not seem to build on the literature reviewed in their current state. The four recommendations on Advancing research into multi-hazard and multi-risk frameworks may result from the fact that only a minority of the reviewed articles address hazard interrelations and impacts. These recommendations are instead very generic, and some have already been made in previous articles (e.g., Ward et al., 2022, Zscheischler et al., 2020). The following eight recommendations also lack connections with results from the literature review.
- Lack of clarity on the content of the reviewed literature:
The methodology, key words and filters used to compile the 194 article is clearly explained in Section 2. However, some information about the nature of articles collected are not provided, resulting in a difficult interpretation of the result part for the reader. In particular, information about the number of hazards represented, preferably from each category used in the article (meteorological, geophysical …) would be beneficial. The number of hazards/interrelations considered would also help to understand the state-of-the art in multi-hazard indicators.
- Presentation of results:
The alternation of usage raw numbers and percentages in section 3 is confusing. The classification chosen for Figure 3, Table 2 and Table 3 is also confusing, as we are seeing percentages of percentages. The Sankey diagram of Figure 3 is hard to interpret and could be improved. Figure 4 is great. The classification made between compound hazard and cascading hazard indicators in Section 3.3 is also not ideal in my opinion.
Finally, I think that the article has the potential to provide more specific recommendations, building on some existing indicators/indexes (especially for multi-hazard indicators). I therefore suggest major revisions, focusing on Section 3 and Section 4.
Specific comments:
- Line 44-45 p1: “in other words, they did not include the interactions between hazards.” Hazard and also risks, no?
- Line 203 p10. This division of “multi-hazard” literature in two groups is relevant and has already been done before (e.g. Tilloy et al., 2019), but it is not obvious to me in the context of the article. Could the authors provide a rational for the division?
- Line 213-215 p11. It is not clear what is the “vulnerability and impact” category. Does that mean that 88% of all articles deal with hazards, 49% with vulnerability and 35% with impact?
- Figure 3 p11. The figure is confusing as groups for hazards are “yes” and “no” while they correspond to methods used for vulnerability and impact. Another figure showing how groups of literature overlap would be more informative and connected to the text.
- Table 3 p12. I do not understand why the “no” column only applies to hazard.
- Line 259 p13: “The majority of geohazards were associated with multi-layer single hazard interactions (77%)” If it is a multi-layer approach, there are no interactions.
- Line 261 p13. “When it came to multi-hazard interactions, geohazards were 261 almost equally distributed between compound (8%) and triggering and amplification interactions (12%).” That would be great to know which hazards are discussed here.
- Line 267 p14. “We found that approximately 44% of the 194 articles reviewed were categorised as multi-layer single hazard studies, predominantly focusing on meteorological, hydrological, and geo hazards (Fig. 4).” Figure 4 show hazard count and not paper count.
- Line 287-291 p14. The classification into five hazard groups mentioned implicitly takes into account hazard interrelations. For example: winter weather would include hazards such as extreme snowfall, avalanches, extreme cold, extreme wind… These hazards are interrelated (compound and triggering). Review the sentence accordingly.
- Line 341 p15. Same as comment h)
- Figure 5. Finally we see the hazards! Although I don’t understand how some hazards (e.g., Tsunamis) can be in both categories. The absence of scale make the figure prettier but less interpretable.
- Line 374 p17. Drought is also a hydrometeorological hazard, it does not make much sense to separate in from flood here.
- General p17. The separation of indication for compound and triggering interrelations is not very convincing in this context.
- Line 388 p17. Same as comment h)
- Line 484 p22. This first recommendation was already made in Kappes et al. (2012) more than a decade ago.
- Line 487-491 p22. Why “interrelationship” is suddenly being used in these lines (more occurrences here than in the previous 21 pages) ?
- Line 502 p22. You mean Section 4.2?
- Line 586 p24. This is not new. It is even a requirement for EU funded projects.
- Line 588 p24. Be aware that similar tools already exist. Examples: https://drmkc.jrc.ec.europa.eu/risk-data-hub#/atlas; https://climate-conflict.org/www/index/methodology
- General conclusion: Please state that you identified gaps in the literature
- Line 618-620 p25. It is not clear for me that recommendations are based on the literature review.
I look forward to reading a revised version if asked to by the editor
References:
Tilloy, A., Malamud, B. D., Winter, H., & Joly-Laugel, A. (2019). A review of quantification methodologies for multi-hazard interrelationships. Earth-Science Reviews, 196, 102881.
Ward, P. J. et al. Invited perspectives: A research agenda towards disaster risk management pathways in multi-(hazard-)risk assessment. Nat. Hazard. Earth Syst. Sci. 22, 1487–1497 (2022).
Zscheischler, J., Martius, O., Westra, S. et al. A typology of compound weather and climate events. Nat Rev Earth Environ 1, 333–347 (2020). https://doi.org/10.1038/s43017-020-0060-z
Citation: https://doi.org/10.5194/nhess-2024-178-RC1
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