the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The vulnerability of buildings to a large-scale debris flow and outburst flood hazard chain that occurred on 30 August 2020 in Ganluo, Southwest China
Shuang Liu
Nan Ning
Xiaopeng Zhang
Qiyuan Zhang
Md Abdur Rahim
Abstract. In mountainous areas, damage caused by debris flows is often aggravated by subsequent dam-burst floods within the main river confluence zone. On 30 August 2020, a catastrophic disaster chain occurred at the confluence of the Heixiluo Gully and Niri River in Ganluo County, Southwest China, that consisted of a debris flow, the formation of a barrier lake and subsequent dam breach that flooded the community. This study provides a comprehensive analysis of the damage to buildings resulting from the sequential occurrence of debris flow and dam-burst flood. The peak discharge of the debris flow in the gully mouth reached 1937 m3/s, and the change in the main river channel resulting from the dam-burst flood, which had a peak discharge of 2273 m3/s, resulted in a fourfold increase in the extent of flood inundation compared to an ordinary flood. Three hazard zones were established based on the building damage patterns: (I) primary debris flow burial; (II) secondary dam-burst flood inundation and (III) sequential debris flow burial and dam-burst inundation. Vulnerability curves were developed for Zone (II) and Zone (III) using impact pressures and inundation depths, and a vulnerability assessment chart is presented that contains the three damage categories. This research addresses a gap in the vulnerability assessments of debris flow hazard chains and can support in future disaster mitigation within confluence areas.
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Li Wei et al.
Status: open (until 27 Oct 2023)
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RC1: 'Comment on nhess-2023-75', Anonymous Referee #1, 21 Aug 2023
reply
Dear editor, dear authors,
I read with interest the pre-print of your paper about the vulnerability of buildings within a multi-hazard chain (debris flow - dam breach).
Principally, the idea of this manuscript is certainly interesting as, ... as you say, lots has been written about the hazard chain,
less about the vulnerability of exposed elements.
However, it first seemed strange to me that before getting a complete overview of the situation you present schemes,
which are typically a produc of interpretation .. and should only presented after investigation results.
Also the presentation of the maps in general, also those including flood simulation results are not very clear - so, some
more work is necessary to communicate your results to others.
Then, it is a multi-hazard situation and you (if I understood well) made only simulations of the final flood event, neglecting the
debris flow part. So, you cannot really say that you analysed the full chain as you consider the first part as known and set as a basis.
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Therefore, right from the beginning you should indicate that the core analysis is focused on the final part of the chain,
taking the first part as a given element.
This will require a restructuring of the paper and thus a major revision (see also comment about hazard chain schemes).
Â
Sincerely yours
Reviewer H
Citation: https://doi.org/10.5194/nhess-2023-75-RC1
Li Wei et al.
Li Wei et al.
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