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dc.contributor.authorPhillips, J
dc.contributor.authorBarclay, J
dc.contributor.authorCole, P
dc.contributor.authorJohnson, M
dc.contributor.authorMiller, V
dc.contributor.authorRobertson, R
dc.date.accessioned2023-08-16T07:57:46Z
dc.date.available2023-08-16T07:57:46Z
dc.date.issued2024-04
dc.identifier.issn0305-8719
dc.identifier.issn2041-4927
dc.identifier.urihttps://pearl.plymouth.ac.uk/handle/10026.1/21233
dc.description.abstract

Lahars are energetic flows of loosely consolidated volcanic debris and water, which have occurred frequently after rainfall events on St Vincent in the Eastern Caribbean since the April 2021 explosive phase of the 2020-21 eruption of La Soufriere volcano. Using scientific observations and information from social media, we have constructed a detailed timeline of 25 lahar events that occurred during 2021, and summarised lahar impacts and losses. 20 mm daily rainfall on a river catchment is (and remains) sufficient to result in a lahar. We used this threshold, with field estimates of lahar volumes, to conduct both an island-wide assessment of potentially impacted locations using the LAHARZ model, and a detailed reconstruction of one lahar event, using the dynamic model LaharFlow. A simplified catchment hydrology approach with runoff ratios typical for the Caribbean showed good agreement with observations of flow properties near the coast. Lahars will continue to be an important hazard in St Vincent into the future, and our modelling approach can assess future lahar impacts and provide early warnings. Social media provided key information about lahars and impacts, and allowed communities to alert each other. Future hazard mitigation should strengthen links between communities and with national risk management.

dc.format.extent245-266
dc.languageen
dc.publisherGeological Society of London
dc.subject3707 Hydrology
dc.subject3709 Physical Geography and Environmental Geoscience
dc.subject3701 Atmospheric Sciences
dc.subject37 Earth Sciences
dc.titleImpacts and prospective hazard analysis of rainfall-triggered lahars on St. Vincent 2021–2022
dc.typejournal-article
plymouth.issue1
plymouth.volume539
plymouth.publisher-urlhttp://dx.doi.org/10.1144/sp539-2022-313
plymouth.publication-statusPublished
plymouth.journalGeological Society, London, Special Publications
dc.identifier.doi10.1144/sp539-2022-313
plymouth.organisational-group|Plymouth
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering|School of Geography, Earth and Environmental Sciences
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA
plymouth.organisational-group|Plymouth|Users by role
plymouth.organisational-group|Plymouth|Users by role|Academics
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA|UoA07 Earth Systems and Environmental Sciences
dcterms.dateAccepted2023-08-01
dc.date.updated2023-08-16T07:57:40Z
dc.rights.embargodate2023-8-17
dc.identifier.eissn2041-4927
dc.rights.embargoperiodforever
rioxxterms.versionofrecord10.1144/sp539-2022-313


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