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How do large wildfires impact sediment redistribution over multiple decades?

2022-07Artigo científico Acesso aberto
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dc.contributor.authorFollmi, Dante
dc.contributor.authorBaartman, Jantiene
dc.contributor.authorBenali, Akli
dc.contributor.authorNunes, João Pedro
dc.date.accessioned2022-09-06T12:21:03Z
dc.date.available2022-09-06T12:21:03Z
dc.date.issued2022-07
dc.description.abstractWildfires have become an increasing threat for Mediterranean ecosystems, due to increasing climate change-induced wildfire activity and changing land management practices. In addition to the initial risk, wildfires can alter the soil in various ways—depending on fire severity—and cause enhanced post-fire erosion. Usually, post-fire erosion studies focus on a short time window and lack the attention for sediment dynamics at larger spatial scales. Yet, these large spatial and temporal scales are fundamental for a better understanding of long-term destructive effects of multiple recurring wildfires on post-fire erosion processes and catchment sediment dynamics. In this study the landscape evolution model LAPSUS was used to simulate erosion and deposition in the 404 km2 Águeda catchment in north-central Portugal over a 41-year (1979–2020) timespan, including eight wildfires each burning >1000 ha. To include variation in fire severity and its impact on the soil, four burn severity classes, represented by the difference normalized burn ratio (dNBR), were parameterized. Although model calibration was difficult due to lack of spatial and temporal measured data, the results show that long-term post-fire net erosion rates were significantly higher in the wildfire scenarios (5.95 ton ha−1 yr−1) compared to those of a non-wildfire scenario (0.58 ton ha−1 yr−1). Furthermore, erosion values increased with burn severity and multiple wildfires increased the overall catchment sediment build-up. Simulated erosion patterns showed great spatial variability, with large deposition and erosion rates inside streams. This variability made it difficult to identify land uses that were most sensitive for post-fire erosion, because some land uses were located in more erosion-sensitive areas (e.g. streams, gullies) or were more affected by high burn severity levels than others. Despite these limitations, LAPSUS performed well on addressing spatial sediment processes and can contribute to pre-fire management strategies, by identifying locations at risk of post-fire erosion.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1002/esp.5441pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/54337
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWileypt_PT
dc.relationFRISCO: managing Fire-induced RISks of water quality Contamination
dc.relationCentre for Ecology, Evolution and Environmental Changes
dc.relationSCONEFIRE: Stream Contamination by Forest Fires – pathways, impacts on water resources, and future vulnerability
dc.relationNot Available
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.titleHow do large wildfires impact sediment redistribution over multiple decades?pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleFRISCO: managing Fire-induced RISks of water quality Contamination
oaire.awardTitleCentre for Ecology, Evolution and Environmental Changes
oaire.awardTitleSCONEFIRE: Stream Contamination by Forest Fires – pathways, impacts on water resources, and future vulnerability
oaire.awardTitleNot Available
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PCIF%2FMPG%2F0044%2F2018/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00329%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Investigador FCT/IF%2F00586%2F2015%2FCP1276%2FCT0016/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/CEEC IND 2018/CEECIND%2F03799%2F2018%2FCP1563%2FCT0003/PT
oaire.citation.titleEarth Surface Processes and Landformspt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamInvestigador FCT
oaire.fundingStreamCEEC IND 2018
person.familyNameCarvalho Nunes
person.givenNameJoão Pedro
person.identifierA-5497-2011
person.identifier.ciencia-id2911-5CBD-5FA9
person.identifier.orcid0000-0002-0164-249X
person.identifier.scopus-author-id7102878032
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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