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L-moments Reveal the Scales of Momentum Transport in Dense Canopy Flows

dc.contributor.authorChowdhuri, Subharthi
dc.contributor.authorPeltola, Olli
dc.contributor.departmentid4100311110
dc.contributor.departmentid4100411710
dc.contributor.orcidhttps://orcid.org/0000-0002-5518-7701
dc.contributor.orcidhttps://orcid.org/0000-0002-1744-6290
dc.contributor.organizationLuonnonvarakeskus
dc.date.accessioned2025-07-28T12:03:54Z
dc.date.issued2025
dc.description.abstractThe interaction between a dense forest canopy and atmosphere is a complex fluid-dynamical problem with a wide range of practical applications, spanning from the aspects of carbon sequestration to the spread of wildfires through a forest. To delineate the eddy processes specific to canopy flows, we develop an L-moment based event framework and apply it on a suite of observational datasets encompassing both canopy and atmospheric surface layer flows. In this framework, the turbulent fluctuations are considered as a chronicle of positive and negative events having finite lengths or time scales, whose statistical distributions are quantified through the L moments. L moments are statistically more robust than the conventional moments and have earlier been used in hydrology applications, but here we show how this concept is useful to identify the contrasting features between canopy and atmospheric surface layer flows. The L-moment framework is complemented with wavelet analysis, revealing how differently the canopy-scale coherent structures modulate the horizontal and vertical velocity components in sub-canopy environments. We hypothesize that a consequence of this phenomenon is the existence of two different eddy processes with distinct scaling properties that transport momentum in the gradient and counter-gradient directions, respectively. These findings shed light on a long-standing issue in canopy flows: why the integral timescale of vertical velocity increases as the heights approach the forest floor?
dc.format.pagerange24 p.
dc.identifier.citationHow to cite: Chowdhuri, S., Peltola, O. L-moments Reveal the Scales of Momentum Transport in Dense Canopy Flows. Boundary-Layer Meteorol 191, 17 (2025). https://doi.org/10.1007/s10546-025-00908-x
dc.identifier.urihttps://jukuri.luke.fi/handle/11111/99766
dc.identifier.urlhttps://doi.org/10.1007/s10546-025-00908-x
dc.identifier.urnURN:NBN:fi-fe2025072879698
dc.language.isoen
dc.okm.avoinsaatavuuskytkin1 = Avoimesti saatavilla
dc.okm.corporatecopublicationei
dc.okm.discipline1172
dc.okm.discipline1171
dc.okm.discipline114
dc.okm.internationalcopublicationei
dc.okm.julkaisukanavaoa2 = Osittain avoimessa julkaisukanavassa ilmestynyt julkaisu
dc.okm.selfarchivedon
dc.publisherSpringer Nature
dc.relation.articlenumber17
dc.relation.doi10.1007/s10546-025-00908-x
dc.relation.ispartofseriesBoundary-layer meteorology
dc.relation.issn0006-8314
dc.relation.issn1573-1472
dc.relation.numberinseries3
dc.relation.volume191
dc.rightsCC BY 4.0
dc.source.justusid123499
dc.subjectcanopy flows
dc.subjectevent framework
dc.subjectL-moment
dc.subjectmomentum transport
dc.subjectwavelet analysis
dc.teh41007-00272001
dc.titleL-moments Reveal the Scales of Momentum Transport in Dense Canopy Flows
dc.typepublication
dc.type.okmfi=A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä|sv=A1 Originalartikel i en vetenskaplig tidskrift|en=A1 Journal article (refereed), original research|
dc.type.versionfi=Publisher's version|sv=Publisher's version|en=Publisher's version|

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