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Using tree-rings to determine large wood residence time and transport pulses in a gravel-bed river

Boivin Maxime, Buffin-Bélanger Thomas et Arseneault Dominique. (2018). Using tree-rings to determine large wood residence time and transport pulses in a gravel-bed river. E3S Web Conferences, 40, 02008.

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URL officielle: http://dx.doi.org/doi:10.1051/e3sconf/20184002008

Résumé

The Saint-Jean River (SRJ) in Eastern Canada is prone to the formation of very large rafts of wood. Managers of the SJR suspected these jams to influence salmon migration and carried out a dismantling operation to remove large wood accumulated in a 1.2 km long wood raft. This operation became a great opportunity to address key issues relating to large wood dynamics in a fluvial system: residence time and flood contribution to wood recruitment and transport. During the dismantling, we systematically sampled 319 trees from which year of death could be estimated from dendrochronology and year of accumulation in the raft could be obtained from satellite and aerial photos. These two dates allowed us to quantify the residence time for 262 datable large wood (LW) within the fluvial system, to examine the peak years of LW recruitment and to correlate the raft growth rate with hydrometeorological conditions since 1993. The results also emphasized four types of LW flood related to wood dynamics: 1) an erosive flood that produces a large amount of wood in river, 2) a mobilizing flood that carries large quantities of wood, 3) a flood mix that both recruits and transports large quantities of wood, and 4) an ice-breakup flood.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:40
Pages:02008
Version évaluée par les pairs:Oui
Date:5 Septembre 2018
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences humaines > Module des sciences humaines
Informations complémentaires:Communication présentée au River Flow 2018 - Ninth International Conference on Fluvial Hydraulics, Lyon-Villeurbanne, France
Déposé le:16 mars 2021 22:59
Dernière modification:16 mars 2021 22:59
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