A two end-member model of wood dynamics in headwater neotropical rivers

Wohl, Ellen; Bolton, Susan; Cadol, Daniel; Comiti, Francesco; Goode, Jaime R.; Mao, Luca

doi:10.1016/j.jhydrol.2011.01.061

Cited by 29 publications

(33 citation statements)

References 79 publications

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“…More abundant research has developed since 2007 focusing mainly on LW morphologic and hydraulic roles (Andreoli et al, 2007;Comiti et al, 2008;Mao et al, 2008Mao et al, , 2013Cadol et al, 2009;Wohl et al, 2009Wohl et al, , 2012Cadol and Wohl, 2010;Iroumé at al., 2010Iroumé at al., , 2011Iroumé at al., , 2014Ulloa et al, 2011) and also on the ecology of low-order mountain channels (Vera et al, 2014). First analyses of LW mobilization in Latin American streams are the reports by Andreoli et al (2008), Mao et al (2008), andIroumé et al (2011).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Large wood elements are more stable in first-order streams and are mobilized only during episodic extreme events (Bilby and Ward, 1989;Robison and Beschta, 1990;Gurnell, 2003;Swanson, 2003), but as stream size and depth increase, hydraulic processes dominate and LW is less stable (Keller and Swanson, 1979;Harmon et al, 1986;Abbe and Montgomery, 2003;Gurnell, 2003). The magnitude and sequence of a series of flows are key factors for LW movement (Haga et al, 2002;Wohl and Goode, 2008) and for rapid increases of the hydrostatic forces of buoyancy and lift and the hydrodynamic force of drag facilitate transport of instream wood (Wohl et al, 2012). The ratio of peak water level to log diameter exerts a great influence over LW mobility (Wohl and Goode, 2008), temporal variation of mobility rates are explained by variation in peak flows and peak unit stream power (Wohl and Goode, 2008;Cadol and Wohl, 2010), a flow magnitude greater than the previous flows is necessary to retransport most logs (Haga et al, 2002), and MacVicar et al…”

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confidence: 99%

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Large wood mobility processes in low-order Chilean river channels

et al. 2015

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Large wood (LW) mobility was studied over several time periods in channel segments of four low-order mountain streams, southern Chile. All wood pieces found within the bankfull channels and on the streambanks extending into the channel with dimensions more A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 than 10 cm in diameter and 1 m in length were measured and their position was referenced.Thirty six percent of measured wood pieces were tagged to investigate log mobility. All segments were first surveyed in summer and then after consecutive rainy winter periods.Annual LW mobility ranged between 0 and 28%. Eighty-four percent of the moved LW had diameters ≤ 40 cm and 92% had lengths ≤ 7 m. Large wood mobility was higher in periods when maximum water level (H max ) exceeded channel bankfull depth (H Bk ) than in periods with flows less than H Bk , but the difference was not statistically significant.Dimensions of moved LW showed no significant differences between periods with flows exceeding and with flows less than bankfull stage. Statistically significant relationships were found between annual LW mobility (%) and unit stream power (for H max ) andH max /H Bk . The mean diameter of transported wood pieces per period was significantly correlated with unit stream power for H 15% and H 50% (the level above which the flow remains for 15 and 50% of the time, respectively). These results contribute to an understanding of the complexity of LW mobilization processes in mountain streams and can be used to assess and prevent potential damage caused by LW mobilization during floods.

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Section: Accepted Manuscriptmentioning

confidence: 99%

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Large wood mobility processes in low-order Chilean river channels

et al. 2015

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“…In the tropics in the framework of the EU collaboration project 'EPIC FORCE' (Bathurst et al, 2010), a post-event survey was conducted in a small catchment of Costa Rica (Mao and Comiti, 2010; also briefly summarized in Wohl et al, 2012) where a bridge was reportedly destroyed by large trunks colliding against its structure during the 2005 flood event, which was roughly estimated to be in the order of 50 years recurrence interval. Also, large logjams piled up against the buildings within the small village lying on the river banks.…”

Section: Introductionmentioning

confidence: 99%

“…Also, large logjams piled up against the buildings within the small village lying on the river banks. Field observations and a conceptual model about wood transport dynamics in tropical basins are presented in Cadol et al (2010) and Wohl et al (2012), respectively.…”

Section: Introductionmentioning

confidence: 99%

Large wood recruitment and transport during large floods: A review

2016

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“…Despite the fact that logjams can have a dramatic impact on fluvial dynamics and fluvial-floodplain exchanges, their systematic study is relatively recent and has mostly been carried out in temperate zones (Dixon, 2016;Ruiz-Villanueva et al, 2016;Wohl, 2017Wohl, , 2013. Very few studies have looked at the wood-river interactions in the neotropics, and these have mostly focused on headwater rivers Wohl, 2011, 2010;Iroumé et al, 2015;Wohl et al, 2012). Wohl (2017) reports that no field-based studies of LW in Amazonian rivers has ever been published in the English-language literature.…”

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confidence: 99%

River logjams cause frequent large-scale forest die-off events in southwestern Amazonia

Lombardo

2017

Earth Syst. Dynam.

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Abstract. This paper investigates the dynamics of logjam-induced floods and alluvial deposition in the Bolivian Amazon and the effects these have on forest disturbance and recovery cycles. It expands on previous work by Gullison et al. (1996) who reported a case of catastrophic floods triggered by logjams in the Chimane Forest in the Bolivian Amazon. No further studies have followed up on this observation and no research has been published on the effects of large wood in tropical lowland rivers. The study is based on the analysis of a time series of Landsat imagery and field evidence. Results show that logjam-induced floods are a major driver of forest disturbance along the Andean piedmont in the Bolivian Amazon. New logjams form on an almost yearly basis, always further upriver, until an avulsion takes place. Logjam-induced floods are characterized here by the sudden deposition of a thick sand layer and the death of forest in a V-shaped area. The Bolivian Amazon offers a unique opportunity for further research on how large wood affects river behavior in lowland tropical settings and how large and frequent forest disturbance events resulting from river logjams affect forest biodiversity and community successions.

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A two end-member model of wood dynamics in headwater neotropical rivers

Cited by 29 publications

References 79 publications

Large wood mobility processes in low-order Chilean river channels

Large wood mobility processes in low-order Chilean river channels

Large wood recruitment and transport during large floods: A review

River logjams cause frequent large-scale forest die-off events in southwestern Amazonia

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