Input, storage and distribution of large woody debris along a mountain river continuum, the Drôme River, France

Piégay, Hervé; Thevenet, A; Citterio, A.

doi:10.1016/s0341-8162(98)00120-9

Cited by 105 publications

(79 citation statements)

References 31 publications

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“…This potential for unmanaged rivers bordered by riparian woodland to retain large quantities of wood has been widely observed in the field (e.g. Piégay et al, 1999;Gurnell et al, 2000;Wyzga et al, 2005;Lassettre et al, 2008).…”

Section: Interactions Between Riparian Vegetation Wood and River Chamentioning

confidence: 96%

Physical modelling of the combined effect of vegetation and wood on river morphology

et al. 2015

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The research reported in this paper employs flume experiments to investigate the potential effects of living vegetation and large wood on river morphology, specifically aiming to explore how different wood input and vegetation scenarios impact channel patterns and dynamics.We used a mobile bed laboratory flume, divided into three parallel channels (1.7 m wide, 10 m long) filled with uniform sand to reproduce braided networks subject to a series of cycles of flooding, wood input, and vegetation growth. Temporal evolution of river configuration (in terms of the braiding index), vegetation establishment and erosion, and wood deposition amount and pattern was recorded in a series of vertical images. The experiments reproduced many forms and processes that have been observed in the field, from scattered logs in unvegetated, dynamic braided channels, to large wood jams associated with river bars and bends in vegetated, stable, single thread rivers. Results showed that the inclusion of vegetation in the experiments changes wood dynamics, in terms of both the quantity that is stored and the depositional patterns that develop. Vegetated banks increased channel stability, reducing lateral erosion and the number of active channels. This promoted the formation of stable wood jams, where logs accumulated continuously at the same locations during subsequent floods, reinforcing their effect on river morphology. The feasibility of studying these processes in a controlled environment opens new possibilities for disentangling the complex linkages in the biogeomorphological evolution of the fluvial system and thus for promoting improved scientific understanding.

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Section: Interactions Between Riparian Vegetation Wood and River Chamentioning

confidence: 96%

Physical modelling of the combined effect of vegetation and wood on river morphology

et al. 2015

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“…In western Europe, intense management of the riparian zone, flow regulation, channelization, and channel cleaning have, for hundreds of years in some cases, constrained the influence of LWD on ecosystem function in large meandering rivers (Petts, 1989;Piégay and Gurnell, 1997). Many floodplain rivers in France have young riparian forests of small trees (Piégay, 1993;Piégay et al, 1999). Even compared to the regulated upper Missouri, inputs of massive, snag-caliber LWD are apparently rare in western European rivers; most wood that falls into the river is deposited downriver on bars or on the floodplain, rather than retained as snags in the channel (Piégay and Gurnell, 1997).…”

Section: Lwd In Floodplain Riversmentioning

confidence: 99%

Bank stabilization, riparian land use and the distribution of large woody debris in a regulated reach of the upper Missouri River, North Dakota, USA

Angradi

Schweiger

Bolgrien

et al. 2004

River Research & Apps

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Large woody debris (LWD) is an important component of ecosystem structure and function in large floodplain rivers. We examined associations between LWD distribution and riparian land use, bank stabilization (e.g. riprap revetment), local channel geomorphology, and distance downriver from the dam in the Garrison Reach, a regulated reach of the upper Missouri River in North Dakota, USA. We conducted a survey of shoreline-associated LWD in the reach during typical summer flow conditions. Reachwide LWD density was 21.3 pieces km À1 of shoreline, of which most pieces (39%) were 'beached' between the waterline and the bankfull level, 31% of pieces had evidence of originating at their current location (anchored), 18% of pieces were in deep water (>1 m), and 13% were in shallow water. LWD density along unstabilized alluvial (sand/silt) shorelines (27.3 pieces km À1) was much higher than along stabilized shorelines (7.2 pieces km ). Bank stabilization nearly eliminated the positive effect of riparian forest on LWD density. A predicted longitudinal increase in LWD density with distance from the dam was detected only for deep LWD (including snags) along unstabilized alluvial shorelines. Partial resurvey in the summer following the initial survey revealed a reduction in total LWD density in the reach that we attribute to an increase in summer flow between years. Changes in riparian management and land use could slow the loss of LWD-related ecosystem services. However, restoration of a natural LWD regime in the Missouri River would require naturalization of the hydrograph and modification of existing bank stabilization and channel engineering structures.

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“…Moreover, if wood is transported massively during highmagnitude flood events, it could represent a risk for sensitive structures such as bridge piers (Mazzorana et al, 2009;Rigon et al, 2012). Given the important positive and potentially very negative effects of wood in rivers, increasing attention has been given to the assessment of wood budget at the catchment and reach scales (Sedell and Froggatt, 1984;Palik et al, 1998;Piégay et al, 1999;Marcus et al, 2011;Schenk et al, 2013). Recently, Marcus et al (2011) attempted to calculate an annual wood budget using a relation between the wood transport rate and the flow discharge.…”

Section: Introductionmentioning

confidence: 99%

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

Ravazzolo¹,

Mao²,

Picco³

et al. 2015

Geomorphology

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Large pieces of in-channel wood can exert an important role on the ecological and morphological properties of gravel-bed rivers. On the other side, when transported during flood events, large wood can become a source of risk for sensitive structures such as bridges. However, wood displacement and velocity in river systems are still poorly understood, especially in large gravel-bed rivers. This study focuses on log transport in a valley reach of Tagliamento River (Italy). Log displacement during flood events of different magnitude recorded from June 2010 to October 2011 have been analysed thanks to the installation of 113 radio frequency identification (RFID) tags and 42 GPS tracker devices in logs of different dimensions. Recovery rate of logs equipped with RFID and GPS trackers was about 43% and 42%, respectively. The GPS devices allowed us to analyse in details the log displacement and transport overtime, indicating a higher log entrainment during rising limb of hydrographs. The threshold for the entrainment of logs from low bars is around 40% of bankfull water stage. No clear relationship was found between the peak of flood and log displacement length and velocity. However, log displacement length and velocity appears significantly correlated to the ratio between the peak of flow and the water stage exceeding the flow duration curve for 25% of *Revised manuscript with no changes marked Click here to view linked References

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Input, storage and distribution of large woody debris along a mountain river continuum, the Drôme River, France

Cited by 105 publications

References 31 publications

Physical modelling of the combined effect of vegetation and wood on river morphology

Physical modelling of the combined effect of vegetation and wood on river morphology

Bank stabilization, riparian land use and the distribution of large woody debris in a regulated reach of the upper Missouri River, North Dakota, USA

Tracking log displacement during floods in the Tagliamento River using RFID and GPS tracker devices

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