Wood dispersal in braided streams: Results from physical modeling

Welber, Matilde; Bertoldi, Walter; Tubino, Marco

doi:10.1002/2013wr014046

Cited by 60 publications

(60 citation statements)

References 60 publications

(134 reference statements)

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“…This is also confirmed by other analyses conducted in this study. In fact, contrary to what was reported by Welber et al (2013) and Ruiz-Villanueva et al (2015), in this case there are no significant correlations between LW displacement and its diameter. Instead, the lack of statistical significance in the relationship between traveled distance and LW length agrees with Ruiz-Villanueva et al (2015).…”

Section: Discussioncontrasting

confidence: 99%

Bank erosion and large wood recruitment along a gravel bed river

Picco

Tonon

Rainato

et al. 2016

J Agricult Engineer

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Riverine environments can be very dynamic and complex systems, particularly because of the interaction between active channel and riparian land during flood events of different magnitude. In recent years increasing attention has been paid to large wood (LW), focusing on its role and impact along riverine systems and fluvial landscapes. This research aims to analyze the characteristics of LW recruitment as a consequence of a flood event along a reach of a gravel-bed river. The study was conducted on a 3 km-long reach located in the middle course of the Piave River (north-eastern Italian Alps). A 20 m-wide buffer zone was considered along the floodplains and islands. Every standing tree in this buffer with diameter ≥0.10 m was measured manually (diameter breast height; height), whereas shrubs were not considered. The most common species in the study area are: Populus sp., Salix sp., Alnus sp., Carpinus sp., Fraxinus sp., Pinus sylvestris and Robinia pseudoacacia. An over bankfull flood (Q=1329 m 3 s -1 ; recurrence interval=6 years) in November 2014 caused erosions along the floodplain (15,565.5 m 2 ), pioneer islands (25.2 m 2 ) and building islands (2085.6 m 2 ), recruiting 690 trees. Four of these trees were recruited from the pioneer islands (0.16 tree m -2 ), 79 from building islands (0.04 tree m -2 ) and 607 from floodplains (0.04 tree m -2 ). Accurate dendrometric measurements were used to define the input volume of LW from the floodplains (86.25 m 3 ), pioneer islands (0.14 m 3 ) and building islands (6.62 m 3 ). The maximum distance traveled by LW recruited from the floodplain, pioneer and building islands was 8927, 1021 and 3727 m, respectively. Statistical analysis showed no significant relationship between the displacement and LW characteristics considered (diameter, length, volume, density). These results demonstrate that the recruitment and subsequent transport of LW is a complex mechanism that requires further study. To better characterize these mechanisms, it appears clear that it is important to consider not only the LW characteristics but also the connection between LW, morphological settings, and flood event characteristics.

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Section: Discussioncontrasting

confidence: 99%

Bank erosion and large wood recruitment along a gravel bed river

Picco

Tonon

Rainato

et al. 2016

J Agricult Engineer

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“…Additionally, field observations suggest that relatively small and loose wood pieces are easier to move than buried logs and/or pieces that are longer than the bankfull width (Gurnell, 2013). Moreover, mobile small pieces of wood have been observed as being trapped by large wood pieces (Seo and Nakamura, 2009;Welber et al, 2013).…”

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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“…Large (dead) wood has also been studied in the laboratory, mostly to investigate its effect on the flow field and to assess the conditions under which wood can be mobilized and transported (Braudrick et al, 1997;Braudrick and Grant, 2001;Bocchiola et al, 2006;Welber et al, 2013). The interaction between wood and bridges during floods has also been investigated (Schmocker and Weitbrecht, 2013).…”

Section: Introductionmentioning

confidence: 99%

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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Wood dispersal in braided streams: Results from physical modeling

Cited by 60 publications

References 60 publications

Bank erosion and large wood recruitment along a gravel bed river

Bank erosion and large wood recruitment along a gravel bed river

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

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

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