Large wood recruitment and transport during large floods: A review

Comiti, Francesco; Lucía, Ana; Rickenmann, Dieter

doi:10.1016/j.geomorph.2016.06.016

Cited by 163 publications

(131 citation statements)

References 94 publications

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“…The majority of LW was in the downstream river segment in diffuse jams ( Figure 6 and Table II) indicating that most of the wood passes through the reach until it enters a lower energy system at the interface of the river and Lake Oahe. Comiti et al, 2016) and is likely due to the long duration of this dam regulated flood. The difference in results is likely due to the highly braided and complex channel of the Saint-Jean River compared to the relatively simple channel form of the Missouri River.…”

Section: Discussionmentioning

confidence: 97%

“…A comparison of change in large wood (LW), bank migration, and forest loss due to the 2011 flood displayed by river segments determined by the post-flood LW longitudinal statistical breaks. The majority of LW transport studies have been conducted on streams with a maximum discharge under 100 m 3 /s during the study period (Comiti et al, 2016;Ruiz-Villanueva et al, 2016a). Note that the relative distribution of forest loss is different than in Figure 8, this is due to the use of a different river segmentation.…”

Section: Discussionmentioning

confidence: 99%

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Large wood distribution, mobility, and recruitment in an inter‐dam river reach: A comparison with geomorphic process on the Garrison Reach of the Missouri River pre and post the historical 2011 flood

Schenk

Benthem

Dixon

et al. 2018

Earth Surf Processes Landf

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This study assessed the effect of the largest flood since dam regulation on geomorphic and large wood (LW) trends using LW distributions at three time periods on the 150 km long Garrison Reach of the Missouri River. In 2011, a flood exceeded 4390 m3/s for a two‐week period (705% above mean flow; 500 year flood). LW was measured using high resolution satellite imagery in summer 2010 and 2012. Ancillary data including forest character, vegetation cover, lateral bank retreat, and channel capacity. Lateral bank erosion removed approximately 7400 standing trees during the flood. Other mechanisms, that could account for the other two‐thirds of the measured in‐channel LW, include overland flow through floodplains and islands. LW transport was commonly near or over 100 km as indicated by longitudinal forest and bank loss and post‐flood LW distribution. LW concentrations shift at several locations along the river, both pre‐ and post‐flood, and correspond to geomorphic river regions created by the interaction of the Garrison Dam upstream and the Oahe Dam downstream. Areas near the upstream dam experienced proportionally higher rates of bank erosion and forest loss but in‐channel LW decreased, likely due to scouring. A large amount of LW moved during this flood, the chief anchoring mechanism was not bridges or narrow channel reaches but the channel complexity of the river delta created by the downstream reservoir. Areas near the downstream dam experienced bank accretion and large amounts of LW deposition. This study confirms the results of similar work in the Reach: despite a historic flood longitudinal LW and channel trends remain the same. Dam regulation has created a geomorphic and LW pattern that is largely uninterrupted by an unprecedented dam regulation era flood. River managers may require other tools than infrequent high intensity floods to restore geomorphic and LW patterns. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Large wood distribution, mobility, and recruitment in an inter‐dam river reach: A comparison with geomorphic process on the Garrison Reach of the Missouri River pre and post the historical 2011 flood

Schenk

Benthem

Dixon

et al. 2018

Earth Surf Processes Landf

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“…Mountain areas are characterised by complex geological and geomorphological settings and often display high hillslope‐channel connectivity (Harvey, ; Cavalli et al ., ; Bracken et al ., ), resulting in very high flood hazard due to a rapid hydrological response associated to instability phenomena on hillslopes, intense sediment transport, and important morphological changes in the channel network (Borga et al ., ; Comiti et al ., a; Surian et al ., ). In forested mountain areas, the transport of large quantities of wood material, hereafter referred to as large wood (LW), can be an exacerbating hazard factor (Diehl, ; Comiti et al ., ; Schmocker and Hager, ; Mazzorana et al ., ; Mao et al ., ; Ruiz‐Villanueva et al ., ; Gschnitzer et al ., ).…”

Section: Introductionmentioning

confidence: 98%

“…Great attention in the literature was deserved to in‐channel LW storage and its physical and morphological effects (see for a summary Gurnell et al ., ; Gurnell, ; Le Lay et al ., ; Ruiz‐Villanueva et al ., ; Wohl, ). However, our current knowledge of wood transport during floods is still very scarce (Comiti et al ., a). In this context, it is worth highlighting the added value of documenting extreme flood events deserving particular attention to assess recruited, transported, and deposited LW volumes and inferring the event‐related LW dynamics (Badoux et al ., , ; Rickenmann et al ., ; Lucía et al .…”

Section: Introductionmentioning

confidence: 99%

Assessing and mitigating large wood‐related hazards in mountain streams: recent approaches

Mazzorana

Ruíz-Villanueva

Marchi

et al. 2017

J Flood Risk Management

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The assessment and mitigation of floods in mountain streams, when large wood (LW) is transported, pose several challenges. The process chain consisting of flood propagation, LW recruitment, entrainment, transport, and entrapment triggers, at critical sections such as bridges, unexpected and exacerbated impacts to the exposed built environment. We provide a review on the recent advances in modelling LW dynamics during extreme river floods through computational approaches. Moreover, we describe how scaled flume experiments can enhance process understanding at critical flow sections such as bridges to address risk mitigation problems. Additionally, we present a framework based on Formative Scenario Analysis (FSA) to allow for expert knowledge integration and to subsequently derive consistent hazard process scenarios in steep mountain streams where the application of computational approaches is less reliable. Finally, we discuss how the application of the presented set of assessment methods can support integral flood risk management by explicitly considering LW dynamics since the effectiveness of mitigation critically depends on the acquired process understanding.

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“…Although empirical formulas have been developed to estimate the potential volume of wood transported during floods (e.g. Rickenmann,1997;Comiti et al, 2016), these are heavily dependent on wood supply conditions and of little predictive power, mainly due to the lack of field data. Indeed, field observations of largewood dynamics during floods are scarce.…”

Section: Introductionmentioning

confidence: 99%

Brief communication: The curious case of the large wood-laden flow event in the Pocuro stream (Chile)

Ravazzolo

Mao

Mazzorana

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Large wood transported during extreme flood events can represent a relevant additional source of hazards that should be taken into account in mountain environments. However, direct observations and monitoring of large-wood transport during floods are difficult and scarce. Here we present a video of a flood characterised by multiple phases of large-wood transport, including an initial phase of wood-laden flow rarely described in the literature. Estimations of flow velocity and transported wood volume provide a good opportunity to develop models of large-woodcongested transport.

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Large wood recruitment and transport during large floods: A review

Cited by 163 publications

References 94 publications

Large wood distribution, mobility, and recruitment in an inter‐dam river reach: A comparison with geomorphic process on the Garrison Reach of the Missouri River pre and post the historical 2011 flood

Large wood distribution, mobility, and recruitment in an inter‐dam river reach: A comparison with geomorphic process on the Garrison Reach of the Missouri River pre and post the historical 2011 flood

Assessing and mitigating large wood‐related hazards in mountain streams: recent approaches

Brief communication: The curious case of the large wood-laden flow event in the Pocuro stream (Chile)

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