A high‐resolution inter‐annual framework for exploring hydrological drivers of large wood dynamics

River Research and Applications, Journal Year: 2024, Volume and Issue: 40(6), P. 958 - 975

Published: Jan. 22, 2024

Abstract Rivers with alluvial bars store more wood than those without, supplied through channel shifting. However, dynamics (arrival or new deposits, departure entrainment, and stable immobile pieces) can vary substantially over time in response to critical hydrological drivers that are largely unknown. To evaluate them, we studied the of large pieces logjams along a 12‐km reach lower Allier River using six series aerial images variable resolution acquired between 2009 2020, during which maximum river discharge fluctuated around dominant flood (Q 1.5 ) is potentially bankfull this well‐preserved not incised reach. Individual was best correlated water levels exceeding discharge. The duration highest magnitude depositions, shorter floods resulting higher number deposits. Finally, most remained when did exceed 60% Q long period time. Changes inter‐annual budget (reach‐scale) depend on exceeded . Hydrological conditions driving jam build‐up removal were similar controlling individual piece dynamics. results suggest specific influence log jams River. Understanding its impact morphology fundamental for successful management habitat restoration initiatives.

Language: Английский

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A review of large wood dynamics relevant to hazard characteristics for built structures

Geomorphology, Journal Year: 2024, Volume and Issue: 453, P. 109152 - 109152

Published: March 13, 2024

Language: Английский

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Using Structure from Motion photogrammetry to assess large wood (LW) accumulations in the field

Geomorphology, Journal Year: 2019, Volume and Issue: 346, P. 106851 - 106851

Published: Aug. 26, 2019

Language: Английский

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Functional Design of Mitigation Measures: From Design Event Definition to Targeted Process Modifications

Springer eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 495 - 538

Published: Jan. 1, 2024

Language: Английский

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Wood process domains and wood loads on floodplains

Earth Surface Processes and Landforms, Journal Year: 2019, Volume and Issue: 45(1), P. 144 - 156

Published: Dec. 15, 2019

Abstract Downed large wood on floodplains creates similar geomorphic and ecological effects as in the active channel, but has been subject of fewer studies. I propose floodplain process domains that are distinguished based recruitment source at reach to river‐length scale. Wood recruited can be autochthonous (individual or mass from forest), fluvially transported, transported adjacent hillslopes via movements come down valley side slopes main channel. Fluvially further being deposited: within channel subsequently accreted floodplain; marginal channel; during overbank flow; tributary fans. The mechanism a influences spatial distribution across proportion pieces jams, which turn wood. Using published studies load for unmanaged river corridors, hypothesize climate‐controlled balance between forest primary productivity decay rates downed is first‐order control loads. Disturbance regime second‐order controls Understanding applied quantifying effect corridors; restoration; paleoenvironmental inferences; estimation organic carbon stock corridors. © 2019 John Wiley & Sons, Ltd.

Language: Английский

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Anticipating cascading effects of extreme precipitation with pathway schemes - Three case studies from Europe

Environment International, Journal Year: 2019, Volume and Issue: 127, P. 291 - 304

Published: April 2, 2019

Extreme precipitation events with high local intensities, heavy snowfall or extensive freezing rain can have devastating impacts on society and economy. Not only is the quantitative forecast of such sometimes difficult associated large uncertainties, also are potential consequences highly complex challenging to predict. It thus a demanding task anticipate nowcast extreme precipitation, even more so in situations where human lives critical infrastructure might be at risk. In recent years, term "cascading effects" has been increasingly used describe which an initial trigger leads sequence significant magnitude. We here analyze three examples for different types triggering event generated cascade impacts, namely convective Swiss Prealps, Slovenia, episode Catalonia. With aim improve process understanding precipitation-triggered events, we assess prediction selected cascading effects that caused diverse impacts. To this end, use framework should ultimately allow development better design risk assessment management strategies. Our findings confirm damage clearly related knowledge effects. Major challenges predicting complexity, interdependencies increasing uncertainty along cascade. propose including two approaches: (i) one during past then serves as basis (ii) generalized approach increase preparedness level operational services before future precipitation. Both approaches based pathway schemes addition numerical models hazard maps predict effects, but training tools.

Language: Английский

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Porosity and volume assessments of large wood (LW) accumulations

Geomorphology, Journal Year: 2020, Volume and Issue: 358, P. 107122 - 107122

Published: Feb. 26, 2020

Language: Английский

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Efficient Design of Road Drainage Systems

Water, Journal Year: 2021, Volume and Issue: 13(12), P. 1661 - 1661

Published: June 14, 2021

Excess surface water on roadways due to storm events can cause hazardous scenarios for traffic. The design of efficient road and transportation facility drainage systems is a major challenge. Different approaches limit excess be found in the standards different countries. This document presents method based hydraulic numerical simulation assessment grate inlet efficiency using Iber model. suitable application criteria according regulations presented facilitates sensitivity analyses performance scupper dispositions through total control behavior each inlets considered scenario. detailed information basis solution comparisons make better decisions obtain solutions that maximize efficiency.

Language: Английский

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Landslide-channel feedbacks amplify channel widening during floods

npj natural hazards., Journal Year: 2025, Volume and Issue: 2(1)

Published: Jan. 24, 2025

Language: Английский

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Automatic detection of floating instream large wood in videos using deep learning

Earth Surface Dynamics, Journal Year: 2025, Volume and Issue: 13(1), P. 167 - 189

Published: Feb. 7, 2025

Abstract. Instream large wood (i.e. downed trees, branches, and roots larger than 1m in length 10 cm diameter) performs essential geomorphological ecological functions that support the health of river ecosystems. However, even though its transport during floods may pose risks, it is rarely observed remains poorly understood. This paper presents a novel approach for detecting floating pieces instream videos. The uses convolutional neural network to automatically detect wood. We sampled data represent different conditions, combining 20 datasets yield thousands images. designed multiple scenarios using subsets with without augmentation. analysed contribution each scenario effectiveness model k-fold cross-validation. mean average precision varies between 35 % 93 influenced by quality detects. When 418-pixel input image resolution, detects an overall 67 %. Improvements up 23 could be achieved some instances, increasing resolution raised weighted 74 demonstrate detection performance on specific dataset not solely determined complexity or training data. Therefore, findings this used when designing custom network. With growing availability flood-related videos featuring uploaded internet, methodology facilitates quantification across wide variety sources.

Language: Английский

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