Impact of large wood on sediment (dis)connectivity in a meandering river

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F24%3AA25038F7" target="_blank" >RIV/61988987:17310/24:A25038F7 - isvavai.cz</a>

Result on the web

<a href="https://linkinghub.elsevier.com/retrieve/pii/S0169555X2400103X" target="_blank" >https://linkinghub.elsevier.com/retrieve/pii/S0169555X2400103X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.geomorph.2024.109153" target="_blank" >10.1016/j.geomorph.2024.109153</a>

Result language

angličtina

Original language name

Impact of large wood on sediment (dis)connectivity in a meandering river

Original language description

Large wood (LW) can exert strong influence on sediment storage patterns in fluvial systems. However its specificimpact on sediment routing is largely dependent on the stability of individual LW pieces or LW jams. We usedsediment (dis)connectivity principles to quantify the impact of LW on sediment erosion and storage along ameandering river reach. Decadal spatiotemporal changes of LW and fluvial landforms are appraised along a 3.65km long reach of the Odra River (Czechia). Detailed orthophotos at two-year intervals from 2012 to 2022 areanalysed alongside field inventories. During this study period, there was a single flood event with a 5–10-yearrecurrence interval, and three smaller flow events with a recurrence interval of up to 2 years. We assessed thesediment deposition, bank protection, and erosion effects of LW, finding that the impact of LW on deceleratingsediment fluxes was more pronounced. Specifically, LW-related deposition varied between 13.6 m2 and 36.7 m2per 100 m of channel length during the individual two-year periods. In contrast, we detected only 0.5 m2 to 7.8m2 per 100 m of channel length of newly eroded material during the same periods. Additionally, 6.3 % to 7.8 %of the lengths of the outer meander bends were protected by persistent LW elements against erosion during thesetwo-year periods. Finally, we developed a three-stage conceptual model depicting the impact of LW on sediment(dis)connectivity in a meandering river at different relative timescales. Our model accounts for the dependenceof interactions between LW and fluvial sediments based on the LW stability and frequency-magnitude of thehydrogeomorphic processes. In general, our observations suggest that the presence of stable LW in meanderingrivers primarily leads to the deceleration of the lateral and longitudinal dimensions of sediment (dis)connectivity.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10508 - Physical geography

Project

<a href="/en/project/GA22-17474S" target="_blank" >GA22-17474S: Biogeomorphic interactions in meandering rivers across different spatiotemporal scales</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

GEOMORPHOLOGY

ISSN

0169-555X

e-ISSN

1872-695X

Volume of the periodical

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Issue of the periodical within the volume

15 May 2024

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

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UT code for WoS article

001221125800001

EID of the result in the Scopus database

2-s2.0-85188181536