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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

<a href="/cs/project/GA22-17474S" target="_blank" >GA22-17474S: Biogeomorfologické interakce v meandrujících řekách napříč rozdílnými časoprostorovými měřítky</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

GEOMORPHOLOGY

ISSN

0169-555X

e-ISSN

1872-695X

Svazek periodika

—

Číslo periodika v rámci svazku

15 May 2024

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

001221125800001

EID výsledku v databázi Scopus

2-s2.0-85188181536