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  Deriving debris-flow dynamics from real-time impact-force measurements

Yan, Y., Tang, H., Hu, K. H., Turowski, J., Wei, F.-q. (2023 online): Deriving debris-flow dynamics from real-time impact-force measurements. - Journal of Geophysical Research: Earth Surface.
https://doi.org/10.1029/2022JF006715

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Yan, Yan1, Autor              
Tang, Hui2, Autor              
Hu, K. H.3, Autor
Turowski, J.1, Autor              
Wei , Fang-qiang 3, Autor
Affiliations:
14.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146045              
24.7 Earth Surface Process Modelling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_1729888              
3External Organizations, ou_persistent22              

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Schlagwörter: DEAL Wiley
 Zusammenfassung: Understanding the impact forces exerted by debris flows is limited by a lack of direct field measurements and validated numerical models. In this study, we use real-time impact-force measurements and field observations of debris flows recorded by a sensor network in Jiangjia Ravine, China, to quantify the impact-force distribution of natural debris flows. We observed one debris flow event during and after a storm on August 25, 2004, including 42 short-duration surges and seven long-duration surges, and impact-force signals were successfully recorded for 38 surges. Our observed debris flows comprise high-viscosity laminar flows with high sediment concentration and frequent solid-to-solid interactions. We identified a large magnitude (up to 1 kN), high-frequency (greater than 1 Hz) fluctuating component of the impact force that we interpret as solid particle impact on the sensors. The variability of particle impact forces increases with the mean impact force. Our results show that a log-logistic distribution can describe the probability density distribution of impact forces. Solid-dominated surges and fluid-dominated intersurge flows have similar impact-force distributions, but surges usually have heavy tails. We created a dimensionless number to describe the impact force and correlated it against existing dimensionless parameters. Finally, we develop a simple particle impact model to understand the relationship between flow dynamics and the impact force inside debris flows that could be applied to improve debris-flow flume experiments and design debris-flow hazard mitigation measures.

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 Datum: 2023
 Publikationsstatus: Online veröffentlicht
 Seiten: -
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 Identifikatoren: DOI: 10.1029/2022JF006715
OATYPE: Hybrid - DEAL Wiley
GFZPOF: p4 T3 Restless Earth
GFZPOFWEITERE: p4 T5 Future Landscapes
 Art des Abschluß: -

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Titel: Journal of Geophysical Research: Earth Surface
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 2169-9003
ISSN: 2169-9011
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_earth_surface
Publisher: American Geophysical Union (AGU)
Publisher: Wiley