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    Catchment-scale network analysis of functional sediment connectivity during an extreme rainfall event in the Grastal catchment, Austrian Central Alps

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    Himmelstoss, Toni ; Haas, Florian ; Becht, Michael ; Heckmann, Tobias:
    Catchment-scale network analysis of functional sediment connectivity during an extreme rainfall event in the Grastal catchment, Austrian Central Alps.
    In: Geomorphology. 465 (2024): 109419.
    ISSN 0169-555x ; 1872-695x

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    Volltext Link zum Volltext (externe URL):
    https://doi.org/10.1016/j.geomorph.2024.109419

    Kurzfassung/Abstract

    Global warming significantly impacts sediment dynamics in glaciated catchments, affecting water resource operations, water quality, recreational activities, and ecological systems. The propagation of climate-change-induced geomorphic changes and the catchment's sediment yield are moderated by sediment connectivity, defined as the degree to which a geomorphic system facilitates sediment transfer. Quantifying functional sediment connectivity at the catchment scale remains a challenge. To address this, we propose a novel approach combining graph theory with the morphological method. This approach is exemplified through a detailed case study of a 2022 thunderstorm event in the Grastal valley, Tyrol, Austria. First, a graph of potential sediment cascades is constructed using a geomorphological map, a digital elevation model and a flow routing algorithm. A short-term Digital Elevation Model of Difference (DoD) from consecutive ALS surveys is then used to infer sediment fluxes and calculate the Sediment Delivery Ratio (SDR) for each landform. The primary sediment mobilising processes were debris flows and fluvial erosion, with a significant proportion of debris flow material being deposited on slopes, not reaching the fluvial corridor. Strong fluvial erosion was observed in the proglacial area, but the propagation of these geomorphic changes is halted by an alluvial fan and a lake. Most landforms can be clearly categorised as connecting or disconnecting features based on their SDR. In total, a maximum of 12 % of mobilised sediments exited the catchment. Our findings demonstrate that (i) short-term, catchment-wide DoDs are valuable for assessing functional connectivity at an event temporal scale, (ii) using landforms as fundamental spatial units allows for the identification and in-depth analysis of critical sediment sinks and sources, and (iii) graph analysis facilitates the catchment-wide calculation of sediment delivery ratios between meaningful fundamental units and the delineation of significant sediment cascades.

    Forschungsprojekte

    Research Unit SEHAG - Sensitivity of high Alpine geosystems to climate change since 1850 (SEHAG) - Phase II

    Weitere Angaben

    Publikationsform:Artikel
    Schlagwörter:Sediment connectivity; Graph theory; Landforms; Sediment budget; DEM of Difference
    Sprache des Eintrags:Englisch
    Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie
    DOI / URN / ID:10.1016/j.geomorph.2024.109419
    Open Access: Freie Zugänglichkeit des Volltexts?:Ja
    Peer-Review-Journal:Ja
    Verlag:Elsevier
    Die Zeitschrift ist nachgewiesen in:
    Titel an der KU entstanden:Ja
    KU.edoc-ID:33680
    Eingestellt am: 06. Sep 2024 10:30
    Letzte Änderung: 06. Sep 2024 10:30
    URL zu dieser Anzeige: https://edoc.ku.de/id/eprint/33680/
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