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Gully catchments as a sediment sink, not just a source: Results from a long term (~12 500 year) sediment budget

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Larsen, Annegret ; Heckmann, Tobias ; Larsen, Joshua ; Bork, Hans-Rudolf:
Gully catchments as a sediment sink, not just a source: Results from a long term (~12 500 year) sediment budget.
In: Earth surface processes and landforms : the journal of the British Geomorphological Research Group. 41 (2016) 4. - S. 486-498.
ISSN 0197-9337 ; 1096-9837

Volltext

Link zum Volltext (externe URL): https://doi.org/10.1002/esp.3839

Kurzfassung/Abstract

Sediment delivery from hillslopes to trunk streams represents a significant pathway of mass transfer in the landscape, with a large fraction facilitated by gully systems.

The internal gully geomorphic dynamics represent a considerable gap in many landscape and empirical erosion models, therefore a better understanding of these processes over longer timescales (10 – 104 yrs) is needed. This study analyses the sediment mass balance and storage dynamics within a headwater gully catchment in central Europe over the last ~12 500 yrs. Human induced erosion resulted in hillslope erosion rates ~2.3 times higher than under naturally de-vegetated conditions (during the Younger Dryas), however the total sediment inputs to the gully system (and therefore gully aggradation), were similar. Net gully storage has consistently increased to become the second largest term in the sediment budget after hillslope erosion (storage is ~45% and ~73% of inputs during two separate erosion and aggradation cycles). In terms of the depletion of gully sediment storage, the sediment mass balance shows that export beyond the gully fan was not significant until the last ~500 years, due to reduced gully fan accommodation space. The significance of storage effects on the gully sediment mass balance, particularly the export terms, means that it would be difficult to determine the influences of human impact and / or climatic changes from floodplain or lake sedimentary archives alone and that the sediment budgets of the headwater catchments from which they drain are more likely to provide these mechanistic links.

Weitere Angaben

Publikationsform:Artikel
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie
DOI / URN / ID:10.1002/esp.3839
Peer-Review-Journal:Ja
Titel an der KU entstanden:Ja
Eingestellt am:22. Sep 2015 12:35
Letzte Änderung:07. Feb 2019 15:33
URL zu dieser Anzeige:http://edoc.ku-eichstaett.de/16239/