Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm

Fabbri, Stefano C.; Haas, Isabel; Kremer, Katrina; Motta, Danae; Girardclos, Stéphanie; Anselmetti, Flavio S. (2021). Subaqueous geomorphology and delta dynamics of Lake Brienz (Switzerland): implications for the sediment budget in the alpine realm. Swiss journal of geosciences, 114(1), p. 22. Springer 10.1186/s00015-021-00399-1

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Non-invasive techniques such as seismic investigations and high-resolution multibeam sonars immensely improved our understanding of the geomorphology and sediment regimes in both the lacustrine and the marine domain. How- ever, only few studies provide quantifications of basin wide-sediment budgets in lakes. Here, we use the combination of high-resolution bathymetric mapping and seismic reflection data to quantify the sediment budget in an alpine lake. The new bathymetric data of Lake Brienz reveal three distinct geomorphological areas: slopes with intercalated terraces, a flat basin plain, and delta areas with subaquatic channel systems. Quasi-4D seismic reflection data allow sediment budgeting of the lake with a total sediment input of 5.54 × 106 t sediment over 15 years of which three- quarter were deposited in the basin plain. Lake Brienz yields extraordinarily high sedimentation rates of 3.0 cm/yr in the basin plain, much more than in other Swiss lakes. This can be explained by (i) its role as first sedimentary sink in a high-alpine catchment, and by (ii) its morphology with subaquatic channel-complexes allowing an efficient sediment transfer from proximal to distal areas of the lake.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Fabbri, Stefano Claudio; Kremer, Katrina and Anselmetti, Flavio

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1661-8726

Publisher:

Springer

Language:

English

Submitter:

Flavio Anselmetti

Date Deposited:

27 Jan 2022 07:40

Last Modified:

01 Jun 2022 08:49

Publisher DOI:

10.1186/s00015-021-00399-1

PubMed ID:

34955703

BORIS DOI:

10.48350/162898

URI:

https://boris.unibe.ch/id/eprint/162898

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