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Dynamic controls on erosion and deposition on debris-flow fans

2011; Geological Society of America; Volume: 39; Issue: 9 Linguagem: Inglês

10.1130/g32103.1

1943-2682

Peter Schürch, Alexander L. Densmore, Nick Rosser, Brian W. McArdell,

Hydrology and Sediment Transport Processes

Research Article| September 01, 2011 Dynamic controls on erosion and deposition on debris-flow fans Peter Schürch; Peter Schürch * 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK2Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland *E-mail: p-s@gmx.ch. Search for other works by this author on: GSW Google Scholar Alexander L. Densmore; Alexander L. Densmore 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Nicholas J. Rosser; Nicholas J. Rosser 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Brian W. McArdell Brian W. McArdell 2Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Peter Schürch * 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK2Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland Alexander L. Densmore 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK Nicholas J. Rosser 1Department of Geography and Institute of Hazard, Risk, and Resilience, Durham University, South Road, Durham DH1 3LE, UK Brian W. McArdell 2Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland *E-mail: p-s@gmx.ch. Publisher: Geological Society of America Received: 24 Jan 2011 Revision Received: 30 Mar 2011 Accepted: 07 Apr 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (9): 827–830. https://doi.org/10.1130/G32103.1 Article history Received: 24 Jan 2011 Revision Received: 30 Mar 2011 Accepted: 07 Apr 2011 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Peter Schürch, Alexander L. Densmore, Nicholas J. Rosser, Brian W. McArdell; Dynamic controls on erosion and deposition on debris-flow fans. Geology 2011;; 39 (9): 827–830. doi: https://doi.org/10.1130/G32103.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Debris flows are among the most hazardous and unpredictable of surface processes in mountainous areas. This is partly because debris-flow erosion and deposition are poorly understood, resulting in major uncertainties in flow behavior, channel stability, and sequential effects of multiple flows. Here we apply terrestrial laser scanning and flow hydrograph analysis to quantify erosion and deposition in a series of debris flows at Illgraben, Switzerland. We identify flow depth as an important control on the pattern and magnitude of erosion, whereas deposition is governed more by the geometry of flow margins. The relationship between flow depth and erosion is visible both at the reach scale and at the scale of the entire fan. Maximum flow depth is a function of debris-flow front discharge and pre-flow channel cross-section geometry, and this dual control gives rise to complex interactions with implications for long-term channel stability, the use of fan stratigraphy for reconstruction of past debris-flow regimes, and the predictability of debris-flow hazards. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.