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Lithologic and glacially conditioned controls on regional debris-flow sediment dynamics

2012; Geological Society of America; Volume: 40; Issue: 5 Linguagem: Inglês

10.1130/g33106.1

1943-2682

Francesco Brardinoni, Michael Church, Alessandro Simoni, Pierpaolo Macconi,

Cryospheric studies and observations

Research Article| May 01, 2012 Lithologic and glacially conditioned controls on regional debris-flow sediment dynamics Francesco Brardinoni; Francesco Brardinoni * 1Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Milan, Italy *E-mail: francesco.brardinoni@unimib.it. Search for other works by this author on: GSW Google Scholar Michael Church; Michael Church 2Department of Geography, University of British Columbia, Vancouver, Canada Search for other works by this author on: GSW Google Scholar Alessandro Simoni; Alessandro Simoni 3Dipartimento di Scienze della Terra e Geologico-Ambientali, Università degli Studi di Bologna, Bologna, Italy Search for other works by this author on: GSW Google Scholar Pierpaolo Macconi Pierpaolo Macconi 4Ripartizione Opere Idrauliche, Provincia Autonoma di Bolzano, Bolzano, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Francesco Brardinoni * 1Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Milan, Italy Michael Church 2Department of Geography, University of British Columbia, Vancouver, Canada Alessandro Simoni 3Dipartimento di Scienze della Terra e Geologico-Ambientali, Università degli Studi di Bologna, Bologna, Italy Pierpaolo Macconi 4Ripartizione Opere Idrauliche, Provincia Autonoma di Bolzano, Bolzano, Italy *E-mail: francesco.brardinoni@unimib.it. Publisher: Geological Society of America Received: 09 Dec 2011 Accepted: 04 Jan 2012 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (5): 455–458. https://doi.org/10.1130/G33106.1 Article history Received: 09 Dec 2011 Accepted: 04 Jan 2012 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Francesco Brardinoni, Michael Church, Alessandro Simoni, Pierpaolo Macconi; Lithologic and glacially conditioned controls on regional debris-flow sediment dynamics. Geology 2012;; 40 (5): 455–458. doi: https://doi.org/10.1130/G33106.1 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 flow is an efficient process of sediment transfer from slope base to piedmont depositional fans in mountain drainage basins. To advance understanding of debris-flow sediment dynamics at the regional scale, we analyze a historical (1998–2009) database of debris flows from 77 basins of Alto Adige Province, northeastern Italy. By combining information on event volumetric deposition, high-resolution digital topography, and Quaternary sediment mapping we are able to link debris-flow sediment flux to morphometry, lithologic variability, and sediment availability. We show that basin-wide specific sediment yield (SSY) scales as an inverse power function of basin area. This function is strongly controlled by the way rock type and abundance of Quaternary deposits affect the rate of downstream sediment recruitment. When sediment flux associated with each debris-flow event is subsumed across discrete spatial increments of the entire region, a complex sedimentary signature in the area-SSY space is apparent. That is, SSY increases downstream up to areas as large as 1 km2, and starts to decline beyond this scale, regardless of sediment availability. We propose that this area-SSY relation is characteristic of debris flow–dominated settings. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.