New views of granular mass flows

Abstract

Research Article| February 01, 2001 New views of granular mass flows Richard M. Iverson; Richard M. Iverson 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661, USA Search for other works by this author on: GSW Google Scholar James W. Vallance James W. Vallance 2Department of Civil Engineering and Applied Mechanics, McGill University, Montreal, Quebec H3A 2FK6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Richard M. Iverson 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661, USA James W. Vallance 2Department of Civil Engineering and Applied Mechanics, McGill University, Montreal, Quebec H3A 2FK6, Canada Publisher: Geological Society of America Received: 02 Jun 2000 Revision Received: 16 Oct 2000 Accepted: 25 Oct 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (2): 115–118. https://doi.org/10.1130/0091-7613(2001)029<0115:NVOGMF>2.0.CO;2 Article history Received: 02 Jun 2000 Revision Received: 16 Oct 2000 Accepted: 25 Oct 2000 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Richard M. Iverson, James W. Vallance; New views of granular mass flows. Geology 2001;; 29 (2): 115–118. doi: https://doi.org/10.1130/0091-7613(2001)029<0115:NVOGMF>2.0.CO;2 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 Concentrated grain-fluid mixtures in rock avalanches, debris flows, and pyroclastic flows do not behave as simple materials with fixed rheologies. Instead, rheology evolves as mixture agitation, grain concentration, and fluid-pressure change during flow initiation, transit, and deposition. Throughout a flow, however, normal forces on planes parallel to the free upper surface approximately balance the weight of the superincumbent mixture, and the Coulomb friction rule describes bulk intergranular shear stresses on such planes. Pore-fluid pressure can temporarily or locally enhance mixture mobility by reducing Coulomb friction and transferring shear stress to the fluid phase. Initial conditions, boundary conditions, and grain comminution and sorting can influence pore-fluid pressures and cause variations in flow dynamics and deposits. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.