Debris-flow deposition: Effects of pore-fluid pressure and friction concentrated at flow margins

Abstract

Research Article| October 01, 1999 Debris-flow deposition: Effects of pore-fluid pressure and friction concentrated at flow margins Jon J. Major; Jon J. Major 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661 Search for other works by this author on: GSW Google Scholar Richard M. Iverson Richard M. Iverson 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661 Search for other works by this author on: GSW Google Scholar Author and Article Information Jon J. Major 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661 Richard M. Iverson 1U.S. Geological Survey, 5400 MacArthur Boulevard, Vancouver, Washington 98661 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1999) 111 (10): 1424–1434. https://doi.org/10.1130/0016-7606(1999)111<1424:DFDEOP>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jon J. Major, Richard M. Iverson; Debris-flow deposition: Effects of pore-fluid pressure and friction concentrated at flow margins. GSA Bulletin 1999;; 111 (10): 1424–1434. doi: https://doi.org/10.1130/0016-7606(1999)111<1424:DFDEOP>2.3.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 SocietyGSA Bulletin Search Advanced Search Abstract Measurements of pore-fluid pressure and total bed-normal stress at the base of several ∼10 m3 experimental debris flows provide new insight into the process of debris-flow deposition. Pore-fluid pressures nearly sufficient to cause liquefaction were developed and maintained during flow mobilization and acceleration, persisted in debris-flow interiors during flow deceleration and deposition, and dissipated significantly only during postdepositional sediment consolidation. In contrast, leading edges of debris flows exhibited little or no positive pore-fluid pressure. Deposition therefore resulted from grain-contact friction and bed friction concentrated at flow margins. This finding contradicts models that invoke widespread decay of excess pore-fluid pressure, uniform viscoplastic yield strength, or pervasive grain-collision stresses to explain debris-flow deposition. Furthermore, the finding demonstrates that deposit thickness cannot be used to infer the strength of flowing debris. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.