Hydroplaning of subaqueous debris flows

David Mohrig, Kelin X. Whipple, Midhat Hondzo, Chris Ellis, Gary Parker

Research output: Contribution to journalArticlepeer-review

385 Scopus citations


We report laboratory experiments that demonstrate that the fronts of subaqueous debris flows can hydroplane on thin layers of water. The hydroplaning dramatically reduces the bed drag, thus increasing head velocity. These high velocities promote sediment suspension and turbidity-current formation. Hydroplaning causes the fronts of debris flows to accelerate away from their bodies to the point of completely detaching from the bodies, producing surging. Instigation of hydroplaning is controlled by the balance of gravity and inertia forces at the debris front and is suitably characterized by the densimetric Froude number. The laboratory flows constrain hydroplaning to cases where the calculated densimetric Froude number is greater than 0.4. The presence of a basal lubricating layer of water underneath hydroplaning debris flows and slides offers a possible explanation for the long run-out distances of many subaqueous flows and slides on very low slopes.

Original languageEnglish (US)
Pages (from-to)387-394
Number of pages8
JournalBulletin of the Geological Society of America
Issue number3
StatePublished - Mar 1998
Externally publishedYes

ASJC Scopus subject areas

  • Geology


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