The bubble bursts for cavitation in natural rivers: laboratory experiments reveal minor role in bedrock erosion

Paul A. Carling, Mauricio Perillo, Jim Best, Marcelo H. Garcia

Research output: Contribution to journalArticle

Abstract

The erosion of rock-bedded channels generally is considered a slow process caused mainly by abrasion due to bedload or suspended sediments, but the mechanisms of rapid erosion remain unclear. Cavitation is a clear-fluid erosive process, well known for its effect on engineering structures, when water vapour bubbles collapse and the resultant pressure shocks erode the boundary. However, although the occurrence of cavitation erosion in natural watercourses has long been a matter of debate, as yet there are no incontrovertible examples of cavitation damage to natural river beds. Using flume experiments, we show for the first time that only weakly-cavitating clear-water flows can occur for the range of flow velocities observed in rivers, and these do not erode medium-hardness rocks after 68 hours. During this time period, only a very soft rock featured erosional marks due to dissolution. Thus, our results cast significant doubt on the likelihood of identifying cavitation damage in most rivers, and provide pointers to those river systems that might be investigated further to identify cavitation erosion.

Original languageEnglish (US)
Pages (from-to)1308-1316
Number of pages9
JournalEarth Surface Processes and Landforms
Volume42
Issue number9
DOIs
StatePublished - Jul 2017

Keywords

  • abrasion
  • bedrock channels
  • bedrock erosion
  • cavitation
  • dissolution

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Earth-Surface Processes
  • Earth and Planetary Sciences (miscellaneous)

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