If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Frazil-ice entrainment of sediment: large-tank laboratory experiments

$37.91 plus tax (Refund Policy)

Buy Article:

Abstract:

Laboratory experiments that simulate natural ice-formation processes and sediment entrainment in shallow water are presented. A 10-30 cm s-1 current was forced with impellers in a 20 m long, 1m deep indoor tank. Turbulence in the flow maintained a suspension of sediments at concentrations of 10-20 mg L-1 at 0.5 m depth. Low air temperatures (~ -15°C) and 5 m s-1 winds resulted in total upward heat fluxes in the range 140-260 W m-2. The cooling produced frazil-ice crystals up to 2 cm in diameter with concentrations up to 4.5 g L-1 at 0.5 m depth. Considerable temporal variability with time-scales of <1 min was documented. A close to constant portion of the smaller frazil crystals remained in suspension. After some hours the larger crystals, which made up most of the ice volume, accumulated as slush at the surface. Current measurements were used to calculate the turbulent dissipation rate, and estimates of vertical diffusion were derived. After 5-8 hours, sediment concentrations in the surface slush were normally close to those of the water. After 24 hours, however, they were 2-4 times higher. Data indicate that sediment entrainment depends on high heat fluxes and correspondingly high frazil-ice production rates, as well as sufficiently strong turbulence. Waves do not seem to increase sediment entrainment significantly.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756501781832142

Publication date: June 1, 2001

More about this publication?
  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
  • Editorial Board
  • Information for Authors
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more