Estimating aggregation between suspended sediments and frazil ice

• Main Author: Lars H. Smedsrud
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Sea ice
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.568.9881; http://folk.uib.no/ngfls/mypapers/smedsrud98.pdf

Abstract. This paper aims to describe the scavenging pro-cess, one of the main processes for incorporating sediments (particles) into sea ice. An experiment with suspended sed-iment and frazil ice in a homogeneous turbulent flow is pre-sented. At the end sediment where incorporated into the surface grease ice. The ice production was constant, and calculated from the salinity measurements, while the tur-bulent dissipation rate was calculated from high resolution current measurements. A model for aggregation between suspended sediment and frazil is also presented and used to simulate the experi-ment. The modelled aggregation process depends primarily on concentrations, on the turbulence levels, and on the (con-stant) radii of the sediments and ice. Eciency of the aggregation process is estimated from the model and experimental results, and the "aggregation" factor is found to be 0.025. This is consistent with the-oretical estimates, qualitative observations from laboratory experiments, and eld data. Sensitivity analyses suggest that the results does not depend greatly on uncertainty of model parameters.