Author(s): Jon E. Zufelt

Linked Author(s): Jon Zufelt

Keywords: No Keywords

Abstract: While several models have been developed over the past 25 years to simulate ice cover progression and the shoving and thickening process, it remains as one of the least understood topics in ice hydraulics. Most models are based on some adaptation of equilibrium ice thickness theory and treat ice shoving and thickening as a steady or quasi-steady process. During ice shoving, the water and ice flows are highly unsteady. Discharge is constantly changing as a result of ice transport and deposition under the cover. The interaction between the flows of ice and water is very complex, and except at the ice surface, it is almost impossible to observe in nature. As a first step to improve the understanding of shoving and thickening, several series of experiments were conducted to observe and document the process. The experiments were conducted In laboratory flumes using real and plastic ice. Stable brash ice accumulations were formed in the flume, and the discharge was then varied to induce shoving and thickening. Hydraulic and ice data were gathered, including velocity, ice thickness, and jam length. These observations are presented, and the data are compared to results from equilibrium-based models. Differences berween the experimental and theoretical results are identified. and explanations for these differences are given.

DOI:

Year: 1990