Analysis of the Stability of Floating Ice Blocks

作者：Ambtman Karen E Dow^*; Steffler P M; Hicks F E

来源：Journal of Hydraulic Engineering, 2011, 137(4): 412-422.

DOI：10.1061/(ASCE)HY.1943-7900.0000316

• Floating ice
• River ice
• Hydraulic thickening
• Ice-cover stability

Determining the conditions under which an approaching ice floe becomes entrained under an intact ice cover is a fundamental component of any numerical model that attempts to successfully predict ice-jam formation or ice-jam release events. Current stability theory is based on empirical relationships that attempt to characterize stability on the basis of Froude number. This paper seeks to evaluate the stability of floating ice blocks though a force-moment analysis, building on previously published experimental results that measured the dynamic pressures beneath a floating ice block under various thickness-to-depth ratios and flow velocities. The experimental results were extended to measure the dynamic pressures beneath a block that had rotated about its downstream corner until the top upstream corner was at the water surface elevation, giving an indication of how the submerging force and underturning moment changes as the block begins to rotate. The force-moment analyses developed in this paper were compared with previously published observations of block entrainment and were found to match those observations well. DOI:10.1061/(ASCE)HY.1943-7900.0000316.

• 出版日期2011-4