Accession Number : ADA292149

Title :   Analyzing the Stability of Floating Ice Floes,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s) : Coutermarsh, Barry ; McGilvary, Randy

PDF Url : ADA292149

Report Date : DEC 1994

Pagination or Media Count : 27

Abstract : This report describes an experimental study to measure the pressure caused by fluid acceleration beneath a floating parallelepiped block. Dynamic fluid pressure was measured at discrete points beneath the block for several flow velocities, flow depths, block angles of attack and block-thickness-to-depth ratios. The measured pressures were used to calculate block underturning moments, and a hydrostatic analysis was used to calculate a block righting moment. From this, a densimetric Froude undertuming criterion is presented. The measured hydrodynamic pressure distribution on the bottom of a single model ice floe is used to estimate the dynamic stability at three thickness-to-depth ratios. The energy-based analysis details the conditions required for instability, metastability and stability. At three thickness-to-depth ratios, block rotational inertia has the effect of reducing the Froude stability number by 5 to 10% over a completely static stability criterion. (MM)

Descriptors :   *STABILITY, *HYDRODYNAMIC CHARACTERISTICS, *FLUID DYNAMICS, *MOMENT OF INERTIA, *ICEBERGS, VELOCITY, DENSITY, THICKNESS, ANGLE OF ATTACK, DEPTH, PRESSURE, GRAVITY, LEADING EDGES, ROTATION, PRESSURE DISTRIBUTION, FLOATING BODIES, HYDROSTATIC PRESSURE, FROUDE NUMBER, HYDRODYNAMIC CONTROL SURFACES.

Subject Categories : Snow, Ice and Permafrost
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE