Accession Number : ADA017880

Title :   Hydraulics and Mechanics of River Ice Jams,

Corporate Author : IOWA INST OF HYDRAULIC RESEARCH IOWA CITY

Personal Author(s) : Uzuner,Mehmet Secil ; Kennedy,John F.

Report Date : MAY 1974

Pagination or Media Count : 167

Abstract : An analytical model is developed for evolution of embacles in rivers. The differential equations underlying the analysis are the static force equilibrium relation for the fragmented ice cover; the unsteady, nonuniform momentum relation for the liquid flow beneath the ice; and the unsteady continuity equations for the solid and liquid phases. The analysis is limited to the case of uniform, rectangular channels. It yields predictions for the streamwise distribution of the thickness of the ice cover and the depth of flow beneath it; the flow depth and cover thickness over the uniform downstream reach where the jam thickness and flow depth are constant; the flow depth at the upstream end of the jam; and the velocity of propagation of the jam front. Estimates are also obtained for the rate of growth of a jam during early stages of its evolution, just following initiation.

Descriptors :   *Rivers, *Ice formation, *Ice breakup, Channel flow, Blocking, Hydraulic models, Computer programs

Subject Categories : Hydrology, Limnology and Potamology
      Snow, Ice and Permafrost
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE