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PROGRESS IN STUDIES ON ICE ACCUMULATION IN RIVER BENDS

Journal of Hydrodynamics 2011年第6期23卷 737-744页

作者： WANG Jun CHEN Pang-pang SUI Jue-yi School of Civil Engineering Hefei University of Technology Heifei 230029 China Environmental Engineering Program University of Northern British Columbia Prince George British ColumbiaCanada V2N 4V9

River ice is an important hydraulic element in temperate and polar environments and would affect hydrodynamic conditions of rivers through changes both in the boundary conditions and the thermal regime. The river bend has been reported as the common location for the initiation of ice jams because the water flow along a river bend is markedly affected by the channel curvature. In this article, the experimental studies about the ice accumulation in a river bend are reviewed. Based on experiments conducted so far, the criteria for the formation of ice jams in the river bend, the mechanisms of the ice accumulation in the river bend and the thickness profile of the ice accumulation in the river bend are discussed. The two-equation turbulence model is used to simulate the ice accumulation under an ice cover along a river bend. A formula is proposed for describing the deformation of the ice jam bottom. Our results indicate that all simulated thickness of the ice accumulation agrees reasonably well with the measured thickness of the ice accumulation in the laboratory.

关键词： experiment ice jam/accumulation bend channel thickness profile

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Mechanisms of ice accumulation in a river bend-an experimental study

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International Journal of Sediment Research 2012年第4期27卷 521-537页

作者： Jun WANG Jue-yi SUI Hong-ya ZHANG Pang-pang CHEN Faye HIRSHFIELD School of Civil Engineering Hefei University of Technology Environmental Engineering Program University of Northern British Columbia Prince George Anhui Institute of Architectural and Industry Environmental Science Program University of Northern British Columbia Prince George

In this study,under conditions of different flow and ice discharge,extensive experiments have been carried out in a 180°-bend flume and an S-shaped bend *** phenomenon and mechanisms of ice accumulation in the bend channel have been *** accumulation along the convex bank was normally thicker than that along the concave *** maximum thickness of ice accumulation in the downstream bend channel occurred close to the convex *** difference between the maximum thickness and the minimum thickness of ice accumulation was *** entire ice accumulation became unstable if flow Froude number was *** the flow Froude Number is high,the entire ice accumulation becomes *** Froude Number between 0.035 and 0.060,the bottom surface of ice accumulation became waved in *** changes in Froude number and ice discharge rate can change a channel from a state of no ice accumulation to uniform accumulation over the channel *** higher the ice discharge,the more uniform the ice *** experimental results have been compared with field observations of ice jams at the Hequ Reach of the Yellow River.

关键词： 180°bend flume Frazil ice Ice jam or ice accumulation S-shape bend channel thickness profile

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