Experimental study of critical condition of ice jam formation in a curved channel
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Abstract:
Ice jam is a common phenomenon for rives in cold regions. Lodgment and gorging can easily occur especially in curved channels. The formation of ice jam and its thickness distribution in curved channels were not fully understood. By changing the flow conditions and ice discharge in a flume in the laboratory, the condition of ice jam forming in a curved channel and straight flute was studied and comparatively analyzed. The experiment results showed that the threshold Fr number of ice jam forming for curved channel was larger than that for straight flute, that is to say under the condition of the same water depth, the bigger velocity of curved channel could also form ice jam. The Fr number of ice jam formation in a curved channel ranged larger than that in straight flute. The curved channel was more likely to form ice jam. Balance of ice jam thickness decreased with the increase of initial velocity, roughly increased as the initial water depth increased, and increased with the increase of the ice flow rule.
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