【摘 要】
：
The hydraulic resistance of the river ice jams consists of the resistances due to the seepage flow through the jam and the shear stress on the undersurface of the jam.Existing empirical formulations consider only the the undersurface resistance of the jam
【机 构】
：
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;Development Research
论文部分内容阅读
The hydraulic resistance of the river ice jams consists of the resistances due to the seepage flow through the jam and the shear stress on the undersurface of the jam.Existing empirical formulations consider only the the undersurface resistance of the jam,and come up with relations between the jam resistance and the jam thickness with very slight theoretical basis.Based on the analysis of the seepage flow resistance and the flow resistance of the undersurface of the jam,it is shown that the resistance due to the seepage flow is a dominating part of the jam resistance,except for the portion of the jam where the thickness is very small.This analysis also shows that the total jam resistance can be approximated by a linear ftmction of the jam thickness or the ratio of the jam thickness to the flow depth under the jam.
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