Page 88 - 2021年第52卷第8期

A laboratory study on seepage flow resistance of ice jams

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ZHAO Shuixia ，SHEN Hung Tao
（1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，
Institute of Water Resources for Pastoral Area，Ministry of Water Resources，Hohhot 010020，China；
2. Department of Civil and Environmental Engineering，Clarkson University，Potsdam，New York 13699，USA）

Abstract：The head loss of ice jams is mainly related to the seepage flow resistance. A laboratory study is
conducted to evaluate this head loss. By setting different hydraulic conditions， the ice jam profile and un⁃
dercover velocity distribution are obtained along ice jams. The non-Darcy seepage flow theory is used to cal⁃
culate the seepage head loss. The results show that the seepage head loss is an important part of the flow
resistance of ice jams， which accounts for 11% ～21% of the total energy loss， especially near the jam
toe，up to 42%. There is a positive correlation between seepage head loss and the ratio of ice thickness to
water depth. The seepage discharge is an important storage water，which accounts for 9%～26% of the to⁃
tal discharge when the jam porosity is 0.39～0.51， and the ratio of ice thickness to water depth is 0.6～
1.4. The porosity， ice jam structure and hydraulic characteristics have all effect on the seepage discharge.
In the case of uniform and random accumulation of ice particles， the thicker and the more compact the
ice jam thickness is，the smaller the porosity and seepage coefficient will be，which cause the larger seep⁃
age head loss due to the larger specific surface area of fluid passing through porous media. The mechanism
of ice jam resistance and the significance of seepage resistance in the ice jam are examined to provide in⁃
formation for solving ice jam problems in the basin troubled by the ice flood disaster.
Keywords：ice jam；flow resistance；non-Darcy seepage；energy loss；laboratory study
（责任编辑：李福田）

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