不同透水率对水力插板透水丁坝防冲促淤效果的试验研究

水力插板透水丁坝新型护岸结构的提出提高了新疆粉细沙河床上治河工程的防洪护岸效益。本文为了探讨透水率对水力插板透水丁坝防冲促淤效果的影响,利用动床模型水槽试验研究了水力插板透水丁坝缓流效果、局部冲刷及坝后最大淤积高度随透水率的变化规律,为透水率这个重要工程设计参数的合理选取提供理论依据。试验结果表明:水力插板透水丁坝坝后流速的减缓效果明显,且透水率对坝后流速的影响较小;坝头最大冲刷深度随着透水率的增大而变小;坝后最大淤积高度随透水率的增加先增加后减小;当透水率为30%左右时,水力插板透水丁坝的防冲促淤效果达到最佳。

Experiment of scour prevention and sedimentation promotion effect for hydraulic flashboard permeable spur dike in different water permeability rates

The use of new revetment structure of hydraulic flashboard permeable spur dike increases the benefits of flood control and revetment engineering at Xinjiang silt sand bed.In order to explore the influence of water permeability rate on scour prevention and sedimentation promotion effect of hydraulic flashboard permeable spur dike,the paper used movable-bed model test to study the change law of slow flow effect, local scour depth and maximum sedimentation height with water permeability rate so as to provide theory reference for the reasonable selection of engineering design parameters.The result showed that hydraulic flashboard permeable spur dike has a significant effect on reducing flow velocity after dam.The water permeability rate has less influence on velocity of flow behind dam. The maximum scour depth deceases with the increase of water permeability rate. The maximum sedimentation height of dam firstly increases and then decreases along with the increase of water permeability rate.When water permeability rate is 30 percent, the scour prevention and sedimentation promotion effect of the dam gets the best.