Levee scour from overtopping storm waves and scour counter measures
Levee scour from overtopping storm waves and scour counter measures
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暴浪冲刷堤坝及冲刷对策
DOI：
10.1016/j.oceaneng.2012.09.006
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发表时间：
2013
影响因子：
5
通讯作者：
John Schooler
中科院分区：
文献类型：
--
作者：
E. B. Johnson;F. Testik;N. Ravichandran;John Schooler
在室内进行了堤面漫顶冲刷试验。本研究的目的是阐明陆边堤防冲刷特征，并评价所选冲刷对策的有效性。建立了有防冲措施和没有防冲措施的模型堤防。测试了四种防冲刷装甲：抛石，coreloc，抛石带衬底，coreloc带衬底。堤土是由砂粘土混合物组成的。最大冲刷深度和冲刷长度是具有重要实际意义的几何冲刷特征。最大冲刷深度和冲刷长度均呈指数趋势接近平衡值，冲刷长度较早达到平衡。提出了在接近平衡状态和平衡状态下预测最大冲刷深度和最大冲刷长度的参数化方法。尽管抛石装甲被证明比岩心装甲更有效，但装甲下层的存在更大程度上推动了这两种保护措施类型的整体有效性。因此，建议在现场适当调整下垫层的布置和尺寸分布，以获得最大的防灾效益和经济效益。
Laboratory wavetank experiments were performed on the landside levee scour induced by floodwall overtopping. The objectives of this study were to elucidate the landside levee scour characteristics and evaluate the effectiveness of selected scour counter measures. Model levees, both with and without a scour protection measure, were constructed. Four scour protection armoring were tested: riprap, coreloc, riprap with an underlayer, and coreloc with an underlayer. The levee soil was composed of a sand-clay mixture. The geometric scour characteristics of interest driven by their practical importance were maximum scour depth and scour length. Both the maximum scour depth and the scour length exhibited an exponential trend in approaching equilibrium values, with the scour length reaching equilibrium sooner. Parameterizations for predicting the values of the maximum scour depth and length while approaching the equilibrium and at the equilibrium state were developed. Though the riprap armoring cover proved more effective than the coreloc armoring cover, the presence of an armoring underlayer was a greater impetus of the overall effectiveness of both protection measure types. Therefore, it is recommended that the placement and size distribution of the underlayer be adjusted in the field accordingly for the greatest disaster prevention and economic advantage.