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Sensitivity analysis of bridge pier scour depth predictive formulae

机译:桥墩冲刷深度预测公式的敏感性分析

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Sensitivity analysis is an approach to recognising the behaviour of models and relative importance of causative factors. In this paper, behaviours of six pier scour depth empirical formulae are evaluated on the basis of an analytical method. The sensitivity of predicted scour depth is analysed with respect to the following independent parameters: approach flow depth, riverbed slope and median sediment size. Also their combined influence is studied examining the relative importance of each parameter with respect to the total variation of the maximum scour depth. Results show that: (1) sensitivity significantly depends on flow intensity for most of the selected formulae, whereas for the others it is a constant value or depends on other influencing parameters; (2) different formulae demonstrate various level of sensitivity to the input variables, so that, for a certain error in the input variables, the error in the results may vary consistently; (3) some formulae are very sensitive to the input parameters under some conditions, hence an error in an input variable may be amplified in the output results; and (4) most of the formulae are more sensitive to the variations of the influencing parameters in clear-water than in live-bed conditions.
机译:敏感性分析是一种识别模型行为和因果关系的相对重要性的方法。本文在分析方法的基础上,对六个墩台冲刷深度经验公式的行为进行了评估。针对以下独立参数分析了预测冲刷深度的敏感性:进水深度,河床坡度和中值沉积物尺寸。还研究了它们的综合影响,研究了每个参数相对于最大冲刷深度的总变化的相对重要性。结果表明:(1)灵敏度在很大程度上取决于大多数选定公式的流量强度,而对于其他公式,它是一个恒定值或取决于其他影响参数; (2)不同的公式显示出对输入变量的不同程度的敏感性,因此,对于输入变量中的某些误差,结果误差可能会一致地变化; (3)有些公式在某些条件下对输入参数非常敏感,因此输入变量的误差可能会在输出结果中放大; (4)与活床条件相比,大多数公式对清水中影响参数的变化更为敏感。

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