Abstract

The aim of the present study is to numerically investigate the scouring phenomenon downstream of a stilling basin for a wide range of Froude number and size of bed material. The numerical model was first verified. The results obtained from the numerical model concerning the maximum depth and profiles of the scoured hole were in agreement with the long-term experimental data. Thereupon, the verified numerical model was employed to simulate the profile of the scour hole for various Froude numbers and bed material sizes downstream of the stilling basin. According to the results of the numerical model as well as experimental data, it was revealed that by using dimensionless scour depth, the upstream profile of the scour hole is independent of time and size of the material. Results show that the bottom of the scour hole in the oscillating jump is of greater length than the steady jump. Moreover, both the numerical and available experimental data were used to propose a relationship for calculation of long-term maximum scour depth in a wide range of affecting parameters.

中文翻译：

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消融池下游冲刷的数值研究

摘要

本研究的目的是对弗劳德数和床层材料的各种弗劳德数在消沉池下游的冲刷现象进行数值研究。首先验证了数值模型。从数值模型中得到的关于冲孔最大深度和轮廓的结果与长期实验数据一致。随即，使用验证的数值模型来模拟消隐盆下游各种弗洛德数和床层材料尺寸的冲刷孔的轮廓。根据数值模型的结果和实验数据，发现通过使用无量纲的冲刷深度，冲刷孔的上游轮廓与材料的时间和尺寸无关。结果表明，振荡跳动中冲刷孔的底部比稳定跳动具有更长的长度。此外，数值和可用的实验数据均被用来提出一种关系，用于计算各种影响参数下的长期最大冲刷深度。