Investigation of bed shear stresses subject to external turbulence
The fluctuating bed shear stress has largely been investigated only for uniform channel flows and boundary layers. In practical engineering, the flow conditions are often modified due to the presence of various hydraulic structures. To what extent the modification affects the known cha...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/79470 http://hdl.handle.net/10220/7643 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The fluctuating bed shear stress has largely been investigated only for uniform channel flows and boundary layers. In practical
engineering, the flow conditions are often modified due to the presence of various hydraulic structures. To what extent the modification
affects the known characteristics of the bed shear stress is not clear. This study presents experimental results of the bed shear
stress fluctuations, which are obviously subjected to external turbulence generated by superimposing artificial structures in the open
channel flows. The statistical analysis of the measurements shows that the probability density function of the bed shear stress can be
described by the lognormal function. Some associated relations concerning higher-order moments, skewness and kurtosis, which are
derived from the lognormal function, are further compared with the experimental data. Physical implication of the skewed probability
density distribution is finally discussed. |
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