Research Article
Experimental Study on Local Scour and Related Mechanical Effects at River-Crossing Underwater Oil and Gas Pipelines
Table 1
Main physical quantities.
| Attributes | Physical quantities | Symbols | Dimensions |
| Water flow | Flow velocity | u | LT−1 | Water density | ρ | ML−3 | Kinetic viscosity | μ | ML−1·T−1 | Sediment | Median diameter | d50 | L | Sand density | ρs | ML−3 | Pipelines | Diameter | D | L | Other | Gravity | | LT−2 | Distance between the lower wall of the pipeline and the riverbed surface in the physical model | e | L | Scour depth | S | L |
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