Shields number
E902444
The Shields number is a dimensionless parameter in sediment transport that characterizes the initiation of particle motion on a bed under fluid flow by relating shear stress to the submerged weight of the particles.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Shields number canonical | 1 |
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
dimensionless number
ⓘ
sediment transport parameter ⓘ |
| alsoKnownAs |
Shields criterion
NERFINISHED
ⓘ
Shields parameter ⓘ |
| appliesTo |
bed material in open-channel flow
ⓘ
noncohesive sediment ⓘ subaqueous sediment beds ⓘ |
| assumes | uniform sediment size in basic form ⓘ |
| characterizes |
incipient motion of bed particles
ⓘ
initiation of sediment motion ⓘ threshold of sediment transport ⓘ |
| criticalValueDependsOn |
bed roughness regime
ⓘ
particle Reynolds number ⓘ |
| definedAs | ratio of bed shear stress to submerged specific weight of sediment times particle diameter ⓘ |
| dependsOn |
bed shear stress
ⓘ
fluid density ⓘ gravitational acceleration ⓘ particle density ⓘ particle diameter ⓘ |
| dimension | dimensionless ⓘ |
| field |
coastal engineering
ⓘ
fluid mechanics ⓘ fluvial geomorphology ⓘ hydraulics ⓘ sediment transport ⓘ |
| introducedBy | Albert F. Shields NERFINISHED ⓘ |
| introducedIn | 1936 ⓘ |
| mathematicalForm | θ = τ / [(ρ_s − ρ) g d] ⓘ |
| namedAfter | Albert F. Shields NERFINISHED ⓘ |
| publicationContext | experiments on incipient motion of sediment in open channels ⓘ |
| relatedTo |
Shields diagram
ⓘ
critical Shields parameter ⓘ particle Reynolds number ⓘ |
| relates | bed shear stress to submerged particle weight ⓘ |
| typicalSymbol |
θ
ⓘ
τ* ⓘ |
| usedFor |
channel stability analysis
ⓘ
design of hydraulic structures ⓘ predicting onset of bedload transport ⓘ river engineering calculations ⓘ sediment mobility assessment ⓘ |
| usedWith |
Shields curve
ⓘ
dimensionless shear stress ⓘ |
| variable |
d
ⓘ
g ⓘ ρ ⓘ ρ_s ⓘ τ ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.