Shields parameter
E261323
The Shields parameter is a dimensionless number in sediment transport theory that characterizes the initiation of particle motion on a bed by relating fluid shear stress to the submerged weight of sediment grains.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Shields parameter canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2361977 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Shields parameter Context triple: [Einstein bed-load function, usesConcept, Shields parameter]
-
A.
Shields
Shields is a common English and Irish surname borne by numerous notable individuals across politics, sports, entertainment, and public life.
-
B.
Freedom Shield
Freedom Shield is a major annual joint military exercise conducted by the United States and South Korea to enhance readiness and deter threats on the Korean Peninsula.
-
C.
tri-shield emblem
The tri-shield emblem is Buick’s distinctive three-shield logo, symbolizing the brand’s heritage and identity in the automotive industry.
-
D.
Defensive Aids Sub-System
The Defensive Aids Sub-System is an integrated electronic warfare and self-protection suite designed to detect, identify, and counter threats to the Eurofighter Typhoon FGR4.
-
E.
SS guards
SS guards were members of Nazi Germany’s Schutzstaffel who enforced brutal control, violence, and mass murder in concentration and extermination camps during the Holocaust.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Shields parameter Target entity description: The Shields parameter is a dimensionless number in sediment transport theory that characterizes the initiation of particle motion on a bed by relating fluid shear stress to the submerged weight of sediment grains.
-
A.
Shields
Shields is a common English and Irish surname borne by numerous notable individuals across politics, sports, entertainment, and public life.
-
B.
Freedom Shield
Freedom Shield is a major annual joint military exercise conducted by the United States and South Korea to enhance readiness and deter threats on the Korean Peninsula.
-
C.
tri-shield emblem
The tri-shield emblem is Buick’s distinctive three-shield logo, symbolizing the brand’s heritage and identity in the automotive industry.
-
D.
Defensive Aids Sub-System
The Defensive Aids Sub-System is an integrated electronic warfare and self-protection suite designed to detect, identify, and counter threats to the Eurofighter Typhoon FGR4.
-
E.
SS guards
SS guards were members of Nazi Germany’s Schutzstaffel who enforced brutal control, violence, and mass murder in concentration and extermination camps during the Holocaust.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
dimensionless number
ⓘ
hydraulic engineering concept ⓘ sediment transport parameter ⓘ |
| alsoKnownAs | Shields number ⓘ |
| appliesTo |
noncohesive sediment beds
ⓘ
uniform sediment beds ⓘ |
| assumes | steady uniform flow in its classical derivation ⓘ |
| category |
Fluid mechanics
ⓘ
Hydraulics ⓘ Earth sciences ⓘ
surface form:
Sedimentology
|
| characterizes | initiation of particle motion ⓘ |
| definedBy | ratio of bed shear stress to submerged specific weight of sediment times grain diameter ⓘ |
| dependsOn |
bed shear stress
ⓘ
fluid density ⓘ gravitational acceleration ⓘ sediment density ⓘ sediment grain size ⓘ |
| dimension | dimensionless ⓘ |
| hasCriticalValue | critical Shields parameter for incipient motion ⓘ |
| hasFormula | θ = τ / [(ρ_s − ρ) g d] ⓘ |
| hasVariable |
d (sediment grain diameter)
ⓘ
g (gravitational acceleration) ⓘ ρ (fluid density) ⓘ ρ_s (sediment density) ⓘ τ (bed shear stress) ⓘ |
| introducedBy | Albert F. Shields ⓘ |
| introducedIn | 1936 ⓘ |
| relatedTo |
Meyer-Peter–Müller bed-load formula
ⓘ
surface form:
Meyer-Peter–Müller formula
Shields curve ⓘ bedload transport equations ⓘ particle Reynolds number ⓘ |
| relates | fluid shear stress to submerged weight of sediment grains ⓘ |
| symbol |
θ
ⓘ
τ* ⓘ |
| usedFor |
assessment of erosion risk
ⓘ
design of stable channels ⓘ prediction of bedload transport ⓘ |
| usedIn |
coastal engineering
ⓘ
dimensionless analysis of sediment motion ⓘ fluvial hydraulics ⓘ numerical morphodynamic simulations ⓘ river morphodynamics models ⓘ sediment transport theory ⓘ |
| usedToDetermine | critical shear stress for incipient motion ⓘ |
| variesWith |
bed roughness conditions
ⓘ
flow regime ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Shields parameter Description of subject: The Shields parameter is a dimensionless number in sediment transport theory that characterizes the initiation of particle motion on a bed by relating fluid shear stress to the submerged weight of sediment grains.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.