Assertion: sediment | /r/AtLocation | rest
Facets:
value: on a surface
type: LOCATION
value: currently
type: TEMPORAL
Source sentences:
text: For a fluid to begin transporting sediment that is currently at rest on a surface, the boundary (or bed) shear stress τ b {\displaystyle \tau _{b}} exerted by the fluid must exceed the critical shear stress τ