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Mixing and Transport Processes > Fragen > Flashcards

Fragen Flashcards

1
Q

There is always more bedload sediment transport than suspended sediment transport? True or False?

A

False

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2
Q

Mixing and transport processes only occur in river flows? True or False?

A

False

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3
Q

Disperion is…

negligible as compared to turbulent diffusion (in river flows)
enhanced mixing induced be the temporal structure of the flow
enhanced mixing induced by the spatial structure of the flow

A

3.

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4
Q

What ids the typical uncertainty/inaccuracy of sediment transport predictions?

A

> 100 %

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5
Q

The transverse velocity distribution contributes mor to mixing than the vertical one in shallow rivers. Ture or False?

A

True

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6
Q

Advection

Advection is the transport of a substance by the motion of that fluid.
Advection is driven by a gradient in concentration
Advection is the mixing of a substance by bulk motion
Advection is a process which only occurs in stagnant substances

A

1.

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7
Q

Which of the following processes are considered in the Streeter Phelps model?

…

A

Biochemical oxygenation
Advection
Re-oxygeneation by gas transfer across the water surface

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8
Q

The maximum concentration of oxygen that can be dissolved in the water…

depends on the temperature and the salinity
depends on the temperature only
increases with temperature and salinity

A

1.

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9
Q

Dispersion is a process that neds to be modelled in a Reynold’s-averaged 3-D approach. True or False=

A

False

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10
Q

Turbulent diffusivities…

mainly depend on temperature
vary in time and space
are determined by the turbulance
are independent od the fluid motion
are a scalar quantity

A

2.
3.

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11
Q

Molecular diffusivities….

mailny depend on temperature
are a scalar quantity
are independent of the fluid motion
vary in time and space
are determined by the turbulence

A

1.
2.
3.

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12
Q

Diffusion

Diffusion is the net movement from a region of higher concentration to a region of lower concentration
Diffusion is driven by a gradient in concentration
Diffusion is a process which only occurs in stagnant substances
Diffusion is the mixing of a substance by bulk motion

A

1.
2.

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13
Q

What is the ohyscal interpretation of the Shield’s number?

a characteristic of the flow
the density ratio
a characteristic of the sediment
the ration of the destabilizing force induced by the flow to the stabilizing force due to the particle weight

A

3.
4.

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14
Q

A depth-averaged 2-D model resolves transverse disperion. True or False?

A

False

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15
Q

The initiation of motion of sediment transport (in a simplified system) depends on the following dominant variables

A

Shield’s number
particle Reynold’number

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16
Q

The settling velocity of a partice of a certain density in water with a certain temperature can be estimated from the particle diameter? True or False?

A

True

Mixing and Transport Processes (2 decks)

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