(TD) Oscillatory Motion Flashcards

1
Q

What is the definition of “Oscillatory Motion”?

A

No net sideways motion in a simple wave

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2
Q

What is wave height and energy determined by?

A

Strength of the wind and the fetch

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3
Q

What is the “Fetch”?

A

Expanse of water over which the wind is blown

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4
Q

What is the “Wave Base”?

A

The depth at which the circular cells created by oscillatory motion dies out

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5
Q

How do wave ripples relate to the wave base?

A

In shallow water, the wave base would be below the bed, thus energy is transferred into creating lateral movement along the bed

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6
Q

What do low energy wave ripples look like?

A

Rolling grain ripples - broad troughs and sharp crests

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7
Q

What do high energy wave ripples look like?

A

Vortex ripples - small clouds of grains swept from troughs to peaks - fall out of suspension

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8
Q

What is another name for a low energy wave ripple?

A

Rolling grain ripples

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9
Q

What is another name for a high energy wave ripple?

A

Vortex ripples

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10
Q

What are the three variable characteristics of wave ripples?

A

Straight/Sinuous crests, Laminae in both directions, Overlap

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11
Q

What is the principle grain size wave ripples form in?

A

Coarse silts to sands

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12
Q

Wave ripples can form in any ___ sediment

A

Non-cohesive

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13
Q

What wavelength would be expected in gravel ripples?

A

Several m

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14
Q

What crest height would be expected in gravel ripples?

A

10’s cm

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15
Q

What are the two primary differences between the formation of current and wave ripples?

A

Current ripples = any depth, wave ripples = limited to shallow depths AND current ripples = generall curved crests, wave ripples = generall straight to sinuous crests

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