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GEOS-101 > Rivers and Floods > Flashcards

Rivers and Floods Flashcards

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1
Q 
Steeper gradient (slope)
(Upstream or Downstream?)
A

Upstream

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2
Q 
Gentler gradient (slope)
(Upstream or Downstream?)
A

Downstream

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3
Q

Higher velocity

Upstream or Downstream?

A

Upstream

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4
Q

Lower velocity

Upstream or Downstream?

A

Downstream

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5
Q 
Small discharge (how much water is flowing)
(Upstream or Downstream?)
A

Upstream

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6
Q 
Huge Discharge (how much water is flowing)
(Upstream or Downstream?)
A

Downstream

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7
Q

Rocks and gravel

Upstream or Downstream?

A

Upstream

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8
Q

Sand and Mud

Upstream or Downstream?

A

Downstream

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9
Q

Rivers dump out sediment when they hit a lake or the ocean, forming a muddy bulge or…..

A

Delta

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10
Q

Two extreme shapes of deltas

A

Classic Delta

Birdsfoot Delta

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11
Q

Have very narrow valleys

Fairly straight channels

A

Young Rivers

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12
Q

Extreme young rivers

A

Slot canyons

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13
Q

Normal young rivers

A

V-shaped valley

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14
Q

Rain gets trapped in a narrow valley.

Water level rises and falls quickly.

A

Flash Floods

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15
Q

Moderate valleys

Gently curved channels

A

Mature Rivers

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16
Q

Floodplains can be ____ or _____

A

Narrow or wide

17
Q

Rivers can get dammed by ice
Water level rises and falls slowly
(Mature Rivers)

A

Ice-Jam Floods

18
Q

Very wide flat floodplain

Sinuous (S shaped) or meandering channels

A

Old River

19
Q

S shaped

A

Meandering

20
Q

Build over time and hold back the river until they suddenly break

A

Natural levees

21
Q

Flood risk in Old Rivers

A

Levee-Burst Floods

22
Q

Water level rises quickly but takes a very long time to drain away

A

Levee-Burst Floods

23
Q

When old rivers get uplifted, they keep their shape and they cut down

A

Rejuvenated Rivers

24
Q

Rivers are trapped in crooked narrow canyons

A

Entrenched meanders

25
Q

Narrow valleys cause rejuvenated rivers to also have ________ but they travel a little slower than in straight young rivers

A

Flashfloods

GEOS-101 (36 decks)

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