|
Home > Preview
The flashcards below were created by user
green29dive5
on FreezingBlue Flashcards.
-
Beach
the entire active area of the coast that experiences changes due to breaking waves
-
-
Where does wave energy converge?
on headlands
-
where does wave energy diverge?
away from adjoining bays
-
Parallel movement
- as waves approach shore, they bend so crests are nearly parallel to shore
- different segments of wave crests move at different speeds
-
Zig zag motion
long shore current
-
long shore current
zig zag motion
-
How much can the long shore current speed up to?
4 km/hr
-
What does the long shore current speed up with?
- beach slope
- wave height
- wave frequency
-
How fast are rip currents
5 mph
-
How big are rip currents
15-150 ft wide
-
What are some features of a depositional coast?
Delta, Spit, Tombolo, Barrier island
-
What are the features of a barrier island?
- beach
- dune
- barrier flat
- salt marsh
- lagoon
-
barrier flat
formed from sand driven through openings during storm
-
Low marsh
extends from ~mean sea level to the high neap-tide line
-
high marsh
extends to highest spring-tide line
-
what si the most biologically productivd
- low marsh
- land building vegitation
-
What 3 external forcing functions shape a delta
- river influence
- wave influence
- tide influence
-
Which one of the 3 external forcing functions shaping a delta forms the most structured delta?
river influence
-
Which 1 of the 3 external forcing functions shaping a delta forms the least structured delta?
tide influence
-
What determines the final shape of the delta?
the balance of all three factors
-
What is the dominating external forcing function of the Mississippi river Delta and how has the delta built the coast line?
- River dominated
- switching delta lobes build coastline
-
estuaries
body of water surrounded partially by land where fresh and ocean water mix
-
What are the geologic classifications of estuaries?
- Drowned River Mouth
- Fjord
- Bar-Built
- Tectonic
-
Drowned river mouth estuary
- river under rising sea level
- ex: Chesapeake Bay
-
Fjord Geological Estuary
glacially eroded, deep with sill at mouth
-
Bar-Built Estuary
- former low stand of sea level
- low angle coastlines
- EX: NC, Florida, Gulf Coast
-
Tectonic estuaries
- active plate margins
- ex: San Francisco Bay
-
Chemical Characteristics of estuaries
amount of mixing between freshwater and salt water
-
The chemical characteristics of estuaries are determined by:
- shape of estuary
- volume of river flow at head
- tidal range at the mouth
-
What are chemical categories of estuaries categorized by?
circulation patterns
-
What are the chemical categories of estuaries?
- salt wedge
- well-mixed
- fjord
- reverse
-
Which chemical category of estuaries is becoming more common?
reverse
|
|
Get the free mobile app
Take the Quiz
Learn more
Learn more