What are the three main types of marine deltas based on? What are ...

[DelorasTo]

What are the three main types of marine deltas based on? What are they, and how are they different
  from each other? What will be an ideal response?

Question 2

What happens when a stream overflows its banks? What will be an ideal response?

[sierrahalpin]

Answer to Question 1

The three types are based on the relative importance of stream, wave, or tidal processes. Streamdominated
deltas have long fingerlike sand bodies, each deposited in a distributary channel that
progrades far seaward. Wave-dominated deltas have distributary channels, but the seaward margin of
the delta is reworked by waves, so the entire delta progrades. Tide-dominated deltas are continuously
modified into tidal sand bodies that parallel the direction of tidal flow.

Answer to Question 2

During a flood, a channel receives more water than it can accommodate, so it overflows its floodplain.
The stream deposits sediments on the floodplain; sand and gravel or mud are common. When water
pours onto the floodplain, its velocity and depth rapidly decrease. As a result, ridges of sandy
alluvium, natural levees, are deposited along the channel margins, and the mud is carried beyond the
natural levees into the floodplain, where it settles from suspension.