Whitely Physical Geography Flashcards
Prerequisites for the formation of a Delta
5 of them.
Shallow offshore gradient - a continental shelf.
Sheltered - Inputs exceeded outputs prior to the Aswan Dam.
Low tidal range - Mediterranean micro-tidal.
Ample sediment supply - Nile flood ( snowmelt and summer rains in the Ethiopian Highlands - Blue Nile and Atbara).
Fluvial, marine and Aeolian process.
As the river slows …… material gets deposited.
………. deposits near the sea.
Finer for both answers
What is flocculation?
Clumping of clay particles; heavy enough to be deposited. Only happens in sea water as salt facilities it.
Therefore must be nearer the mouth of the river with tides to occur.
When the channels break into distributaries it reduces the ……. ………
Each distributary is ….., efficient than the main channel there is therefore ……… deposition and positive feedback.
Reduced hydraulic radius.
Each distributary is less efficient.
More deposition.
Crevasse Splays - If a stream ……… out of its channel by breaking it’s ………. , the flow of a stream can be diverted out of the channel and into the adjacent flood plain.
Avulsed
Levee
At the Nile Delta ……. ……. is the dominant wind direction .
There is therefore longshore drift from …….. .. …….
North West
LSD from West to East
In the winter the Polar front migrates ………… Causing mid-latitude depressions over head leading to ……. waves therefore increasing ………. movement form Delta.
Polar front migrates southwards
Storm waves
Increased offshore movement from Delta
……..-……..(direction) Mediterranean Gyre
Anti clockwise
What are the names of the two distributaries and cuspate promontories.
Rosetta and Damietto
What r the names of the lagoons?
Idku, Burullus, Manzala
The Aswan Dam dam was buit in …….
1964
The primary locus of erosion is at the ……… …..
…
Rosetta Promontory
Low rainfall figures results in ………… vegitation due to lack of precipitation.
This leads to more ……… dunes due to sand not tied down by vegetation.
Sparse vegetation.
More mobile dunes.
