Please enable JavaScript.
Coggle requires JavaScript to display documents.
Nile Delta - Coggle Diagram
Nile Delta
Coastal Landforms
North westly wind leads to eastward movement of water and sediment
Surface current velocity ranges from 4.46 cm/s to 23.14 cm/s
Waves come from west and northwest majority of the time
Lots of underwater sand bars
Tideless sea
Beaches west of Abu Qir contain long crescentic bar systems
Crescentic bars formed by rip currents
To the east Abu Qir parallel longshore exist along the delta
Parallel bars formed by eastward current and longshore drift
Location & Background
Nile is 6650 km
Catchment area of 3 million km squared
Discharge less than 3000 m cubed/s
River carries huge sediment load
Clay silt and sand
average sediment yield is 4.26 t/ha/year
loss of homes due to flooding
increase in population
Physical factors & processes
3 zones of delta can be identified
Foreshore
elongated ridges
lagoons
salt marshes
lagoons get filed with sediment
Sandy
dunes
sand sheets
Frontal
south of foreshore
eroded limestone outcrops
split into distributaries more than 160km inland
Aswan High Dam constructed in 1964 to prevent flooding
Farmers needed to adapt crops
Sea levels rising
Could flood and trigger food shortages
How and why the landscape changes over time
low energy environment
aswan dam created an imbalance has been created between erosion and accretion
rapid reduction in the amount of sediment accreted
rising sea level causes higher erosion