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Mangawhai- Pakiri coastline - Coggle Diagram
Mangawhai- Pakiri coastline
Economic development
1/3 of the population live iin auckland
35% of global bdp is in auckland
Auckland is growing rapidly
location
north of auckland
north earsternly facing coasltine
key facts
outputs are 5x inputs
sand extraction
during 1994 to 2004, 165,000m3/ year
2005 onwards, 75,000 m3/year
no rivers or constructive waves so beaches are becoming flatter
rising sea levels , high energy waves, eroding sand dunes, expected to be about 35m by 2100
lot more than other nearby coastlines
non renewable, closed system
Outputs
mangawhai spit
sediment
sand dunes (undercut and eroding)
nearshore bars (getting mined to becoming smaller)
processes
Mass movement
(slumps)
Longshore drift, (north) Pakiri to mangawhai
erosion , 35m between now and 2100
Inputs
Managwhai river sediment
wave energy
storms
rising sea levels
wind speed
sand mining
Offshore sand form holocene