COMPONENTS OF THE ENVIRONMENT
MURIWAI BEACH AS A SYSTEM
The elements, processes and features of an
environment do not exist alone.
They are all connected in some way in a
series of inputs, processes, outputs and
feedback which links back to the beginning
For this reason, we can identify the beach as
SYSTEM DIAGRAM PG 38
INPUTS PROCESSES OUTPUTS
SYSTEM DIAGRAM PG 38
• Rock type
• Wave erosion
• Aeolian action
• Wave cut platform
• Changed topography of land
As all are connected any change in an any
one factor will change the rest of the beach
system over time.
What changes could happen at Muriwai if the
prevailing wind was to change to the east?
EASTERLY WIND EFFECTS
LSD wouldn’t occur as readily
Waves would be lower energy, less wave
Sand will blow off sand dunes, more
Saltation wouldn’t occur as frequently,
possible decrease in heights of dunes over
INTERACTION AT MURIWAI PG 39
Interaction at Level 3 is defined as how the
components (wind, waves, rock etc) affect
Interaction can take place at different scales
(small vs big) and with vary degrees of
FOR EXAMPLE WAVES ROCK
The energy of a wave erodes the rock over
The type of rock can reflect waves and
dissipate (break down) the energy of waves
NOW YOU TRY…..
In the space on page 38, write sentences to
explain how VEGETATION and SEDIMENT
Vegetation creates areas of zero wind
velocity at their roots so sediment is
Sediment type and amount determines the
type of vegetation that is able to grow
At the bottom of page 39, draw a diagram
that shows the interaction of different
processes in your geographic environment
What processes operate at Muriwai?
Can you group these together?
What is the best way to show an interaction in a
Are some interactions between processes more
important or obvious than others?
INTERACTION OF PROCESSES PG 40
Often what is produced (the output) from one
process working is what provides the input for
another process to work.
WAVE EROSION AEOLIAN ACTION
Wave erosion produces some of the sediment at Muriwai
that is available for saltation. Without wave erosion the
amount of sediment would be reduced. At the same time,
saltation removes the sediment when it blows onshore
away from the influence of the waves. This means that
the waves cannot pick up the sediment and use it for the
process of corrosion on Otakamiro Headland.
SALTATION LONGSHORE DRIFT
Now you do one in the space provided on
page 40 for how the processes of saltation
and longshore drift impact one another.
Remember, this means you need to say how
saltation affects LSD AND how LSD affects
Bonus marks if you can provide 4 relevant
pieces of specific information from the
Muriwai environment in your paragraph