Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Waves
What are constructive and destructive waves?
Why?
They cause different
landforms along the coast
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Waves
What are constructive and destructive waves?
Introduction
Wave gallery
Beat the teacher:
2 wave types
Mix-match
Most-likely / least likely
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Constructive and
Destructive waves
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Storm waves
Durban
Extremely
long fetch
South
Africa
Date: 9-Apr-15
Mexican waves
Aim – What are constructive and destructive waves?
Date: 9-Apr-15
Royal wave
Aim – What are constructive and destructive waves?
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
1.
Circular orbit in open water
2.
Wave becomes more elliptical in movement
3.
Friction slows down base of wave
4.
Water from previous wave returns as backwash
5.
Shelving sea bed (beach)
6.
Water rushes up the beach as swash
7.
Increasingly elliptical orbit
8.
Top of wave moves faster
9.
Wave begins to break
10.
Formation of a wave
Can you
match these
labels with the
stars on the
diagram?
Animation – Wave
2 types
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Most likely to…
Destructive
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Most
Most
Most
Most
Most
Most
Most
Most
Most
Most
likely
likely
likely
likely
likely
likely
likely
likely
likely
likely
to
to
to
to
to
to
to
to
to
to
Constructive
have a strong swash
have a strong backswash
be tall
have a long wavelength
occur in winter
be a steep wave
be powerful
build up a beach
be slow moving waves
be a longer time between each wave
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Beat the teacher
Constructive waves are sometimes known as surfing waves
and mainly occur in summer. They help to build beaches up
with their strong backwash. They move fast unlike
destructive waves. Destructive waves are small, steep waves
that are mainly found in winter, during stormier conditions.
They have a strong swash and remove beach material.
Destructive waves have a long wave period unlike
constructive waves.
Date: 9-Apr-15
Aim – What are constructive and destructive waves?
Homework
• For a set number of places around the
coast, work out the fetch and whether
you’re likely to get constructive or
destructive waves