§2.4 Coastal formations part 1

• Aardrijkskunde
• Middelbare school
• vmbo, mavo, havo, vwo
• Leerjaar 1-6

§2.4 Coastal formations part 1

Program of the lesson

• Opening, homework and check
  
• Discuss assignment
  
• Photo and goals
  
• New notes
  
• Let's get to work!
  

Homework check

Discuss assignment

Questions?

Photo for the opening

What do you see?
Where does this occur?
Why does this occur here?
Is this desirable?
Does this occur like this everywhere?

Beschrijving van de openingsfoto

Cliffs of Moher

Kustgebieden veranderen voortdurend. Door de kracht van de golven en de getijden worden kusten afgebroken en sediment verplaatst. Op de plekken waar het sediment wordt afgezet, groeit de kust juist weer aan.

Goals

At the end of the lesson you can:

(9) the differences between accretion and degradation coasts
      describe;

The Dutch coast

The sea gives and takes

Waves and tides break up our coast and regrow in other places

Waves

Waves = are ripples in a body of water usually caused by wind blowing across the surface.

The height and force of a wave depend on three factors:

• the force of the wind. 
• the length of time the wind blows. 
• the distance travelled by the waves is important. 

The sea destroys

Breakers = Waves that break in shallow water along the coast.

Once past the breakers, the water flows onto the beach. The force of the backwash determines whether a coast is built up or broken down. 

A strong backwash destroys the coast

The sea destroys

The sea destroys

abrasion coast: Coast where the waves take away more material than they leave behind.

With a abrasion coast strong backwash takes a lot of material back into the sea

Abrasion coast/Cliffed coast

• A cliffed coast is made up of hard and soft rock
• Wave collides with coast
• Soft rock erodes away faster than hard rock
  
• The hard rock remains jutting out to sea
• Waves undermine the foot of the cliff --> holes and sea caves
• After a while, the overhanging hard rock breaks off, crumbles and falls, and the coast recedes
• Eat, sleep, erode, repeat
  

Winter storms

Due to low-pressure areas over the ocean, Ireland, UK and sometimes NL experience severe storms.

This causes rapid coastal erosion

Let's get to work!

Make §2.4 assignment 1, 2, 3 and 4

Afsluitende foto

Wat zie je?

Waar komt het voor?

Waarom komt dit hier voor?

Is dit gewenst?

Komt dit overal zo voor? 

Beschrijving van de afsluitende foto

Holiday chalets abandoned due to coastal erosion wait to be demolished or taken by the sea in the village of Withernsea in the East Riding of Yorkshire. Photograph: Christopher Furlong/Getty Images

https://www.theguardian.com/environment/2020/jan/19/treat-coastal-erosion-as-natural-catastrophe-uk-ministers-urged-east-yorkshire