Coastal Defense Strategies and Impacts

Dan from JBA introduces physical models used for coastal and flood risk management, focusing on a wave tank. The video demonstrates various coastal defenses, including vertical walls, slope revetments, recurve walls, rock armor, and nearshore breakwaters. Each defense's effectiveness is tested by simulating wave impacts, highlighting their strengths and weaknesses in managing wave energy and preventing flooding.

What is the primary purpose of the JBA Trust physical models?

• To predict weather patterns

• To build coastal structures

• To train and educate in coastal and flood risk management

• To entertain students

Why is a wave tank used in coastal environments?

• Because it is cheaper than other methods

• Because analytical equations are always sufficient

• Because coastal environments are complex and can't always be solved analytically

• Because it is the only method available

What happens when waves break on a beach without any defenses?

• They roll up and down the beach face

• They cause no issues

• They flood the entire coastline

• They disappear completely

What is the main drawback of using a vertical wall as a defense?

• It is difficult to construct

• It allows some wave overtopping

• It is not visible

• It is too expensive

What was the unexpected result of using a slope revetment?

• It was too expensive to implement

• It had no effect on wave overtopping

• It made wave overtopping worse

• It completely stopped wave overtopping

How does a recurve wall improve coastal defense?

• By being taller than other structures

• By capturing and redirecting wave energy back to sea

• By being invisible

• By being cheaper to build

What is a key advantage of rock armor as a coastal defense?

• It is very expensive

• It absorbs wave energy effectively

• It is invisible

• It requires no maintenance

What is a disadvantage of using rock armor?

• It is too expensive

• It covers up the beach and can lead to oyster growth

• It is not effective

• It is difficult to install

What is the purpose of a submerged breakwater?

• To increase wave energy

• To stop wave energy before it hits the defense

• To completely block all waves

• To make the beach unsightly

What is a potential downside of building a high breakwater?

• It is very expensive and unsightly

• It is easy to construct

• It is invisible

• It does not stop any waves