Coastal Defense Strategies and Concepts

The video tutorial by Dan from JBA Trust explores the use of physical models, specifically a wave tank, to study coastal and flood risk management. It demonstrates how waves interact with coastal structures and the impact of various defenses like vertical walls, recurve walls, and rock armor. The tutorial emphasizes the importance of designing future-proof defenses considering erosion and changing beach conditions. It also discusses the cost-benefit analysis of different solutions, including offshore breakwaters, to mitigate wave overtopping and protect coastal communities.

What is the primary purpose of the JBA Trust wave tank?

• To predict offshore wave sizes

• To demonstrate wave processes and coastal defenses

• To measure wind speeds over oceans

• To simulate inland flooding scenarios

What happens to waves during a storm surge at the beach?

• They remain unchanged

• They can overtop dunes and cause flooding

• They become smaller and less powerful

• They dissipate completely

How effective is a vertical wall in preventing wave overtopping?

• It increases wave energy

• It reduces overtopping but does not eliminate it

• It completely stops all waves

• It has no effect on waves

What is a common misconception about slope revetments?

• They are easy to construct

• They can worsen wave overtopping

• They always improve wave energy dissipation

• They are the most cost-effective solution

What is the advantage of using a recurved wall?

• It requires no maintenance

• It is taller than other structures

• It is the cheapest option available

• It captures and redirects wave energy back to the sea

How does rock armor help in coastal defense?

• It reflects wave energy back to the sea

• It absorbs wave energy through multiple interactions

• It increases wave height

• It prevents wave formation

What is a drawback of using rock armor?

• It is very expensive

• It covers the beach and can lead to oyster growth

• It is ineffective against large waves

• It requires frequent replacement

What is a benefit of using offshore breakwaters?

• They are the cheapest option available

• They prevent wave overtopping while preserving the beach

• They completely block all wave energy

• They are invisible from the shore

Why might offshore breakwaters be considered over other defenses?

• They require no maintenance

• They offer effective protection with minimal visual impact

• They have no environmental impact

• They are easy to construct

What is a key consideration when choosing a coastal defense strategy?

• The height of the waves

• The color of the materials used

• The potential for oyster growth

• The balance between cost and effectiveness