by Al Trujillo Hard Stabilization Jetties Groins and Breakwaters Jetties Always in pairs built to protect a harbor entrance Groins Individual or many if many groin field built to trap sand ID: 933791
Download Presentation The PPT/PDF document "X. The Coast: Beaches and Shoreline Proc..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
X. The Coast: Beaches and Shoreline Processes (Chapter 10)
byAl Trujillo
Slide2Hard Stabilization: Jetties, Groins, and Breakwaters
Jetties: Always in pairs; built to protect a harbor entrance
Groins
: Individual or many (if many = “groin field”); built to trap sand
Slide3Ex: Groin
A groin has nothing to do with human anatomy…Why is a groin built?So that the beach is wide in front of your house!
Your house
Neighbor’s house
New groin
Slide4Ex: Breakwater
A hard, rocky structure built parallel to shore and attached to the sea floorA few feet above sea levelDesigned to break waves and make quiet water behind
Curved breakwater,
Greece
Slide5Case Study:
Coastal Stabilization StructuresWork together with your Success TeamNeed: Case Study Handout (1 per team)Rules:Closed book (starting now!)Can use your notes
Rank each character’s idea
Put your rankings (#1, #2, #7) on the board
Be prepared to discuss your choices
Slide6Case Study:
Santa Monica, CaliforniaSee Figure in Trujillo and Thurman textbook
After breakwater (1949)
Before breakwater (1931)
Dredge
Breakwater destroyed by waves in 1983
Slide7Case Study:
Santa Monica, CaliforniaVideo: The Beach: A River of Sand (Part II)Shows Santa Barbara Harbor and the problem its shore-connected breakwater createdLook for the Santa Monica breakwater (our Cast Study)
Good
underwater footage of La Jolla Submarine Canyon
Slide8X. The Coast: Beaches and Shoreline Processes (Chapter 10)
byAl Trujillo
End