X. The Coast: Beaches and Shoreline Processes (Chapter 10)

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Presentation transcript:

X. The Coast: Beaches and Shoreline Processes (Chapter 10) 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

Ex: 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

Curved breakwater, Greece Ex: Breakwater A hard, rocky structure built parallel to shore and attached to the sea floor A few feet above sea level Designed to break waves and make quiet water behind Curved breakwater, Greece

Case Study: Coastal Stabilization Structures Work together with your Success Team Need: 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

Case Study: Santa Monica, California See Figure in Trujillo and Thurman textbook Dredge Breakwater destroyed by waves in 1983 Before breakwater (1931) After breakwater (1949)

Case Study: Santa Monica, California Video: The Beach: A River of Sand (Part II) Shows Santa Barbara Harbor and the problem its shore-connected breakwater created Look for the Santa Monica breakwater (our Cast Study) Good underwater footage of La Jolla Submarine Canyon

X. The Coast: Beaches and Shoreline Processes (Chapter 10) by Al Trujillo End