Warm-up Week 4 The vertical distance between trough and crest is called the ____. a. wave height c. fetch b. wavelength d. wave period A fetch is _________. a. a method of shoreline erosion b. a type of wave-cut platform c. the distance that wind travels across open water d. the circular pattern made by water particles when a wave passes A ____________ tidal pattern has two high tides and two low tides each day. a. semidiurnal c. diurnal b. bidiurnal d. mixed

“Shoreline Processes”

What is a “Beach” anyways?! Accumulation of sediment near water

Do Beaches Change? Forces change beaches! Push/Pull or waves & currents This creates shoreline features.

Forces that change Beaches. Abrasion Grinding of moving sediments “Sand-papering” Refraction Bending of waves Where sediment is deposited Longshore Transport Sideways shore currents Erosion = movement

2 Types of Shoreline Features Erosional Features Created by moving sediment away Depositional Features Created by leaving a pile of sediment

Erosional Features. Wave-Cut Cliff Platform Sea Arch Sea Stack Flat cliff along water Platform Benchlike surface along cliff Sea Arch 2 caves join Sea Stack Arch falls down

Depositional Features. Spit Long “finger” of sand Hook at end (usually) Bar Shallow area Sand peaks out of water Tombolo Connects island to mainland