Ocean Chapter 10

Move sediment parallel to shoreline

Water forced by waves to move along the shore

At an angle to shore

Beaches tend to have a narrow berm and a prominent longshore bar.

Winter waves are short and high, whereas summer waves are long and shallower.

Beaches tend to have a wide berm and no longshore bar

A few weeks

The wintertime beach would look similar to the summertime beach.

-to protect coastal property from wave erosion -to stop beach sand erosion

Parallel to shore

jetties groins breakwaters

by inhibiting the deposition of sand in the harbor mouth

Place two jetties on either side of the harbor mouth, and build a breakwater upcurrent from the harbor mouth.

structures built to protect a coast from erosion or to prevent the movement of sand along a beach

built perpendicular to a coastline and are specifically designed to trap sand moving along the ocast in longshore transport -large blocks of rocky material (rip-rap)

built perpendicular to the shore and is usually constructed of rip-rap -usually built in closely spaced pairs and can be quite long, they can cause more pronounced upcoast depositon and downcoast erosion -protect harbor entrances from waves and only secondarily does it trap sand

built parallel to a shoreline -harbor

one of the most destructive type -built parallel to shore -armors coastline and protects landward developments from ocean waves