chapter 10

beach joggers prefer to run on the _____.

beach face

Which of the following structures are types of coastal stabilization structures?

breakers groins jetties

how do jetties protect harbor entrances?

by inhibiting the deposition of sand in the harbor mouth

What is the most obvious difference between summertime and wintertime beaches?

during summertime, there is much more sand on the beach.

The "river of sand" described in our text refers to ____.

longshore transport between the beach and breaker line

In which direction does the longshore current move?

parallel to shore

Why does the beach shown in the video look the way that it does during summertime?

small waves move sand up the beach face and create a wide, sandy beach

Why are coastal stabilization structures built along coastlines?

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

Barrier islands are offshore islands made of sand deposited parallel to the shoreline creating a protective barrier for the coastline. (true/false)

true

What is true about longshore transport (longshore drift)?

Longshore transport moves sediment upcoast or downcoast along the beach. Longshore transport can change direction depending on which direction the waves approach the beach. Longshore transport moves sediment in a zigzag path.

What would you do to both grow a large beach and protect a harbor mouth?

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

What would you expect to find on a summertime beach?

a wide, sandy berm

longshore drift is a current that transports sand in a circular motion in the water column. (true/false)

false

what flows parallel to shore within surf zone?

longshore current

Normally, beaches have the greatest amount of sand on the berm near the end of __________.

summer