Chapter 10 Beaches, Shorelines, Coast
Which way would sediment move if NO beach drift existed?
At an angel to shore
What type of feature is a barrier island?
Depositional
What is the most obvious difference between summertime and wintertime beaches?
During summertime, there is much more sand on the beach.
In which area(s) of a barrier island is peat formed? - Two answers
High salt marsh and Low salt marsh
Why does the beach in the video look the way that it does during wintertime?
Large waves move sand offshore onto longshore sand bars and create a rocky beach
Which of the following processes is responsible for the movement of sand down the beach?
Longshore transport
In the long term, What do beach drift and longshore current do?
Move sediment parallel to the shoreline
When there is longshore drift, the overall direction of sand transport is __ to the coast
Parallel
In order to produce longshore drift the direction of waves must not be ___ to the coast
Perpendicular
Which of the following beach compartment-to-submarine canyon affiliation is incorrect?
Redondo : Mugu
Which of the following is/are part of a beach compartment?
River Beach Submarine Canyon
Landforms associated with longshore drift from where the ___ is plentiful enough to create them
Sediment
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.
What process formed the submarine canyons off the Southern California coast?
Some were carved out by rivers when sea level was lower than it is at present, but most form from the erosive action of turbidity currents
What are submarine canyons?
Steep-sided valleys cut into the continental slope
What happens to a barrier island as sea level rises? - Two Answers
Structures on the island are at risk due to increased erosion. and Peat deposits are exposed on the ocean beach side of the barrier island.
Normally, beaches have the greatest amount of sand on the berm near the end of___
Summer
Where are barrier islands common? -two answers
The Gulf coast of the United States and East coast of the United States
What is the longshore current
Water forced by waves to move along the shore
How is a cave created in a cliff face along a sea coast?
Wave action erodes areas of weakness in rock in a sea cliff
How is an arch formed along a sea coast?
An arch forms when a sea cave breaks though a headland or where two sea caves coalesce as they erode back due to wave action
How does a sea stack form?
A stack forms when a sea arch collapses leaving a vertical column of rock offshore.
In which area of a barrier island would you expect to find a woodland or forest?
Barrier Flat
A ___ forms when a longshore drift creates a ridge of sand separating a waterway from the ocean
Baymouth Bar
How does the tide cycle affect erosion along a sea coast?
The tide cycle causes erosion to occur at different elevations along a sea coast
Waves hitting at an angle and then bending around features of the coast is known as
Wave refraction
