Meandering and Braided River Channels

The video explores stream erosion and deposition, focusing on meandering and braided channels. It uses the Willamette River as a case study to illustrate these concepts, examining its historical and current channel types. The video also explains how topographic maps can reveal river flow directions and the formation of meanders and terraces. Finally, it discusses the Mississippi River's meandering nature and the creation of oxbow lakes.

What is the primary difference between meandering and braided channels?

• Meandering channels have a single winding path.

• Braided channels are found in areas with a steep gradient.

• Meandering channels have multiple interconnected paths.

• Braided channels are found in areas with fine sediment.

What causes a meandering channel to form?

• A steep gradient and coarse sediment load.

• A flat gradient and fine sediment load.

• A variable discharge and coarse sediment load.

• A steep gradient and fine sediment load.

Which of the following is a characteristic of a braided channel?

• Single, winding path.

• Fine sediment load.

• Multiple interconnected channels.

• Stable discharge throughout the year.

What historical event contributed to the braided characteristics of the Willamette River?

• A major flood event.

• The ice age and glacial activity.

• A significant earthquake.

• A volcanic eruption.

How do river terraces form?

• Due to changes in river discharge or sediment load.

• Through the deposition of fine sediment.

• By the erosion of steep cliffs.

• From the accumulation of organic material.

What feature is indicated by closely spaced contours on a topographic map?

• A steep slope or terrace.

• A flat floodplain.

• A meandering channel.

• A braided channel.

What is an oxbow lake?

• A lake formed by volcanic activity.

• A lake created by a dam.

• A lake formed in a glacial valley.

• A cut-off meander loop.

How do meander scars form?

• Through the accumulation of organic material.

• By the migration of meander loops.

• Through the erosion of river banks.

• By the deposition of sediment during floods.

What happens to a river channel when adjacent meanders erode into each other?

• The river forms a terrace.

• The river creates a braided channel.

• The river abandons the meander loop.

• The river forms a new meander loop.

What is the primary cause of sediment deposition along channel banks during floods?

• Decreased water velocity.

• Increased water velocity.

• High sediment load.

• Low sediment load.