Backwash from the ocean
What is not a source of water in streams?
A. Runoff from surrounding lands
B. Direct rainfall
C. Backwash from the ocean
D. Groundwater discharge
228 m(^3)/s
What is the discharge of a stream with a cross sectional area of 12.0 m (^2) and an average velocity of 19.0 m/s?
1. Dissolved load
2. Suspended load
3. Bed load
Rank the 3 types of sediment load in a stream from smallest to largest
Suspended load
Bed load
Dissolved load
Capactiy
____________ is the amount of sediment that a stream can carry.
Competence
____________ refers to the largest particle size that a stream can carry.
Flooding
Which of the following is NOT a threat to the long-term sustainability of a river?
A. Pollution
B. Flooding
C. Excess water use
D. Urbanization
Canyon
Which of the following is an erosional stream landform?
A. Alluvial fan
B. Point bar
C. Canyon
All of the answers are correct
Which of the following is a depositional stream landform?
A. Alluvial fan
B. Natural levee
C. Point bar
D. All of the answers are correct
Base level
The lowest elevation to which a stream channel can erode is defined as its
A. Competence
B. Base level
C. Stream gradient
D. Longitudinal profile
Saltation
Which of the following is NOT a mechanism of erosion by running water?
A. Scouring
B. Abrasion
C. Breaking & lifting
D. Dissolution
E. Saltation
The volume of water passing a point on the stream bank in a given time.
Which of the following refers to stream discharge?
A. The volume of water passing a point on the stream bank in a given time.
B. The velocity of water passing a point on the stream bank in a given time.
C. The volume of sediment being transported by a stream in a given time.
500 m(^3)/s
If a stream channel has a cross-sectional area of 100m(^2) and the water flows an average of 5 m/s, what is the streams discharge?
A. 500 m/s
B. 500 m(^2)/s
C. 500 m(^3)/s
Runoff
All the water that falls on the landscape and eventually ends up in streams is called:
A. Sheetwash
B. Runoff
C. Watershed
D. Groundwater
Drainage network
An array of interconnected streams on the landscape is called...
A. Tributaries
B. Trunk streams
C. Drainage network
TRUE
Since it's unrealistic to build levees & reservoirs that could prevent all conceivable floods, it's sensible to allow some floodplains to revert to wetlands and to create floodways where flooding damage would be minimal.
TRUE or FALSE
FALSE
The capacity of a stream or river is the amount of water it carries (discharges).
TRUE or FALSE
TRUE
The jet stream was a key contributing factor to Mississippi Rive flooding in 1993 because it trapped warm, moist Gulf of Mexico air over the central United States.
TRUE or FALSE
TRUE
Plate tectonics events can produce mountains whose uplift can cause drainage reversal in existing river systems.
TRUE or FALSE
Amazon
The river with the greatest discharge in the world is the
A. Mississippi
B. Nile
C. Ob
D. Amazon
suspended load
Identify the FALSE statement. Streams cause erosion by
A. suspended load
B. scouring
C. breaking & lifting
D. abrasion
alluvial fans
Streams come down out of steep areas onto much flatter land, lose velocity, and drop material in wedge-shaped structures called
A. point banks
B. alluvial fans
C. levees
D. deltas
narrow, deep valleys
Fluvial landscapes that are early in their evolutionary progression have
A. broad floodplains
B. narrow, deep valleys
C. natural levees
D. oxbox lakes
6000 ft(^3)/s
The 100 feet wide and 10 feet deep river flows at an average velocity of 6 ft/s. Its discharge is:
A. 4,800 ft(^3)/s
B. 240 ft(^3)/s
C. 6000 ft(^3)/s
D. 660 ft(^3)/s
developed its shape b/c the ocean current there was stronger than the river current
Which statement is FALSE?
The Mississippi River Delta
A. consists of several distinct lobes
B. is the product of several avulsions
C. developed its shape b/c the ocean current there was stronger than the river current
D. is a bird's-foot delta
E. is the site of the city of New Orleans
make poor farmland...
Which of the following statements is FALSE? Deltas
A. may form where a stream empties into the quiet waters of a lake or the ocean
B. are likely to slowly sink and become swampland called a delta plain
C. make poor farmland b/c they flood regularly and flooding leaches out the minerals