MEANDERING STREAMS

Question 1

most stable and efficient channel geometry formed and maintained by erosion of banks and deposition of point bars

Answer 1

meandering streams

Question 2

• quantitative measurement of the style of meandering
• measures deviation of a path between two points from the shortest possible path

Answer 2

sinuosity index

Question 3

• develops from the outside of the meander bending towards the inner side of the bend
• erodes sediments from outside bend and deposits point bars on the inside bend

Answer 3

helical flow pattern

Question 4

the rapid abandonment of a river channel and the formation of a new river channel

Answer 4

avulsion

Question 5

• has a single channel of low sinuosity and high gradient
• high sediment load
• channel is inundated at maximum discharge
• thalwegs and bars appear in times of low discharge
• areas w/ highly irregular water regime and abundant sediment supply

Answer 5

braided streams

Question 6

• low sinuosity index
• lacks typical features of meandering rivers

Answer 6

straight streams

Question 7

• multiple channels that are laterally stable
• consists of channels that can be braided, meandering, or straight

Answer 7

anastomosing streams

Question 8

occurs when the slope adjusts to the required velocity for transportation of load

Answer 8

graded streams

Question 9

profile where sediments are removed by erosion

Answer 9

degradation

Question 10

occurs when profile is filled by deposited sediments

Answer 10

aggradation

Question 11

lowering of base level when there is an increase in gravitational potential energy

Answer 11

rejuvenation

Question 12

• isostatic change
• land rises due to faulting and river begins active downward erosion

Answer 12

dynamic rejuvenation

Question 13

rejuvenation from global sea level changes

Answer 13

eustatic rejuvenation

Question 14

rejuvenation due to decrease load or increase run-off

Answer 14

static rejuvenation