18- streams

Question 1

Stream network order

Answer 1

Streams within the network are assigned a rank according to size or position within the network - smallest stream = first order , when 2 first order streams join = second order

Question 2

Stream channel types - 2 types

Answer 2

Bedrock channels - water flows over the local bedrock , bedrock channels are fixed in position for long periods of time

Alluvial channels - water flows through unconsolidated sediment particles that can be eroded, transported and deposited by the flow

Question 3

Stream Channel patterns

Answer 3

types of sedimentary deposits formed by streams and rivers .
3 types - originally straight, meandering and braiding

although terms like anabranching,anastomosed and wandering are also used

Question 4

factors influencing stream channel pattern - 4 factors

Answer 4

slope, discharge, sediment supply, sediment size

Question 5

3 stages of Sediment transport

Answer 5

3 stages of sediment transport : entrainment, transport, deposition

Question 6

entrainment

Answer 6

release of sediment a result of erosion which leads to sediment transport, influenced by particle size, shear stress and slope

Question 7

3 modes of sediment transport

Answer 7

Suspended sediment - fine particles that are carried continuously in the water column

bed load - coarse grains that are transported along the bed by rolling +
sliding traction and saluting bouncing

solution - dissolved minerals carried in solution

Question 8

floodplains

Answer 8

flat low lying area on either side of a stream channel that will be inundated when the stream floods

Question 9

floodplains features

Answer 9

oxbow lakes, meander lakes, bluffs, levees, terraces