GS25210- Catchment Systems
Assessment
25% hydraulic flume report
15/12/21
Short answer data response
75% AILOE
Jan 2022
Reading Notes
Knighton, D. (1998) Fluvial forms and processes a new perspective . Rev. and update ed.
London ;: Arnold. P1-8
Overpopulation most serious problem for world
o Problems with: water supply, navigation, power supply
Less than 0.005% of continental water stored in rivers
Rivers provide many resources for humans
Can also cause a threat
Rivers have political and economic relevance
River forces very potent
o Carry 19 mil tonnes of material a year
o 80/20 solid/liquid
River defined as an open system
Geology of a river basin defines constraints of nature and fluvial activity
Human controls are more intense
o 36000 damns worldwide and 200 large damns completed each year
o Deforestation has massive impacts
o “Drain of earth’s surface”
Large shifts of in climate over 20k years have caused change in fluvial activity
Global warming predictions:
o Increased sea levels and rainfall
o Increase in channel instability
o Arid zone rivers more susceptible to change as a result ^
o Boundary sediment changes to finer grain material
Time frames affect conception of equilibrium
o Schumm and Lichty (1965)
Triparite division into cyclic, graded and steady times
Periods of 104+ , 10^2 and 10^0
o Form processes are a massive consideration
o
Regime theory developed by anglo-indian engineers
o For construction of stable irrigation channels
W.M. Davis’as cycle of erosion
Assessment
25% hydraulic flume report
15/12/21
Short answer data response
75% AILOE
Jan 2022
Reading Notes
Knighton, D. (1998) Fluvial forms and processes a new perspective . Rev. and update ed.
London ;: Arnold. P1-8
Overpopulation most serious problem for world
o Problems with: water supply, navigation, power supply
Less than 0.005% of continental water stored in rivers
Rivers provide many resources for humans
Can also cause a threat
Rivers have political and economic relevance
River forces very potent
o Carry 19 mil tonnes of material a year
o 80/20 solid/liquid
River defined as an open system
Geology of a river basin defines constraints of nature and fluvial activity
Human controls are more intense
o 36000 damns worldwide and 200 large damns completed each year
o Deforestation has massive impacts
o “Drain of earth’s surface”
Large shifts of in climate over 20k years have caused change in fluvial activity
Global warming predictions:
o Increased sea levels and rainfall
o Increase in channel instability
o Arid zone rivers more susceptible to change as a result ^
o Boundary sediment changes to finer grain material
Time frames affect conception of equilibrium
o Schumm and Lichty (1965)
Triparite division into cyclic, graded and steady times
Periods of 104+ , 10^2 and 10^0
o Form processes are a massive consideration
o
Regime theory developed by anglo-indian engineers
o For construction of stable irrigation channels
W.M. Davis’as cycle of erosion
