13. River restoration Flashcards
the three zones of a fluvial river (from the top down) and what type of cross section
headwaters-v shaped, waterfalls etc
transfer zone-gentler slopes, valley broadens
deposition zone river wanders and meanders-many seperat channels
4 watershed drainage patterns
parallel
rectangular
radial
contorted
stream ordering, 1-10
1- first order, hgih flow rate, large particle
2-10 work your way down
restoring physical habitat cannot restore
biological integrity if there are water quality constraints
what are 6 restoration activities
less land disruption limit impervious surface area restore riparian vege restore wetlands stabilize channel create drop structures
what can be used to increase ph
limestone
shells
habitat definition
spatial structure of environemnyt which alows species to live, reproduce etc
6 habitat relating ecosystem functions
1 habitat
2 barrier -stopage of materials energy etc
3 conduit- ability of system to transport materials etc
4 filter-slective penetration of materials energy etc
5 source- output exceeds input
6 sink - input exceeds output
draw landsczapes with high and low connectivity
ok
draw wide to no vegetation bufffer and what does it do
filters stuff
although channel forming design flow is important
have to consider other flows and their impact on ecology
two sides of a meandering river called and the bit where it corsse over
cutbank
point bar
crossover
how to avoid bank failure
wire secured to stakes (live takes)
or use rip rap (boulders)
what groups does an integrated plan involve
decision makers
advisory group
technical groups
functions of a reference site
used as model for restoration plans
provide target to judge success
control system-where enviro effects unrelated to plan can be assessed
