FS
fluvial systems
fluvial systems
Set of flashcards Details
| Flashcards | 88 |
|---|---|
| Language | Deutsch |
| Category | Nature Studies |
| Level | Primary School |
| Created / Updated | 27.01.2014 / 18.01.2020 |
| Weblink |
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main components of natural flow regime
5 critical components:
magnitude of flow
frequency of occurence of flow above a given magnitude
duration of flood, low flow etc
timing/predictability of flow: important for seeds
rate of change / flashiness: change a lot due to dams (dQ/dt)
local scale management
allows management of physical processes/landforms
direct form of management
rather local effect only, does not fix the problem - just its effects
easy to controll
small consensus needed
cause + effects are obvious
usefull to threat sections only - e.g. between irreparable sections
examples of local scale management
increase roughness
setting back flood defense
re-connectin side arms
mimikry natural flow hydrograph
deposit sediment
managing vegetation + wood debris
catchment scale management
sustainable solution
does fix the whole system
not very practical
why is catchment scale management not practical
difficult to predict impact
uncontrolled management: not aceptable to managers & owners
too many stakeholders: difficult for consensus
examples of catchment scale management
managing downstream of dams: e.g. recruitment box
managing water abstraction level: controll of timing, quantity, seasonality
managing sediment flux
allow landslides
how to assess the sucess of a river restoration project
assesment requires:
measure range of ecosystem attributes
identify value of it
compare restored- unrestored forest
compare with reference forest
+ monitoring!
how to monitor a restoration project?
variables that do not vary
measure: key physical processes
biological response
simple + practical
repeated + compared
rapide response
