'Stream of water which flows in channels from high to low ground and ultimately to a lake or the sea, except in desert areas where they may dwindle away to nothing.'
'Rivers [are] dynamic mosiac of spatial elements and ecological processes arrayed hierarchically' (WARD et.al. 2002)
Open systems that form an integral part of the surrounding landscape with which they are highly interactive (WARD, 1989)
Region - Catchment - Stream - Stream Reach - Patch - Class/Grain (rocks, animals)
The heterogeneity characteristics of natural riverine landscapes have been masked in many regions by a long history of river engineering. This leads to a distorted perception of natural patterns and processes.
Rural rivers vs. Urban rivers which are extremely modified.
Channelisation - very straight. Dredged sediment used for levees
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