From REFORM wiki
Section of river subject to similar valley-scale influences and energy conditions.
- Major changes in valley gradient
- Major tributary confluences (significantly increasing upstream catchment area, river discharge)
- Valley confinement (confined, partly-confined, unconfined)
- In mountainous areas, very large lateral sediment inputs
Methods and data sources
- Major segments are identified by applying GIS tools to a DEM with river network overlay, to define downstream breaks in valley gradient (and width) and in upstream contributing area.
- Major segments may be subdivided according to valley confinement interpreted from DEMs
- Google Earth images