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Floodplain/Fluvial Landscape Restoration

 
Step Wise Guide
 
Channels/Floodplains
 
 
One of the major challenges in river restoration is to identify floodplains in catchments with a long history of river control. Intensive land use on valley floors often predates the earliest remote sensing: levees, dikes, dams, and other structures alter valley-floor morphology, river channels and flow regimes. NetMap's floodplain tool can be used to identify locations along valley floors where floodplains may be obscured by past development (agriculture, urbanziation, roads, dikes etc.).
 
Mapping floodplains can be used to identify areas where they have been obscured by developments such as diking, agriculture, urbanization and roads. See an example how mapping floodplains was used in restoration planning.
 
Step 1: Go to:  NetMap Fluvial Morphology Tools > Floodplain Mapping. NetMap digital watersheds contain a default floodplain prediction calculated at 2x bankfull depth. You can adjust the elevation above the channel in which to calculate (map) floodplains (1x, 3x etc.). For an example of how the floodplain tool was used for watershed wide restoration planning in Spain, go here.
 
Fluvial Landscape
The more comprehensive "fluvial landscape" can be mapped using NetMap technology.  The morphological patterns indicative of the fluvial landscape including multiple channels, extensive floodplains, wetlands, and fluvial-riparian and tributary-confluence dynamics. The fluvial landscape is likely highly spatially patchy and distributed according to variations in topography, valley morphology, river network structure, and fan and terrace landforms.
 
The relevant tools in NetMap include: (1) channel gradients, (2) floodplains, (3) terraces, (4) tributary confluences, (5) valley morphology, reflected in transitions of valley width, (6) erosion potential, including debris flows at tributary junctions, (7) zones of sedimentation, (8) thermal loading, (9) woody debris accumulation types, and (10) large landslides/earthflows. Refer to the individual tools in NetMap and as discussed in the Technical Help to conduct your own analysis of the "fluvial landscape". To see an example of the tools in action, go here and here.