This study presents the application of LIDAR data to the evaluation and quantification of fluvial habitat in river systems,
coupling remote sensing techniques with hydrological modeling and ecohydraulics. Fish habitat studies depend on the
quality and continuity of the input topographic data. Conventional fish habitat studies are limited by the feasibility of
field survey in time and budget. This limitation results in differences between the level of river management and the
level of models. In order to facilitate upscaling processes from modeling to management units, meso-scale methods were
developed (Maddock & Bird, 1996; Parasiewicz, 2001). LIDAR data of regulated River Cinca (Ebro Basin, Spain) were
acquired in the low flow season, maximizing the recorded instream area. DTM meshes obtained from LIDAR were used
as the input for hydraulic simulation for a range of flows using GUAD2D software. Velocity and depth outputs were
combined with gradient data to produce maps reflecting the availability of each mesohabitat unit type for each modeled
flow. Fish habitat was then estimated and quantified according to the preferences of main target species as brown trout
(Salmo trutta). LIDAR data combined with hydraulic modeling allowed the analysis of fluvial habitat in long fluvial
segments which would be time-consuming with traditional survey. LIDAR habitat assessment at mesoscale level avoids
the problems of time efficiency and upscaling and is a recommended approach for large river basin management.
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