Meso-scale classification of rivers has been used for decades in hydrology and ecology. Recent research has demonstrated a large potential for using this in ecohydraulics. Habitat modellers have to look at complex systems (e.g. catchments), where problems inherent in applying models developed for small scales applied for larger scales need to be overcome. The use of hydro-morphological units linked to meso-habitats extends the information and helps bypassing the problems arising from scale alteration. The process is called upscaling. This paper presents a physical approach for mesohabitat assessment in small to medium sized rivers, with the purpose of serving as a scaling tool for physical habitat information from micro-scale to macro-scale. Results of the assessment are to be used for population modelling of juvenile Atlantic salmon ( Salmo salar). The system has been tested in Norway and in Great Britain on rivers of various sizes, has a flexible structure, so that it can be adapted to different situations and problems and is also rapid regarding habitat mapping.
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Borsányi et al. (2004) studied this question.