ABSTRACT
Riverine habitat structure and its heterogeneity are determined by spatiotemporal patterns of geomorphological processes. However, only a few researches have quantitatively analyzed geomorphological changes and resultant spatial distributions of habitat structures in a shifting habitat mosaic. We conducted a case study in a middle reach of the Tenryu River in Japan to identify how these changing patterns determine habitat heterogeneity. A set of interval-recording-cameras has been installed at 60 m above riverbed on the electric supply tower located in the middle of the river corridor. Firstly, we identified different types of habitat structures in a reach and analyzed characteristics of flood inundation processes for each habitat type. Secondly, we analyzed, at a micro scale, hardening and softening processes of habitat structures, using a riverbed softness measurement. Thirdly, we developed a 2-D model using the photogrammetric method and quantitatively analyzed erosion and deposition processes at macro and reach scales.
