Spatial disaggregation and aggregation procedures for characterizing fluvial features at the network-scale: Application to the Rhône basin (France)

摘要: Network-scale heterogeneity in fluvial forms and processes has been analyzed for decades through the field-based characterization of a reduced number sites. Spatially continuous data sets are increasingly available at national scale (e.g., digital elevation models or aerial orthophotographs) open up new possibilities to investigate spatial structures stream networks. The paper introduces GIS methodological framework support automate large-scale system based on disaggregation aggregation procedures. consists longitudinal discretisation geographical objects into relatively high resolution units characterize features continuously along Because rivers heterogeneous hierarchically organized, aims delineate statistically pattern process-based answer questions appropriate scales. develops implementation procedures characterizing networks geomorphic perspective. We illustrate approach Rhone network, focusing three commonly used classification schemes: streamline, valley bottom, active channel (the latter limited area). is automated using threshold test Pettitt (1979) detect change points univariate series homogeneous throughout network. provide simple application examples potentialities Finally, insights, limitations future challenging issues emerging from discussed.