Fig. 7
From: Greater Alpine river network evolution, interpretations based on novel drainage analysis
Error assessment over a divide due to a change in river steepness that is not included in the reginal χ-calculation. Analysis assumes that there is a low steepness alluvial reach and a higher steepness bedrock reach. The bedrock reach relief (BRR) and the alluvial reach relief (ARR) define the total river relief. Red is the calculated χ-plot for a standard analysis with conventional definition of χ. Black shows the true χ-plot. The change in steepness is marked as transition with a red dot. a Shows the result for the case where base level is set at the maximum ARR, zb = ARRmax, b shows the case where the base level is at the minimum ARR, zb = ARRmin, and c assumes base level at nominal sea level, zb = 0. χ1 and χ2 represent the inferred value of χ on either side of the divide, whereas χa1, χa2 and χb2, χb2 represent the χ-values for the alluvial reach and bedrock reach, respectively. The error in the analysis, χε is given by the difference between the red and black χ-profile