Comparing methods for calculating channel steepness index

Surface Uplift and Topographic Rejuvenation of a Tectonically Inactive Range: Insights From the Anti‐Atlas and the Siroua Massif (Morocco)

“…A Shuttle Radar Topography Mission Digital Elevation Model (SRTM DEM, pixel size of 90 m) was used to perform the topographic and the river network analysis described above. All steps were conducted using ArcGIS tools, TopoToolbox (Schwanghart & Scherler, 2014), TAK (Forte & Whipple, 2019) and a series of MATLAB functions (Gallen & Wegmann, 2017; Goren et al., 2014; Smith et al., 2022).…”

“…This approach was extended by Fox and Carter (2020) and Smith et al. (2022) to account for spatial variability in surface uplift. The basis of this approach is that a discrete version of the stream power model can be written using a series of nodes along the main trunk river: $$${z}_{i}-B.L.=\sum\limits _{j=1}^{i}\left({\Delta }{\chi }_{j}\right){u}_{j}^{\ast }+{S.U.$$…”

“…Provided both vary smoothly in space over long length scales, the elevation of pixels within the DEM can be used to recover these values using inverse methods. The results provide a reconstructed pre‐incision landscape and allows quantifying the amount of surface uplift for each node (Smith et al., 2022). Maps of u* and S.U.…”

“…A two-dimensional approach, proposed by Fox (2019), allows reconstructing the paleo-topography ensuring tributaries and trunk streams share the same elevation at confluences. This approach was extended by Fox et al (2020) and Smith et al (2022) to account for spatial variability in surface uplift.…”

“…A two-dimensional approach, proposed by Fox (2019), allows reconstructing the paleo-topography ensuring tributaries and trunk streams share the same elevation at confluences. This approach was extended by Fox and Carter (2020) and Smith et al (2022) to account for spatial variability in surface uplift. The basis of this approach is that a discrete version of the stream power model can be written using a series of nodes along the main trunk river:…”