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Published October 6, 2023 | Version 1.0
Software Open

Drainage divide asymmetry script to calculate DAI using multiple geomorphic metrics

Creators

  • 1. Department of Earth Science, ETH Zürich, Switzerland
  • 2. Earth Surface Process Modelling, GFZ German Centre for Geoscience Research

Description

This is a MATLAB script that calculates drainage divide asymmetry using multiple geomorphic metrics through modifications to Scherler and Schwanghart's (2020) asymmetry function for TopoToolbox (Schwanghart and Scherler, 2014).

The script allows the user to calculate divide asymmetry using the following geomorphic metrics:
1 - Relief
      a) catchment-restricted local relief (CRR) -- requires additional script: https://doi.org/10.5281/zenodo.8363611
      b) local relief
2 - hillslope gradient 
3 - normalized channel steepness (ksn)
      a) with precipitation/discharge correction
      b) without precipitation/discharge correction
4 - normalized channel distance (χ)
      a) with precipitation/discharge correction
      b) without precipitation/discharge correction

Divide asymmetry is calculated using Scherler and Schwanghart's (2020) divide asymmetry index (DAI). Results are output as both points and lines (including divide Strahler order) and can be exported as ESRI shapefiles.

The zip file contains three MATLAB scripts:
1 - divide_asymmetry_V1.m: run this script to calculate divide asymmetry
2 - asymmetry_line.m: modified asymmetry.m function that outputs lines instead of points
3 - reproject_or_align.m: uses TopoToolbox functions to reproject and align input grids for the other scripts

Files

divide_asymmetry_V1.zip

Files (6.7 kB)

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md5:61a0c31faccc0291314bd5c6f3db6484
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Additional details

Funding

Swiss National Science Foundation
Landscape Evolution of the Hengduan Mountains IZLCZ0_189846

References

  • Schwanghart, W., & Scherler, D. (2014). TopoToolbox 2–MATLAB-based software for topographic analysis and modeling in Earth surface sciences. Earth Surface Dynamics, 2(1), 1-7.
  • Scherler, D., & Schwanghart, W. (2020). Drainage divide networks–Part 1: Identification and ordering in digital elevation models. Earth Surface Dynamics, 8(2), 245-259.
  • Gelwick, Katrina D., & Ott, Richard F. (2023). Catchment-restricted Relief (CRR) Map (1.0). Zenodo. https://doi.org/10.5281/zenodo.8363611