Science Advances

Supplementary Materials

This PDF file includes:

  • Global aridity and branching angles
  • NHDPlusV2 data analysis
  • NHD data analysis for the State of Alaska
  • fig. S1. Measurement of the branching angle as defined in (21).
  • fig. S2. Branching angles for two basins in the arid southwest of the United States.
  • fig. S3. Histograms of valley slope for the two Mars data sets (Hynek and Hoke, orange circles; Luo and Stepinski, rose-colored squares) and the Upper Colorado-Dirty Devil basin (HUC 1407, violet solid line) as mapped by the NHDPlusV2 data set.
  • fig. S4. Branching statistics of the raw NHD streams of the State of Alaska (50) categorized in regions with continuous permafrost (violet), discontinuous permafrost (magenta), and no permafrost (green).
  • References (46–50)

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