• channel network;
  • effects of cutoffs on river network topology;
  • headwater subcatchments;
  • invariant indices;
  • lateral subcatchments;
  • morphometric properties

Channel networks transport water through a catchment and play a key role in hydrology. Understanding the network properties can be useful, so Moussa et al. developed a model to calculate the morphometric properties of catchments. They found some parameters that are the same in all natural channel networks (though not in all virtual networks), regardless of the size or shape of the catchment. In particular, the total area of the headwater catchment is always the same fraction (about 29%) of the total basin area. (Water Resources Research, doi:10.1029/2010WR010132, 2011)