Linear layout of multiple flow-direction networks for landscape-evolution simulations

Shashank Kumar Anand, Milad Hooshyar, Amilcare Porporato

Research output: Contribution to journalArticle

Abstract

We present an algorithm that is well suited to find the linear layout of the multiple flow-direction network (directed acyclic graph) for an efficient implicit computation of the erosion term in landscape evolution models. The time complexity of the algorithm varies linearly with the number of nodes in the domain, making it very efficient. The resulting numerical scheme allows us to achieve accurate steady-state solutions in conditions of high erosion rates leading to heavily dissected landscapes. We also establish that contrary to single flow-direction methods such as D8, D∞ multiple flow-direction method follows the theoretical prediction of the linear stability analysis and correctly captures the transition from smooth to the channelized regimes. We finally show that the obtained numerical solutions follow the theoretical temporal variation of mean elevation.

Original languageEnglish (US)
Article number104804
JournalEnvironmental Modelling and Software
Volume133
DOIs
StatePublished - Nov 2020

All Science Journal Classification (ASJC) codes

  • Software
  • Environmental Engineering
  • Ecological Modeling

Keywords

  • Efficient numerical solver
  • Hydrogeomorphology
  • Landscape evolution modeling
  • Linear ordering

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