Embedding landscape processes into triangulated terrain models

Enrique R. Vivoni, Vanessa Teles, Valeriy Y. Ivanov, Rafael L. Bras, Dara Entekhabi

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Triangulated irregular networks (TIN) can form the basis for multiple-resolution representations in distributed hydrogeomorphic simulations over complex basins. Current methods for deriving TIN meshes depend primarily on surface slope without considering other terrain attributes significant to the watershed response such as the specific basin area. As an alternative, we present a methodology for combining a hydrogeomorphic or landscape index with an unstructured triangulated mesh. Landscape indices provide a concise method for describing steady-state terrain processes by isolating the dominant physical factors. The mesh-generation algorithm results in an adaptive discretization that resembles the spatial pattern of the landscape index with a high resolution retained in areas expected to impact the basin response. We compare the proposed algorithm with a slope-preserving method as a means for initializing the terrain representation in two TIN-based hydrogeomorphic models. Through three case studies in saturation-excess runoff, transport-limited soil erosion and shallow landslide simulation, we assess the distributed model sensitivity to the triangulated terrain algorithm. Model comparisons reveal that the process-based triangulations focus the distributed simulation in regions anticipated via a steady-state index to affect the transient watershed response.

Original languageEnglish (US)
Pages (from-to)429-457
Number of pages29
JournalInternational Journal of Geographical Information Science
Volume19
Issue number4
DOIs
StatePublished - Apr 1 2005
Externally publishedYes

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Keywords

  • Distributed models
  • Geomorphology
  • Hydrology
  • Index
  • Landscape processes
  • Mesh generation
  • Topography
  • Triangulated irregular networks

ASJC Scopus subject areas

  • Information Systems
  • Geography, Planning and Development
  • Library and Information Sciences

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