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Petter Pilesjö

Petter Pilesjö

Professor

Petter Pilesjö

An integrated raster-tin surface flow algorithm

Author

  • Petter Pilesjö

Editor

  • Qiming Zhou
  • Guo-an Tang
  • Brian Lees

Summary, in English

In this chapter, an alternative surface flow algorithm is presented. The basic idea behind the algorithm is the use of the advantages of TIN-based algorithms within a raster based environment. A gridded raster DEM is used to create a ‘regular TIN’, over which surface flow is estimated. Since each facet in the TIN has a constant slope and slope direction, the estimations of, for example, flow velocity and diversion/convergence are less complicated compared to traditional ‘cell based’ solutions. The flow is treated as ‘water packages’, given specific (point) positions on the surface. The number of water packages per cell is initially set to eight, but this number can be increased or decreased. After each time step, the water packages have moved a certain distance (depending on slope and water depth), and new water packages have been created due to precipitation. In order to keep the number of water packages constant (to reduce memory and computer time), all water packages within a TIN facet are merged after each iteration. Parameters in time and space, e.g. precipitation, infiltration, vegetation and elevation, can all be loaded into the software.

Department/s

  • Centre for Geographical Information Systems (GIS Centre)

Publishing year

2008

Language

English

Pages

237-255

Publication/Series

Lecture Notes in Geoinformation and Cartography

Issue

199049

Document type

Book chapter

Publisher

Springer Science and Business Media B.V.

Topic

  • Remote Sensing
  • Physical Geography

Keywords

  • DEM
  • Hydrological modelling
  • Surface flow
  • TIN
  • Topographical modelling

Conference name

Conference on Terrain Analysis and Digital Terrain Modelling, 2006

Conference date

2006-11-23 - 2006-11-25

Conference place

Nanjing, China

Status

Published

ISBN/ISSN/Other

  • ISSN: 1863-2351
  • ISSN: 1863-2246
  • ISBN: 9783540777991
  • ISBN: 9783540778004