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Surface Models for Geosciences

Part of the series Lecture Notes in Geoinformation and Cartography pp 237-247

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Hydraulic Erosion Modeling on a Triangular Mesh

  • Věra SkorkovskáAffiliated withNTIS—New Technologies for Information Society, University of West BohemiaDepartment of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Email author 
  • , Ivana KolingerováAffiliated withNTIS—New Technologies for Information Society, University of West BohemiaDepartment of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia
  • , Bedrich BenesAffiliated withDepartment of Computer Graphics Technology, Knoy Hall of Technology

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Abstract

Although hydraulic erosion modeling on a GIS terrain models has been addressed by a body of previous work, it still remains an open problem. In GIS, raster representation and triangular irregular networks (TIN) are the most commonly used surface models, because they are simple and offer implicit topological information. However, these data structures do not allow the simulation of erosion on concave terrain features, such as caves or overhangs. Other methods, more commonly used in the computational fluid dynamics, use volumetric data representation. They are able to model the 3D features, but they usually have high memory requirements and are computationally demanding. We propose a novel solution to the hydraulic erosion modeling problem that uses a triangular mesh data structure. Our framework allows for adaptive changes of the mesh resolution according to the local complexity of the terrain, which leads to lower memory requirements when compared to the volumetric approaches. Our data structure also supports the visualization of the concave 3D features, allowing the simulation and visualization of erosion on terrain elements such as tunnels or caves.

Keywords

Hydraulic erosion Erosion Terrain modeling Smoothed particle hydrodynamics Triangular mesh