Floodplain Delineation Using TINS

by Cary A. Talbot, Brigham Young Univ, Provo, United States,
Norman L. Jones, Brigham Young Univ, Provo, United States,
E. James Nelson, Brigham Young Univ, Provo, United States,
A. Woodruff Miller, Brigham Young Univ, Provo, United States,

Document Type: Proceeding Paper

Part of: Computing in Civil and Building Engineering


Triangulated Irregular Networks (TINs) are becoming an increasingly common tool for modeling terrain surfaces on the computer. They are formed by the triangulation of scattered xyz data points representing a terrain surface. A computer algorithm has been developed by the authors for the delineation of floodplains using TINs. The program first reads in a data file containing flood stage values for locations on a TIN. A surface representing the water profile is defined by blending sets of planar functions computed from the stage values. This surface is intersected with the TIN using distance-based weighting to determine the boundary of the flooded area. A special propagation scheme is used to ensure that the water surface and TIN intersection does not improperly extend into neighboring basins. Once defined, the floodplain polygon can be exported for use in analytical or GIS software applications.

Subject Headings: Floods | Computer models | Triangulation | Hydrologic models | Terrain models | Terrain | Computer networks | Computer software

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