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An Improved Anisotropic Scheme for Interpolating Scattered Bathymetric Data Points in Sinuous River Channelsby Tim D. Osting ABSTRACT This paper presents an improved technique for applying three-dimensional bathymetric (bed form) scatter point data of a sinuous, meandering, low-gradient river to a three-dimensional Finite Element grid. A standard inverse distance weighted interpolation scheme (Franke and Nielson, 1980) is used to apply the bathymetric data to each node (interpolant) of the triangular Finite Element mesh. A unique search space algorithm is presented which geospatially limits scatter point input data by utilizing the known anisotropic shape of a river cross-section. Unlike widely distributed interpolation algorithms (ESRI, 2001; SMS, 2002) generally used for interpolating scatter data in similar situations, the new algorithm is capable of rotating the anisotropy coincident with the natural, sinuous curves of the river plan form. In tests using filtered field data, the new algorithm accurately represents natural bathymetry and does so more reliably in areas of sparse field data than the other tested interpolation methods. The highlighted links that follow are connected to Adobe pdf files of the corresponding material. To view them you must have the Adobe Acrobat Reader 3.0. View the Report...(1409 KB)
These materials may be used for study, research, and education, but please credit the authors and the Center for Research in Water Resources, The University of Texas at Austin. All commercial rights reserved. Copyright 2002 Center for Research in Water Resources. |
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