Spatial Topographic Interpolation for Meandering Channels
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146, Issue 5
Abstract
Bathymetric data plays a major role in obtaining accurate results in hydrodynamic modeling of rivers, estuaries, and coasts. Bathymetries are commonly generated by spatial interpolation methods of data on a model grid. Sparse and limited data will impact the quality of the interpolated bathymetry. This study proposes an efficient spatial interpolation framework for producing a channel bathymetry from sparse, cross-sectional data. The proposed approach consists of three steps: (1) anisotropic bed topography data locations transformed to an orthogonal and smooth grid coordinate system that is aligned with its riverbanks and thalweg; (2) sample data are linearly interpolated to generate river bathymetry; and (3) the generated river bathymetry is converted into its original coordinates. The proposed approach was validated with a high spatial resolution topography of the Tieu estuarine branch. In addition, the proposed approach is compared with other spatial interpolation methods such as ordinary kriging, inverse distance weighting, and kriging with external drift. The proposed approach gives a nearly unbiased topography and a strongly reduced RMSE compared with the other methods. In addition, it accurately reproduces the thalweg. The proposed approach appears to be efficiently applicable for regions with sparse cross-sections. Moreover, river topography generated by the proposed approach is smooth including important morphologic features, making it suitable for two- and three-dimensional hydrodynamic modeling.
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Data Availability Statement
The data of river bathymetry that supports the findings of this study are not publicly accessible. However, the data and codes can be available from the corresponding author on reasonable request. The curvilinear grid was created by the Delft3D-RGFGRID which is available (https://oss.deltares.nl/web/delft3d/general/subpage1).
This project is part of the ONR Tropical Deltas DRI and is funded under grants N00014-12-1-0433 and N00014-15-1-2824.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 146 • Issue 5 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 26, 2019
Accepted: Jan 17, 2020
Published online: May 19, 2020
Published in print: Sep 1, 2020
Discussion open until: Oct 19, 2020
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