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Lookup NU author(s): Dr Borbala Hortobagyi
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© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. The geometry of impounded surfaces is a key tool to reservoir storage management and projection. Yet topographic data and bathymetric surveys of average-aged reservoirs may be absent for many regions worldwide. This paper examines the potential of contour line interpolation (TOPO) and Structure from Motion (SfM) photogrammetry to reconstruct the topography of existing reservoirs prior to dam closure. The study centres on the Paso de las Piedras reservoir, Argentina, and assesses the accuracy and reliability of TOPO- and SfM- derived digital elevation models (DEMs) using different grid resolutions. All DEMs were of acceptable quality. However, different interpolation techniques produced different types of error, which increased (or decreased) with increasing (or decreasing) grid resolution as a function of their nature, and relative to the terrain complexity. In terms of DEM reliability to reproduce area–elevation relationships, processing-related disagreements between DEMs were markedly influenced by topography. Even though they produce intrinsic errors, it is concluded that both TOPO and SfM techniques hold great potential to reconstruct the bathymetry of existing reservoirs. For areas exhibiting similar terrain complexity, the implementation of one or another technique will depend ultimately on the need for preserving accurate elevation (TOPO) or topographic detail (SfM).
Author(s): Casado A, Hortobagyi B, Roussel E
Publication type: Article
Publication status: Published
Journal: International Journal of Geographical Information Science
Year: 2018
Volume: 32
Issue: 12
Pages: 2427-2446
Online publication date: 05/09/2018
Acceptance date: 09/08/2018
ISSN (print): 1365-8816
ISSN (electronic): 1362-3087
Publisher: Taylor and Francis Ltd.
URL: https://doi.org/10.1080/13658816.2018.1511795
DOI: 10.1080/13658816.2018.1511795
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