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Assessment of the accuracy of different standard methods for determining reservoir capacity and sedimentation

  • PROGRESS IN EROSION AND SEDIMENTATION IN LATIN AMERICA
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Abstract

Purpose

Determination of reservoir volume has been used in the calculation of sedimentation, hydrodynamic modelling, and dam safety assessment, among others, and the method used as well as its associated error play an important role in the quality of these studies. This study assessed the accuracy of reservoir volume calculations based on different standards for the definition of the spacing between bathymetric range lines. A technique for terrain modelling and a method for determining the survey accuracy are also proposed.

Materials and methods

The reference reservoir volume was based on highly detailed bathymetry (10 m resolution). Seven different spacings were selected, which generated 99 separate bathymetric data sets. For each data set, the volume was calculated based on a digital terrain model according to the usual model (triangular irregular network (TIN)) and according to the insertion of mesh points (IMP) method. This was then compared with the reference volume, and the accuracy of each survey was determined.

Results and discussion

Utilization of a highly detailed and reliable bathymetric survey allowed for the assessment of the associated error in each of the bathymetric data sets, as well as of the spacing standards analyzed. The accuracy of the standards analyzed using TIN modeling ranged from 0.31% to 14.40% (30 and 300 m, respectively). The high errors are attributed to the limitation of the TIN in representing regions near shores, producing incorrect shallow depth readings, resulting in a lower calculated volume than the real volume. IMP modeling exhibited great improvement in performance over the standard TIN (i.e., for 300 m accuracy of 5.51% for IMP and 14.40% for standard TIN), and in none of the cases were the generated volumes greater than the reference volume.

Conclusions

The IMP method proved to be consistent, improving quality of the data while reducing effort in field work. The low accuracies found showed that even surveys following the widely accepted standards contain errors of a magnitude that cannot be ignored. Thus, knowing and evaluating the survey accuracy is of fundamental importance. Definition of standard spacing for reservoirs proved to be unfeasible. This must be defined on a case-to-case basis, considering the error acceptable for the purpose of the survey.

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Acknowledgments

We thank the Geological Service of Brazil–CPRM, the National Research Council–CNPq, Prof. Miguel Petrere Jr., Dr. Fabio Cop Ferreira, the Foundation to Promote Research and Industrial Refinement–FIPAI, and the São Carlos School of Engineering–EESC/USP.

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Correspondence to Marcus Vinicius Estigoni.

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Responsible editor: Jorge Enoch Furquim Werneck Lima

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Estigoni, M.V., Matos, A.J.S. & Mauad, F.F. Assessment of the accuracy of different standard methods for determining reservoir capacity and sedimentation. J Soils Sediments 14, 1224–1234 (2014). https://doi.org/10.1007/s11368-013-0816-x

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  • DOI: https://doi.org/10.1007/s11368-013-0816-x

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