Abstract
This research aims to improve data post-processing from an acoustic Doppler current profiler (ADCP) to obtain additional depth information with a high-quality bathymetric result. To validate the depth, dataset in a control area was used a scaled rod, the RTK (Real-Time Kinematic) positioning technique, and a single beam echo sounder (SBES). The developed post-processing and validation in the control area applied to a small region of a water supply reservoir in Brazil. A robust local regression method eliminated outliers from the raw data. Subsequently, a linear regression model was generated for the beams from the ADCP to adjust depths and improve the dataset. The statistical hypothesis test performed before and after the adjustment supported the validation of data processing. The resulting volumes calculated from the ADCP raw data showed a difference of 30% with SBES, which is usually the standard equipment used for bathymetric surveys. The proposed post-processing techniques declined to < 1% of the volume discrepancy. The raw dataset standard deviation was 0.15 m on average for Doppler beams, and after adjusts, this value dropped to 0.03 m. The results showed the necessity of a post-processing method to improve depth data quality from ADCP. Thus, the procedure described in this document can be used for bathymetric surveys using ADCP for analysis concerning the estimation of reservoir volume.
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Source: Adapted from Marcon (2018)
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Notes
For more information on the calculation of the TVU, consult the Standards for Hydrographic Surveys (S-44) (IHO 2020).
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Acknowledgments
The authors thank the Sanepar sanitation company for authorizing the study in the Passaúna reservoir and for providing the logistic and field support during the surveys, the Laboratory of Space Geodesy and Hydrography of the Federal University of Parana (LAGEH—UFPR) for the logistic and field support, and the Coordination for the Improvement of Higher Level Education Personnel—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the financial support through a doctorate scholarship.
Funding
The research was funded by the Sanepar Sanitation Company, the German Federal Ministry of Education and Research (BMBF) within the funding framework of Water as a Global Resource (GRoW). Project Title: Multidisciplinary data acquisition as the key for a globally applicable water resource management (MuDak-WRM). The main author received a CAPES doctorate scholarship. The co-author Tobias Bleninger acknowledges the support by the Brazilian Council for Research, CNPq (productivity stipend number. 8786885193878624, call: CNPq N° 12/2017).
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Nakao, L.T.H., Krueger, C.P. & Bleninger, T. Benchmarking for using an acoustic Doppler current profiler for bathymetric survey. Environ Monit Assess 193, 356 (2021). https://doi.org/10.1007/s10661-021-09073-3
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DOI: https://doi.org/10.1007/s10661-021-09073-3