The importance of ADCP alignment with GPS in moving-boat streamflow measurements

Huang, Hening

doi:10.1016/j.flowmeasinst.2019.04.002

Cited by 11 publications

(7 citation statements)

References 13 publications

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“…However, the difference in accuracy between the multi-view and small-angle refraction correction methods was only small. This supports the findings of Woodget ADCP could be biased in cases of poorly aligned transects caused by a moving bed at fine-grained river channels (Huang, 2019).…”

Section: Discussionsupporting

confidence: 90%

“…Another factor which had the potential to impact the discharge estimate was the accuracy of the extracted cross‐sections, which relied on the success of the reconstructed bathymetry. Moreover, discharge estimation with ADCP could be biased in cases of poorly aligned transects caused by a moving bed at fine‐grained river channels (Huang, 2019).…”

Section: Discussionmentioning

confidence: 99%

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Hydro‐morphological mapping of river reaches using videos captured with UAS

Eltner

Bertalan

Grundmann

et al. 2021

Earth Surf Processes Landf

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Unoccupied aerial systems (UASs) are frequently used in the field of fluvial geomorphology due to their capabilities for observing the continuum rather than single sample points. We introduce a (semi-)automatic workflow to measure river bathymetry and surface flow velocities of entire river reaches at high resolution, based on UAS videos and imagery. Video frame filtering improved the visibility of the riverbed using

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Hydro‐morphological mapping of river reaches using videos captured with UAS

Eltner

Bertalan

Grundmann

et al. 2021

Earth Surf Processes Landf

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“…The wider the river, the more uncertainty is introduced to a video recording from the riverbank due to an increasing degree of perspective distortion. Though this angle of video recording may be still suitable for estimating the average flow velocity or discharge [41,53,65,66], it does not allow to recognise small-scale flow patterns, especially in the areas that are closer to the riverbank opposite to the one where the camera is mounted. The use of cameras mounted on and under bridges limits data acquisition to areas where bridges are present.…”

Section: Discussionmentioning

confidence: 99%

Drone-Based Optical Measurements of Heterogeneous Surface Velocity Fields around Fish Passages at Hydropower Dams

et al. 2020

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In Austria, more than a half of all electricity is produced with the help of hydropower plants. To reduce their ecological impact, dams are being equipped with fish passages that support connectivity of habitats of riverine fish species, contributing to hydropower sustainability. The efficiency of fish passages is being constantly monitored and improved. Since the likelihood of fish passages to be discovered by fish depends, inter alia, on flow conditions near their entrances, these conditions have to be monitored as well. In this study, we employ large-scale particle image velocimetry (LSPIV) in seeded flow conditions to analyse images of the area near a fish passage entrance, captured with the help of a ready-to-fly consumer drone. We apply LSPIV to short image sequences and test different LSPIV interrogation area sizes and correlation methods. The study demonstrates that LSPIV based on ensemble correlation yields velocities that are in good agreement with the reference values regarding both magnitude and flow direction. Therefore, this non-intrusive methodology has a potential to be used for flow monitoring near fish passages on a regular basis, enabling timely reaction to undesired changes in flow conditions when possible.

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“…Although the measurement procedures may present differences between ADCP companies, the moving-boat measurement results are commonly the average of elemental discharges based on a number of transects, which is crossings of the stream, under approximately steady flow conditions. Ideally, the average includes pairs of reciprocal transects to minimize directional biases in measured discharges, due to asymmetrical deployment, compass, or heading errors [9,10] . Given the use of ADCP measurements as inputs to flow monitoring and decision-making activities related to water resources [11,12] , the uncertainty has to be estimated carefully in addition to a quality assurance and quality control process [13,14] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ADCP Streamflow Measurements in Open Channel

Liu¹,

Hu²,

Qiu³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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The purpose of this paper is to explore the potential of calibration of ADCP discharge measurement in open channel, which conclusion can improve the traceability of ADCP. In this paper, the current velocity and discharge synthesis and other important issues are taken into consideration, and establishes a set of rectangular open channel standard discharge facility, and conducts experimental research on the flow measurement by using Workhorse. The moving boat ADCP measurement uncertainty source is analyzed, and the error situation introduced by the approximate solution is analyzed. By estimating the back scattering intensity, a new type of acoustic reflector is designed, so that the signal quality of ADCP can be kept in the best state in the process of towing calibration, so as to ensure the reliability of the WT measurement results. An experimental device for WT, BT, depth measurement is established to evaluate the basic performance of the instrument. At last an ultrasonic transit time flow-meter(UFM) is taken as reference in field situation, to calibrate the discharge directly, the results are close to laboratory calibration.

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The importance of ADCP alignment with GPS in moving-boat streamflow measurements

Cited by 11 publications

References 13 publications

Hydro‐morphological mapping of river reaches using videos captured with UAS

Hydro‐morphological mapping of river reaches using videos captured with UAS

Drone-Based Optical Measurements of Heterogeneous Surface Velocity Fields around Fish Passages at Hydropower Dams

Evaluation of ADCP Streamflow Measurements in Open Channel

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