Quantifying uncertainty in acoustic measurements of tidal flows using a ‘Virtual’ Doppler Current Profiler

Crossley, George; Alexandre, Armando; Parkinson, Stephen T.; Day, Sandy; Smith, Helen; Ingram, David

doi:10.1016/j.oceaneng.2017.04.015

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…Thus, the horizontal current velocities were synthetically generated as a function of depth using this power-law relationship. The typical exponent power value is considered as 1/7 in this relationship [19,20] which is used for this analysis. However it is recognized that the 1/7 th power-law is not representative of all tidal energy sites.…”

Section: Currentsmentioning

confidence: 99%

“…It is necessary to correct the data for ADP motion to reduce this error and this process is called "bin mapping", "depth cell mapping" or "tilt compensation" and is illustrated in Figure 2. The errors during the procedure depend on the degree of the tilt and also the method used for bin mapping [19]. The standard linear interpolation technique [13] is used as the bin-mapping method in this study.…”

Section: Pitch/roll Movementsmentioning

confidence: 99%

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Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data

Rathnayake

Folley

Gunawardane

et al. 2020

JMSE

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Representing the velocity at a tidal energy extraction site in a standardized manner is essential for the development of the tidal energy sector. The International Electrotechnical Commission (IEC) have issued a technical specification to determine the mean representative current velocity (MRV) relative to a tidal energy converter (TEC). This method determines the MRV using an acoustic Doppler profiler (ADP). This is used to evaluate the power performance of a TEC and so can have a significant influence on the power performance uncertainties, due to the cubed relationship of the MRV and power. This paper investigates these uncertainties in the MRV by considering four sources of uncertainty in the ADP. These are turbulence intensity, tilt, Doppler noise and beam misalignment of an ADP. A synthetically generated dataset is used to define current velocity and profile using the characteristics of currents and ADP. The generated synthetic dataset is processed to calculate the MRV based on the standard IEC method. An alternative method to calculate the MRV, called the temporal-spatial method (TSM), is proposed and the two methodologies are used to assess the error of the MRV. A sensitivity analysis shows that the errors of the MRV based on the standard IEC method are always higher than the TSM. The biases in the MRV based on the different combinations of the uncertainty are investigated and it is found that the bias for the MRVs based on the TSM method is generally less than that of the IEC method.

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Section: Currentsmentioning

confidence: 99%

Section: Pitch/roll Movementsmentioning

confidence: 99%

Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data

Rathnayake

Folley

Gunawardane

et al. 2020

JMSE

View full text Add to dashboard Cite

show abstract

“…However, such an analysis does not take into account the specificity of a realistic flow field, and in particular the potential spatial variability of the flow characteristics. The validity of ADCP data processing can be assessed through Virtual-ADCP (V-ADCP) methods, which consists in applying ADCP data processing to a controlled flow field generated analytically [Crossley et al (2017)] or by numerical simulation [Tokyay et al (2009); Richmond et al (2015)]. The velocity field should be representative of the studied environmental flow.…”

Section: Introductionmentioning

confidence: 99%

Turbulence measurements: An assessment of Acoustic Doppler Current Profiler accuracy in rough environment

et al. 2021

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Quantifying uncertainty in acoustic measurements of tidal flows using a ‘Virtual’ Doppler Current Profiler

Cited by 2 publications

References 20 publications

Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data

Investigation of the Error of Mean Representative Current Velocity Based on the Method of Bins for Tidal Turbines Using ADP Data

Turbulence measurements: An assessment of Acoustic Doppler Current Profiler accuracy in rough environment

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