Variance of discharge estimates sampled using acoustic Doppler current profilers from moving boats
Journal of Hydraulic Engineering
By: Carlos M. Garcia, Leticia Tarrab, Kevin Oberg, Ricardo Szupiany, and Mariano I. Cantero
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Abstract
This paper presents a model for quantifying the random errors (i.e., variance) of acoustic Doppler current profiler (ADCP) discharge measurements from moving boats for different sampling times. The model focuses on the random processes in the sampled flow field and has been developed using statistical methods currently available for uncertainty analysis of velocity time series. Analysis of field data collected using ADCP from moving boats from three natural rivers of varying sizes and flow conditions shows that, even though the estimate of the integral time scale of the actual turbulent flow field is larger than the sampling interval, the integral time scale of the sampled flow field is on the order of the sampling interval. Thus, an equation for computing the variance error in discharge measurements associated with different sampling times, assuming uncorrelated flow fields is appropriate. The approach is used to help define optimal sampling strategies by choosing the exposure time required for ADCPs to accurately measure flow discharge.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Variance of discharge estimates sampled using acoustic Doppler current profilers from moving boats |
| Series title | Journal of Hydraulic Engineering |
| DOI | 10.1061/(ASCE)HY.1943-7900.0000558 |
| Year Published | 2012 |
| Language | English |
| Publisher | American Society of Civil Engineers |
| Publisher location | Reston, VA |
| Contributing office(s) | Office of Surface Water |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Hydraulic Engineering |
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