Data for the development of a new method for dynamically estimating exposure time for turbulent flow measurements

The mission of the U.S. Geological Survey (USGS) involves providing reliable, impartial, and timely information that is needed to understand the Nation?s water resource. New techniques that aid in achieving this mission are important, especially those that allow USGS to do so more accurately or cost-effectively. To this end, a new method for selecting the optimum exposure time for velocity and discharge measurements has been explored. These data were assembled to assist in the development and evaluation of this new method. Four kinds of time-series data are available and used for this purpose. They are: (1) model-derived synthetic velocities, (2) point-velocity measurements in laboratory flumes, (3) point-velocity measurements in streams, and (4) water velocity profile measurements in streams. The model-derived velocity data were obtained using methods described in Garcia and others (2005). Point-velocity flume measurement data were obtained using a Nortek 16 MHz acoustic Doppler velocimeter (ADV) for the purpose of characterizing turbulence in the flow in a flume. Point-velocity measurement data collected in the field were obtained using a SonTek Flowtracker ADV (1 MHz) and an OTT acoustic Doppler current meter or ADC (6 Mhz) as a part of routine mid-section discharge measurements. Water velocity profile measurements in streams were collected using SonTek and Teledyne RD Instruments Acoustic Doppler current profilers (ADCPs) during routine mid-section discharge measurements. The laboratory ADV data were collected, processed, and exported using the associated ADV software. The point-velocity field measurement data were reviewed by an experienced user and by means of built-in data-quality checks in the manufacturer software. ADCP water velocity profile measurements were collected and processed with the instrument manufacturer software. Data are provided in the zip file, 'DynamicExpTime.zip' which contains 4 types of times series data. The model-derived velocities are provided in a spreadsheet format. The ADV, ADC, Flowtracker, and ADCP data were exported from their native file formats and are provided in comma-separated value and ASCII text files. References Garcia, C. M., Cantero, M. I., Ni?o, Y., and Garcia, M. H. (2005). Turbulence measurements with Acoustic Doppler velocimeters: Journal of Hydraulic Engineering: v. 131 no. 12. [Also available at https://doi.org/10.1061/(asce)0733-9429(2005)131:12(1062).]