Description

An upward-looking acoustic Doppler velocity meter (ADVM, SonTek SW, 3.0 MHz) located in a tidal channel of the Nisqually River Delta at site D3 (N 47d 05’ 36.5”/W 122d 42’ 42.9”) measured water level and current velocity at 15-minute intervals from April 1, 2017 to July 20, 2017 (80.9 days, excluding missing periods). This site is in a tidal channel at a levee breach where flow is tidally influenced. The water depth of the sensor ranged from 0.05 to 3.04 m and may have been lower during periods of extreme low tide. The elevation (NAVD88) of the ADVM sensor was surveyed by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is 0.47 meters. The instrument temperature ranged from 7.2 to 23.0 degrees C but may be bias during periods of low tide due to solar heating of the submerged instrument. The mean downstream velocity component (Vx) ranged from -0.81 to 0.81 m/s. The mean vertical velocity component (Vy) ranged from -0.40 to 0.49 m/s and signal to noise ratio ranged from 21.3 to 82.8 dB. The ADVM measured the water-velocity profile using a dynamic boundary adjustment mode allowing up to 10 velocity measurements in the water-column profile. Time-series gaps of 15-minutes or more occurred when the instrument was offline, when error thresholds were exceeded, or when the water level in the channel dropped below the elevation of the sensor during periods of extreme low tide. Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081525&agency_cd=USGS&

Resources

Name	Format	Description	Link
	55	Landing page for access to the data	https://doi.org/10.5066/F7GF0SG7
	55	The metadata original format	https://data.usgs.gov/datacatalog/metadata/USGS.59f8d796e4b063d5d309f216.xml

Water Data for Nisqually River Delta at Site D3 (ver. 1.1, December, 2019)

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