Water Data for Nisqually River Delta at Site D4 (ver. 1.1, December, 2019)

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 D4 (N 47d 05’ 37”/W 122d 42’ 18.7”) measured water level and current velocity at 15-minute intervals from October 13, 2016 to May 3, 2017 (158 out of 202 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 0.19 to 3.71 m and may have been lower during periods of extreme low tide. The sensor elevation was adjusted during inspection on 10/03/2017 and a correction of +0.33 m was added to water depth from 10/03/2017 to 03/13/2017. The elevation (NAVD88) of the ADVM sensor was survey by RTN-GPS. The offset to convert all water depth time-series data to water surface elevation (NAVD88) is -0.18 meters. The instrument temperature ranged from -0.4 to 15.9 degrees C. but may have been bias during periods of low tide due to solar heating of the instrument. Water level in the channel dropped below the elevation of the sensor during periods of low tide. The mean downstream velocity component (Vx) ranged from -0.91 to 1.07 m/s. The mean vertical velocity component (Vy) ranged from -0.20 to 0.26 m/s and signal to noise ratio ranged from 17.6 to 50.4 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 or when error thresholds were exceeded. Also at this site, a non-vented, multiparameter sonde (YSI, 600 OMS) measured water depth, water temperature, specific conductance, salinity, and turbidity at 15-minute intervals from October 12, 2016 to March 31, 2017 (123 out of 170 days, excluding missing periods). The depth ranged from 0.06 to 3.66 m. The water temperature ranged from -0.3 to 16.1 degrees C. The specific conductance ranged from 160 to 38,850 micro-siemens per centimeter (uS/cm), and 0.1 to 24.7 practical salinity units (PSU). The turbidity ranged from 2.1 to 1,108 formazin nephelometric units (FNU). This site is also referenced as "USGS 12081518 Area Three near Olympia, WA". Discrete discharge data at this site are available at: https://waterdata.usgs.gov/wa/nwis/inventory/?site_no=12081518&agency_cd=USGS&

                                            [
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                                            {
  "fn": "Chad C. Opatz",
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                                            [
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