Field Review of SonTek RiverSurveyor Stationary Live Data

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Detailed Description

This video discusses the basic field review procedures for midsection ADCP data collected in SonTek RiverSurveyor Stationary Live. Note: Use of trade names is for descriptive purposes only, and does not imply endorsement by the USGS.

Details

Image Dimensions: 480 x 360

Date Taken:

Length: 00:05:38

Location Taken: Augusta, ME, US

Transcript

Hi, my name is Nick Stasulis and I am hydrologic
technician with the Maine office of the New

England Water Science Center.

In this screencast, I will discuss the basic
field review procedures for a midsection measurement

collected in RiverSurveyor Stationary Live.

-Let’s start with the System Tab
-In the System Settings, look over the tagline

azimuth, which is only entered if the compass
was used for angle correction, and check the

salinity, as well.

The azimuth should be the heading of the cross-section
in the direction of the right river bank.

-Confirm the track reference is set to system
(the default) and the depth reference is set

to bottom track or vertical beam, as appropriate
-The discharge method should be set to mid-section.

-In the field notes, confirm the water temperature
and ADCP readings were within 2 deg C before

the measurement began.

If there were discrepancies, a user input
water temperature could be entered here, but

this should not be routine.

This temperature will override the ADCP temperature.

-Most of the other information in the system
tab is supplementary and does not affect discharge

computations.

-Next, we’ll review the Transect Tab
-This tab is likely the most efficient place

to determine major data quality issues.

-Start by scanning the contour plot for any
irregularities in depth, velocity, ice information

and other information displayed.

Also ensure there is a black space at the
top of each station, indicating a screening

distance was entered.

Ideally, no station would have more than 5%
of the total flow.

-Scan the angles indicated using XYZ (where
the unit is aligned manually) or ENU (where

the compass is used to correct for angles).

Inconsistent angles could be attributed to
user error in how the unit was held when using

XYZ or due to an incorrect tagline azimuth
or compass errors when using ENU.

Ultimately, you should ensure indicated angles
are reasonable based on observed flow conditions

and make hydraulic sense.

-Starting on either edge, scan through the
stations using the left/right arrow keys and

look over the SNR and velocity profile plots.

In the SNR plots, look for large inconsistencies,
including separation between beams and spikes

in one or more beams.

In the velocity plot, look for reasonable
agreement of the measured data with the extrapolated

data, and for a general reasonable profile
shape vertically.

A separate screencast will cover evaluating
extrapolation in more detail.

-Double clicking on any station will bring
up a dialog with settings for that station.

This is where you could edit the station location,
water surface type, ice information, transducer

depth, screening distance, coordinate system
or profile extrapolation method.

-The Time Series Tab will allow you to quickly
review parameters from each station plotted

together in one view.

-These parameters could include vertical beam
and bottom depths, water temperature, pitch

and roll, battery voltage, profiling modes
and many other settings.

Again, look for consistency, values that are
reasonable based on the channel conditions

and a hydraulic knowledge of the station.

-When using the time series tab, be sure the
plots are scaled appropriately and be sure

to change the data being viewed by right clicking,
as needed.

A few examples of useful things to check here
are vertical beam depth versus bottom track

depth, instrument alignment and magnetic error.

-The Samples Tab is another quick way to check
each station for consistent processing settings

and data collection results.

-This table includes station information like
the coordinate system used for each.

You should also review other tabular data
like flow angle, number of cells, station

discharge, mean velocity and depth.

This table is customizable by right clicking
on the header.

Note the percent discharge is not computed
unless a rated discharge is entered in the

system tab.

-The Discharge Measurement Summary, accessed
by clicking this icon in the toolbar, is another

quick way of viewing lots of important measurement
details.

- Scan the system setup and discharge calculation
settings and the uncertainty values provided.

Look over the station details and ensure the
water surface type, temperatures, depths,

flow angles, and other fields are consistent
if you haven’t reviewed them already.

After conducting this preliminary review,
address any issues you might find, as needed.

Some issues may be resolved by simply changing
software settings or entries (such as an incorrectly

entered station location), but some issues
may require data to be re-collected.

Once the measurement has been satisfactorily
reviewed, save the discharge summary file

to import into SVMobile.

In the next screencast, we will show some
examples of issues commonly identified in

the RiverSuveyor Stationary Live software.