What s New in Hydroacoustics?

Transcription

1 What s New in Hydroacoustics? September 2008 Kevin Oberg With help from David Mueller, Chad Wagner, Ryan Jackson, Mike Rehmel, and Jon Czuba

2 What s New? Equipment Software Methods & Policy Publications Training RS Live, RiverRay, ADC WRII, new tools Moving bed tests, Other New reports Webinars, schedule for formal training courses, Web-based training

3 New SonTek YSI Profilers S5 Pre-release specs Subject to change 5-beam profiler 4 beam Janus configuration 3 Mhz Velocity profiling range ~0.2 m to 5.0 m 1 vertical beam for depth measurement 1 Mhz Range ~ m Units not available for sale Oct. 2008

4 New SonTek YSI Profilers M9 9-beam 3-frequency profiler 4 beams at 1 Mhz 4 beams at 3 Mhz khz (depth) Nominal velocity profiling range ~0.3 m 30.0 m Vertical beam range ~80m Units not available for sale Oct Pre-release specs Subject to change

5 Prototype ADP, GPS, & Float SonTek/YSI plans to offer a trimaran and their own monohull design, not necessarily similar to this monohull Pre-release specs Subject to change Units not available for sale Oct. 2008

6 Automatic Configuration Automatic velocity cell size adjustment Automatic switching between pulse-coherent and narrowband M9 profiler will switch between 1 and 3 Mhz on the fly

7 Software and Data Data are stored in profiler. Data viewed and profiler controlled with laptop and/or Windows Mobile device (Motorola Q Phone) Bluetooth or Freewave telemetry Pre-release specs Subject to change Units not available for sale Oct. 2008

8 Ott ADC

9 Comparison Qm s Site FlowT Q ADC Q % Diff. Comments Copper Slough Slight difference in XS-rod placement Palos Park High velocity fluctuations Oakwood Bismarck Small velocity fluctuations Joliet Flow angles? Coal City Horizontal velocity gradient/turbulence Flossmoor Low velocity spikes due to large cobbles (both FT and ADC) Oak Forest Large velocity gradient Mean -1.4

10 1.8 Lag in Velocity Due to Sampling Volume Velocity in feet/second Flowtracker Ott Stationing in feet

11 Sampling Volume FlowTracker Ott ADC

12 ADC Enhancements Compute/record/display flow angles Store velocity time series (not just final value) Provide software that supports analysis of above data Real time beam checks When point velocity measurement is invalid, prompt user for doing another velocity observation (at a different location) Working with Ott to implement enhancements

13 TRDI RiverRay Phased array transducer (flat face) 30-degree beams (larger unmeasured area) Single frequency 600 khz 2 prototypes delivered in September Units not available for sale as of Sept. 2008

14 TRDI RiverRay Integrated float with Bluetooth comms (default) Units not available for sale as of Sept. 2008

15 RiverRay Features Will default to an auto mode. Will consist of both pulse coherent (WM 5/11-like and incoherent modes (WM1) all at the same time Depth cell sizes will depend on depth and which mode is used to make the velocity measurement

16 Depth TRDI RiverRay Measurement Type Ambiguity resolution Depth cells/size < 0.6 m 3 pulse-coherent (PC) pings None 5 10 cm m m m Pulse coherent modes (WM 5/11 like) Attempt pulse-coherent; if not use mode 1/12 type mode 2 near-surface PC pings, Ambiguity ping + plus as many WM1-like pings as can be done to get 1-sec update rate Yes For PC mode 20 cm? 20 cm? 40 cm m Same as above? 80 cm This information is preliminary and subject to change

17 Use of Ultra- Mobile PCs Example UMPC with Wireless and Bluetooth Cost: ~$1,000 Instrument News article Sonny Anderson

18 High Speed Tethered Boat Noticed many problems in fast flows Air entrainment and/or ADCP being pulled out of the water RFP for a new boat is out.

19 RC Boat OceanScience Problems with High-speed boat - nose submerging in low velocities. Caused by deformation of plastic used. OS working on solution.

20 RC Boat SeaRobotics CA WSC using 2 boats for mapping applications. Still some work needed

21 WinRiver II Status Numerous bugs in version 2.02 OSW has tested several beta releases since early August. Program is more stable now; waiting on a final beta to test Release of 2.03 in November?

22 Communications OSW strongly encourages users to use USB-to-serial adapters with laptops even those that have a built-in RS-232 See Hydroacoustics Forums for info on suggested models ( HIF will stock a 2-port USB-to-serial adapter for purchase. Cost ~ $35.

23 MidSection Software Sontek Methods as documented by Sontek seem correct Limited testing has been done

24 MidSection (SxS) Software TRDI Some concerns about algorithms used in TRDI SxS software WRII 2.02 SxS can crash and user will be unable to resume Qm TRDI addressing technical concerns. Changes may appear in WRII version 2.03? Very limited testing

25 MidSection Software OSW strongly discourages use of homegrown SxS computations due to various possible technical problems such as: Flow angles Extrapolation Valid manual computations are time consuming and are difficult to check

26 Automated QA / QC

27 Automated QA / QC Prototype auto QA/QC delivered to TRDI and SonTek 18 months ago. Both vendors say they are committed to incorporating this into their software. TRDI has promised to focus on this in their first major update to WinRiver II in 2009 SonTek/YSI is incorporating some of this into RiverSurveyor-Live software

28 Extrapolation Analysis Tool

29 SMBA (Stationary Moving bed Analysis) Updated to process corrections from multiple moving bed tests Effectiveness of the approach used to do this is still being studied

30 LC (Loop Correction) LC Distributes loop correction across cross section based on near bed velocities Preferred loop correction method Improvements planned User interface Check quality of compass cal Report number of invalid ensembles

31 GPS Collect VTG & GGA VTG is Doppler-based measurement Less sensitive to multi-path effects Usually results in better quality data GGA VTG

32 Moving-Bed Tests USGS policy will require that a moving-bed test (MBT) be collected prior to every Qm No exceptions! Use the SMBA and LC software to analyze MBT s 560 feet in 540 s => 1 ft/s MB velocity

33 Moving-Bed Tests Three acceptable methods for performing a MBT 1. stationary test - no GPS 2. stationary test - with GPS, or 3. the loop method For stationary MBT s, we suggest multiple MBT s Flow D UP Deployment Tethered boat Anchored boat Boat with DGPS All other Duration of SMBT s 5 minutes 5 minutes 5 minutes 10 minutes

34 Moving-Bed Conditions Order of preference 1. DGPS 2. Loop correction method 3. Multiple stationary MBT s 4. Section by section software D UP Method Requirements DGPS Valid GPS data Valid Compass Calibration Loop Maintain BT Valid Compass Calibration SMBT s Remain stationary Valid BT for transects Midsection Use mfgr software

35 Current USGS Policy for Qm s USGS policy is that 4-transect mean is used as a measured discharge under steady flow conditions Policy was arrived at somewhat arbitrarily did not have a rigorous scientific basis Reflects need to have good spatial and temporal averaging

36 Number of Transects 28 comparisons having 12-transects were used 12-transect mean was assumed to be true Q Percent difference for 1-, 2-, 4-, 6- and 8-pass means computed Analysis

37 RG Exposure Time Analysis Percent Difference from 12-Pass Mean Oberg and Mueller (2007a). Validation of Streamflow Measurements Made with ADCPs. Journal of Hydraulic Engineering, 133(12), Duration in seconds

38 Exposure Time For ADCP Qm s Exposure time (D) is the total time spent sampling the flow Oberg and Mueller (2007) suggest that D is more important than number of transects for reducing uncertainty in Q OSW is conducting tests to validate this hypothesis

39 StreamPro Exposure Time

40 Validation Data Possible policy For steady flows, D must be 720 s & minimum of 2 transects

41 Discharge Measurement Manual Techniques and Methods Report Expected to be approved and published Oct-Dec 2008 Compilation of OSW technical memos, QA Plan, and Simpson report, plus new guidance Replacement for Simpson report

42 Capability Fact Sheet

43 Evaluation of GPS Receivers and VTG Report will be published in Selected results: Recommend use Novatel Smart Antenna or Hemisphere Crescent A100 Trimble AgGPS 132 and similar models have some known issues with VTG data Testing of these receivers is underway; Environment Canada uses Novatel Don t use handheld receivers

44 Using ADCPs in Moving Bed Conditions Web-based class has been developed Currently undergoing review / revision Should be available early in FY09 Will be offered via NTC / DOILearn Flow D UP

45 Status of Classes week classes taught annually! 7 Basic ADCP 2 Index Velocity 2 Refresher classes Classes are in high demand. Short courses at Data Conferences & elsewhere Possible velocity mapping / analysis class in late 2009

46 Proposed Schedule Course ID USGS Classes Date Location SW1321 Streamflow Measurements Using ADCP's 10/27/08 Louisville, KY SW1319 Streamflow Record Computation using ADVM's and Index-velocity Methods 11/18/08 Denver, CO SW1321 Streamflow Measurements Using ADCP's 01/26/09 Houston, TX SW1321 Streamflow Measurements Using ADCP's 03/23/09 Orlando, FL SW2441 Introduction to WinRiver II and ADCP Refresher with StreamPro 05/04/09 Asheville, NC SW1321 Streamflow Measurements Using ADCP's (SonTek) 05/04/09 Louisville, KY SW1321 Streamflow Measurements Using ADCP's 05/18/09 Lowell, MA SW1319 Streamflow Record Computation using ADVM's and Index-velocity Methods 07/14/09 Denver, CO SW2441 Introduction to WinRiver II and ADCP Refresher with StreamPro 08/03/09 Portland, OR SW1321 Streamflow Measurements Using ADCP's 08/24/09 Portland, OR

47 Other Training Info Will be looking to add new Web-based classes, perhaps Key Concepts, Water Modes, etc. (costly) OSW has maintained their own training registration system. We will no longer use that system. Users will register via DOILearn. Supervisor approvals needed in timely manner if you want to get into the class

48 Questions?

49 SxS Changes Needed GPS Loop (1 and 2) after that multiple MBT s and SxS are even. If cannot BT GPS have to have good GPS and comp cal Loop must be able to BT and comp cal SMBT - Home-grown SxS Caveats about units not available for sale HIF Stocking USB-serial