1 / 25

J. Chen, J. Fooks and H. Goertz Water Survey Division Environment Canada 2008.05

Stage-Discharge Rating with ADCP Measurements. 4 th International Symposium on Flood Defence : Managing Flood Risk, Reliability and Vulnerability, Toronto, Ontario, Canada, May 6-8, 2008. J. Chen, J. Fooks and H. Goertz Water Survey Division Environment Canada 2008.05.

nelson
Download Presentation

J. Chen, J. Fooks and H. Goertz Water Survey Division Environment Canada 2008.05

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stage-Discharge Rating with ADCP Measurements 4th International Symposium on Flood Defence: Managing Flood Risk, Reliability and Vulnerability, Toronto, Ontario, Canada, May 6-8, 2008 J. Chen, J. Fooks and H. Goertz Water Survey Division Environment Canada 2008.05

  2. Presentation Outline Introduction Discharge measurement techniques ADCP data analysis Stage-discharge rating Conclusions

  3. Water Survey of Canada

  4. Discharge Measurement with Traditional Techniques

  5. Limitations of Current Meter Measurement Discrete points and assumed vertical velocity profile Limited range of velocity (>6 cm/s) Time consuming Safety concerns

  6. Discharge Measurement with Acoustic Techniques

  7. Advantages of Acoustics Techniques Continuous velocity profiling with directional capability Extended range of velocity measurement Shortened field measurement time Ability to correct data files in post-processing Safety concerns decreased

  8. Discharge Measurement with ADCP From USGS report

  9. Discharge Measurement with ADCP (Cont’d)

  10. Velocity Magnitude Contour Discharge Measurement June 11, 2002

  11. Discharge Measurement with ADCP – 5 Components Top subsection Left bank subsection Channel subsection measurable with an ADCP Right bank subsection Bottom subsection

  12. Percentage of ADCP Measured Component Q

  13. Correlation Among Component Discharges (Q-Q) Pearson Correlation

  14. Correlation Analysis of Component Discharge (H-Q)

  15. Discharge Computation Methods • Standard stage-discharge rating • Non-standard methods for discharge computation • Index-velocity rating • Flow-velocity distribution

  16. Stage vs. Measured Q Rating

  17. Stage vs. Estimated Top, Bottom Components Q Rating

  18. Stage vs. Estimated Left, Right Components Q Rating

  19. Stage – Discharge RatingResults Comparison

  20. H&Q Rating with Single Transect Measurements • Discharge measurement from each transect is considered as an independent measurement • Significantly increase the number of measurements for rating curve development

  21. H&Q Rating with Single Transect Measurements

  22. Conclusions ADCP measurements with 5 components allow for exploration of disaggregated rating methods Component discharge rating It appears that H-Q rating quality does not vary significantly, regardless of whether discharge components are summed prior to rating calibration, or if individual component rating results are summed Component discharge percentages can provide future knowledge of error sources at particular sites

  23. Conclusions (Cont’d) Single transect analysis Using an average of 4 transects or individual transects does not significantly affect the H & Q rating accuracy Further study with rapidly changing stage could provide more depth to this analysis

  24. Comments on Stage Discharge Rating

  25. Comments on Stage Discharge Rating (Cont’d)

More Related