Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Validation of Assessment for Mean Flow Field Using Spatial Averaging of Instantaneous ADCP Velocity Measurements

ADCP 자료의 공간평균을 이용한 평균유속장 산정에 대한 검증

  • Kim, Dong-Su (Department of Civil & Environmental Engineering, Dankook University) ;
  • Kang, Boo-Sik (Department of Civil & Environmental Engineering, Dankook University)
  • 김동수 (단국대학교 토목환경공학과) ;
  • 강부식 (단국대학교 토목환경공학과)
  • Received : 2010.10.21
  • Accepted : 2010.12.09
  • Published : 2011.01.31
Download PDF
⟨ Previous Next ⟩

Abstract

While the assessment of mean flow field is very important to characterize the hydrodynamic aspect of the flow regime in river, the conventional methodologies have required very time-consuming efforts and cost to obtain the mean flow field. The paper provides an efficient technique to quickly assess mean flow field by developing and applying spatial averaging method utilizing repeatedly surveyed acoustic Doppler current profiler(ADCP)'s cross-sectional measurements. ADCP has been widely used in measuring the detailed velocity and discharge in the last two decades. In order to validate the proposed spatial averaging method, the averaged velocity filed using the spatial averaging was compared with the bench-mark data computed by the time-averaging of the consistent fix-point ADCP measurement, which has been known as a valid but a bit inefficient way to obtain mean velocity field. The comparison showed a good agreement between two methods, which indicates that the spatial averaging method is able to be used as a surrogate way to assess the mean flow field. Bed shear stress distribution, which is a derived hydrodynamic quantity from the mean velocity field, was additionally computed by using both spatial and time-averaging methods, and they were compared each other so as to validate the spatial averaging method. This comparison also gave a good agreement. Therefore, such comparisons proved the validity of the spatial averaging to quickly assess mean flow field. The mean velocity field and its derived riverine quantities can be actively used for characterizing the flow dynamics as well as potentially applicable for validating numerical simulations.

Keywords

References

  1. Carr, M. L., Rehmann, C. R, 2005, Estimating the dispersion coefficient with an acoustic Doppler current profiler, Proc., World Water and Environmental Resources Congress 2005 (CD-ROM), ASCE, Reston, VA.
  2. Chanson, H., 2000, Boundary shear stress measurements in undular flows: Application to standing wave bed forms, Water Resources Research, 36(10), 3063-3076. https://doi.org/10.1029/2000WR900154
  3. Dinehart, R. L., Burau, J. R., 2005, Averaged Indicators of Secondary Flow in Repeated Acoustic Doppler Current Profiler Crossings of Bends, Water Resources Research., 41, W09405, doi:10.1029/2005WR004050.
  4. Gaeuman, D., Jacobson, R. B., 2005, Aquatic habitat mapping with an acoustic current profiler: Considerations for data quality, Open-file Report 2005-1163, U.S. Geological Survey, Reston, VA.
  5. Gordon, R. L., 1989, Acoustic Measurement of River Discharge, Journal of Hydraulic Engineering, 133(12), 1297-1299.
  6. Howarth, M. J., 2002, Estimates of Reynolds and bottom stress from fast sample ADCPs deployed in continental shelf seas, Proc., Hydraulic Measurements & Experimental Methods 2002 (CD-ROM), ASCE, Reston, VA.
  7. Kim, D., Muste, M., Weber, L., 2007, Software for Assessment of Longitudinal Dispersion Coefficient using Acoustic-Doppler Current Profiler Measurements, XXXII International Association of Hydraulic Engineering and Research Congress, Venice, Italy.
  8. Kim, D., Muste, M., Weber, L., Asman, R., 2007, Getting to Know AdcpXP - A tutorial for using AdcpXP. User Manual, IIHR - Hydroscience & Engineering, Iowa City, IA.
  9. Kostaschuk, R., Villard, P., Best, J., 2004, Measuring velocity and shear stress over dunes with acoustic Doppler profiler, Journal of Hydraulic Engineering, 130(9), 932-936.
  10. Lu, Y., Lueck, R. G., 1999b, Using broadband ADCP in a tidal channel. Part II: Turbulence, Journal of Atmospheric and Oceanic Technology, 16, 1568-1579. https://doi.org/10.1175/1520-0426(1999)016<1568:UABAIA>2.0.CO;2
  11. Muste, M., Yu, K., Pratt, T., Abraham, D., 2004, Practical aspects of ADCP data use for quantification of mean river flow characteristics: part II: Fixed-vessel measurements, Journal of Flow Measurement and Instrumentation, 15(1), 17-28. https://doi.org/10.1016/j.flowmeasinst.2003.09.002
  12. Muste, M., Kim, D., Gonzalez-Castro, J., Burkhardt, A., Brownson, Z., 2006, Near-Transducer Errors in Acoustic Doppler Current Profiler Measurement, World Environmental and Water Resources Congress 2006, Omaha, Nebraska.
  13. Muste, M., González-Castro, J. A., Yu, K., Kim, D., 2007, Accuracy of ADCP discharge measurements for rating of flow-control structures, IIHR Report, IIHR-Hydroscience & Engineering, The University of Iowa, Iowa City, IA.
  14. Muste, M., Vermeyen, T., Hotchkiss, R., Oberg, K., 2007, Acoustic Velocimetry for Riverine Environments,” Journal of Hydraulic Engineering, 115, 925-936. https://doi.org/10.1061/(ASCE)0733-9429(1989)115:7(925)
  15. Nystrom, E. A., Oberg, K. A., Rehmann, C. R., 2002, Measurement of turbulence with acoustic Doppler current profilers sources of error and laboratory results, Proc., Hydraulic Measurements & Experimental Methods 2002 (CD-ROM), ASCE, Reston, VA.
  16. Rennie, C. D., Millar, R. G., Church, M. A., 2002, Measurement of bedload velocity using an acoustic Doppler current profiler, Journal of Hydraulic Engineering, 128(5), 473-483. https://doi.org/10.1061/(ASCE)0733-9429(2002)128:5(473)
  17. RDI, 1996, Acoustic Doppler Current Profilers Principle of operation, A Practical Primer. San Diego, RD Instruments, San Diego, CA.
  18. RDI, 2003, WinRiver User's Guide, RD Instruments, San Diego, CA
  19. Schemper, T. J., Admiraal, D. M., 2002, An examination of the application of acoustic Doppler current profiler measurements in a wide channel of uniform depth for turbulence calculations, Proc., Hydraulic Measurements & Experimental Methods 2002 (CD-ROM), ASCE, Reston, VA.
  20. Shields, F. D., Knight, S. S., Church, M. A., 2003, Use of acoustic Doppler current profilers to describe velocity distributions at the reach scale, Journal of the Atmosphere and Water Resources Association, 39(6), 1397-1408. https://doi.org/10.1111/j.1752-1688.2003.tb04426.x
  21. Sime, L. C., Ferguson, R. I., Church, M., 2007, Estimating shear stress from moving boat acoustic Doppler velocity measurements in a large gravel bed river, Water Resources Research, 43: W03418, doi: 10.1029/2006WR005069.
  22. Simpson, M. R., Oltmann, R. N., 1993, Dischargemeasurement system using an acoustic Doppler current profiler with applications to large rivers and estuaries. Water-Supply Paper 2395, U.S. Geological Survey, Denver, CO.
  23. SonTek, 2000, Doppler Velocity Log for ROV/AUV Applications. SonTek, San Diego, CA.
  24. Stacey, M. T., Monismith, S. G., Burau, J. R., 1999, Observations of turbulence in partially stratified estuary, Journal of Physical Oceanography, 29, 1950-1970. https://doi.org/10.1175/1520-0485(1999)029<1950:OOTIAP>2.0.CO;2
  25. Szupiany, R. N., Amsler M. L., Best, J. L., Parsons, D. R., 2007, A Comparison of Fixed- and Movingvessel flow measurements with an acoustic Doppler profiler (aDp) in a large river, Journal of Hydraulic Engineering, 133(12), 1299-1309. https://doi.org/10.1061/(ASCE)0733-9429(2007)133:12(1299)
  26. Wilcock, P. R., 1996, Estimating local bed shear stress from velocity observations, Water Resources Research, 32(11), doi:10.1029/96WR02277.
  27. White, F. M., 2003, Fluid Mechanics fifth edition, McGraw-Hill, New York, NY.

Cited by

  1. Accuracy Analysis of Velocity and Water Depth Measurement in the Straight Channel using ADCP vol.48, pp.5, 2015, https://doi.org/10.3741/JKWRA.2015.48.5.367
  2. Estimation of Net Flux of Water Mass and Tidal Prism at a Tidal Entrance through Bottom Tracking with ADCP vol.28, pp.3, 2016, https://doi.org/10.9765/KSCOE.2016.28.3.160