Combining fixed‐ and moving‐vessel acoustic Doppler current profiler measurements for improved characterization of the mean flow in a natural river

[1] A methodology is presented to quantify the mean flow field in a natural river with a boat-mounted acoustic Doppler current profiler (ADCP). Moving-vessel (MV) and fixed-vessel (FV) survey procedures are used in a complementary fashion to provide an improved representation of mean three-dimensional velocity profiles along a cross section. Mean velocity profiles determined with FV measurements are rotated to a stream-fitted orthogonal coordinate system. The orientation of the coordinate system is established using MV measurements. The methodology is demonstrated using measurements obtained at two study sites on the lower Roanoke River for the mean annual flow (228 m3 s−1) and a flow that produces bankfull conditions at the sites (565 m3 s−1). Results at a meander bend identify well-known flow features, including a main circulation cell, outer-bank circulation, and separation at the inner bank. This methodology also provides a framework for comparing time-averaged velocity profiles from FV measurements with spatially averaged profiles from MV measurements. Results indicate that MV measurements can provide a reasonable estimate of the streamwise velocity at many locations. The MV measurements obtained here, however, were not sufficient to resolve the spanwise velocity component.

[1]  P. Julien,et al.  Direct measurements of secondary currents in a meandering sand-bed river , 1985, Nature.

[2]  M. Simpson,et al.  Discharge-measurement system using an acoustic Doppler current profiler with applications to large rivers and estuaries , 1992 .

[3]  Colin D. Rennie,et al.  Measurement of bed load velocity using an acoustic Doppler current profiler , 2002 .

[4]  M. Gutierrez,et al.  Comparison of testing techniques and models for establishing the SWCC of riverbank soils , 2010 .

[5]  Syunsuke Ikeda,et al.  Flow and Bed Topography in Curved Open Channels , 1976 .

[6]  M. Gordon Wolman,et al.  Flow resistance in sinuous or irregular channels , 1960 .

[7]  D. S. Mueller,et al.  Validation of Streamflow Measurements Made with Acoustic Doppler Current Profilers , 2007 .

[8]  M. Simpson,et al.  Discharge measurements using a broad-band acoustic Doppler current profiler , 2002 .

[9]  K. Blanckaert.  Hydrodynamic processes in sharp meander bends and their morphological implications , 2011 .

[10]  W. Dietrich,et al.  Influence of the point bar on flow through curved channels , 1983 .

[11]  Panayiotis Diplas,et al.  Application of two- and three-dimensional computational fluid dynamics models to complex ecological stream flows , 2008 .

[12]  P. Carling,et al.  Advances in fluvial dynamics and stratigraphy , 1996 .

[13]  D. Benson,et al.  Particle tracking and the diffusion‐reaction equation , 2013 .

[14]  Philip A. Townsend,et al.  Bank erosion along the dam-regulated lower Roanoke River, North Carolina , 2009 .

[15]  H. J. De Vriend,et al.  Flow measurements in a curved rectangular channel , 1979 .

[16]  Stuart N. Lane,et al.  Secondary circulation cells in river channel confluences: measurement artefacts or coherent flow structures? , 2000 .

[17]  R. Dinehart,et al.  Averaged indicators of secondary flow in repeated acoustic Doppler current profiler crossings of bends , 2005 .

[18]  M. Muste,et al.  Practical aspects of ADCP data use for quantification of mean river flow characteristics; Part I: moving-vessel measurements , 2004 .

[19]  R. Nanson.  Flow fields in tightly curving meander bends of low width‐depth ratio , 2009 .

[20]  Daniel R. Parsons,et al.  Comparison of fixed- and moving-vessel flow measurements with an aDp in a large river , 2007 .

[21]  S. Lane,et al.  Flow in meander bends with recirculation at the inner bank , 2003 .

[22]  A. Sukhodolov.  Structure of turbulent flow in a meander bend of a lowland river , 2012 .

[23]  R. Tsubaki,et al.  New 3‐D flow interpolation method on moving ADCP data , 2012 .

[24]  M. Gutierrez,et al.  Determination of the shear strength of unsaturated soils using the multistage direct shear test , 2011 .

[25]  M. Gutierrez,et al.  Data evaluation for acoustic Doppler current profiler measurements obtained at fixed locations in a natural river , 2013 .

[26]  M. Guerrero,et al.  Flow Field and Morphology Mapping Using ADCP and Multibeam Techniques: Survey in the Po River , 2011 .

[27]  Iehisa Nezu,et al.  Three-dimensional turbulent structure in straight open channel flows , 1989 .

[28]  Prediction of the three-dimensional flow field and bed shear stresses in a regulated river in mid-Norway , 2010 .

[29]  Koen Jacques Ferdinand Blanckaert,et al.  Mean Flow and Turbulence in Open-Channel Bend , 2001 .

[30]  R. Lee Gordon,et al.  Acoustic Measurement of River Discharge , 1989 .

[31]  David S. Mueller,et al.  Measuring Discharge with Acoustic Doppler Current Profilers from a Moving Boat , 2014 .

[32]  P. Diplas,et al.  Modeling Unsteady Flow Characteristics of Hydropeaking Operations and Their Implications on Fish Habitat , 2010 .

[33]  Colin D. Rennie,et al.  Mapping spatial distributions and uncertainty of water and sediment flux in a large gravel bed river reach using an acoustic Doppler current profiler , 2010 .

[34]  I. L. Rozovskii,et al.  Flow of water in bends of open channels , 1957 .

[35]  R. Jacobson,et al.  3‐D flow and scour near a submerged wing dike: ADCP measurements on the Missouri River , 2011 .