New 3-D flow interpolation method on moving ADCP data

Tsubaki Ryota

Kawahara Yoshihisa

Muto Yasunori

Fujita Ichiro

Water Resources Research

A simple but accurate interpolation procedure for obtaining the three-dimensional distribution of three-component velocity data, from moving acoustic doppler current profiler (ADCP) observation data, is proposed. For understanding actual flow structure within a river with complex bathymetry, the three-dimensional mean velocity field provides a basic picture of the flow. For obtaining the three-dimensional distribution of three-component velocity data, in this work, anisotropic gridding was introduced in order to remove the random component of measured velocity data caused by the turbulence of the flow and measurement error. A continuity correction based on the pressure equation was used to reduce both random and systematic errors. The accuracy of the developed method was evaluated using three-dimensional flow simulation data from a detached-eddy simulation (DES). By using the procedure developed, the complex flow structure surrounding the spur dikes section in the Uji River was successfully visualized and explored. The proposed method shows superiorities in both accuracy and consistency for the interpolated velocity field, as compared to the kriging and inverse-distance weighted (IDW) methods.

acoustic-doppler current profilers

groin

interpolation

river flow

velocity distribution

vortex core

Construction. Civil engineering [ 510 ]

eng

American Geophysical Union.

Copyright 2012 American Geophysical Union. All Rights Reserved.

[ISSN] 0043-1397

[DOI] 10.1029/2011WR010867

[NCID] AA0088653X

[DOI] http://dx.doi.org/10.1029/2011WR010867