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New 3‐D flow interpolation method on moving ADCP data
Author(s) -
Tsubaki R.,
Kawahara Y.,
Muto Y.,
Fujita I.
Publication year - 2012
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2011wr010867
Subject(s) - acoustic doppler current profiler , interpolation (computer graphics) , bathymetry , kriging , geology , vector field , flow (mathematics) , flow velocity , turbulence , algorithm , geodesy , mathematics , geometry , current (fluid) , meteorology , computer science , physics , statistics , animation , oceanography , computer graphics (images)
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.