HR: 0830h
AN: OS41C-0818    [PDF]
TI: Multiresolution Interpolation and Detiding of the ADCP data
AU: * Chiao, L
EM: chiao@ntu.edu.tw
AF: Institute of Oceanography, National Taiwan University, #1, sec 4, Rosevelt Rd, Taipei, 106 Taiwan
AU: Wang, Y
EM: yhwang@ntu.edu.tw
AF: National Center for Ocean Research, #1, sec 4, Rosevelt Rd, Taipei, 106 Taiwan
AB: To account for the uneven sampling of current measurements collected by acoustic Doppler current profilers, we propose a robust, three-dimensional interpolation scheme based on the multiresolution representation of the regional mean and tidal current fields. Instead of reconstructing the tidal field by getting bin-averaged time series that relies on heavy sampling or invoking radial basis function expansion, such as using the biharmonic splines with subjectively selected knots, the resolving capability of the proposed scheme relies fundamentally on the scale hierarchy of the resolvable local information constrained by the data. We demonstrate that the proposed scheme flexibly incorporates merits of the two conventional techniques. It enforces the resolution of model information while accommodating the local sampling density. Since it is based on knots network defined by regular grids, efforts of experimentally and subjectively constructing the proper number and locations of controlling nodes are avoided. Constructing multiresolution representation of the current fields in terms of the three-dimensional wavelet basis is implemented by computationally effective discrete wavelet transform of coefficients of the interpolation equations. Applications of the proposed multiresolution scheme on artificial as well as field data sets of the ADCP measurements demonstrates that it is a promising approach.
DE: 4200 OCEANOGRAPHY: GENERAL
DE: 4299 General or miscellaneous
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting