RIVER BED SURFACE ROUGHNESS ANALYSIS USING 2-D WAVELET TRANSFORM-BASED METHODS

Abstract eng:
This paper describes the analysis of river bed sediment surface data using the two-dimensional discrete wavelet transform. When sedimentation occurs in a channel the topography of the bed surface will change which in turn will affect the flow characteristics. It is therefore important to be able to characterise the bedsurface topography. In this study the sediment surface data was analysed using the wavelet transform - a relatively new mathematical tool for data analysis. Interest in this analysis method has increased during recent years, and today it can be found in a number of areas in both science and engineering. The sediment data set was decomposed into a range of scales using the Daubechies 12 wavelet for the analysis. By determining the energy in the scale ranges a novel distribution, the form size distribution, of the bed forms was computed.

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