A pattern matching technique for measuring sediment displacement levels
Munro, Richard J. and Dalziel, Stuart B. and Jehan, H. (2004) A pattern matching technique for measuring sediment displacement levels. Experiments in Fluids, 37 (3). pp. 399-408. ISSN 0723-4864
Official URL: http://dx.doi.org/10.1007/s00348-004-0829-8
This paper describes a novel technique for obtaining accurate, high (spatial) resolution measurements of sediment redeposition levels. A sequence of different random patterns are projected onto a sediment layer and captured using a high-resolution camera, producing a set of reference images. The same patterns are used to obtain a corresponding sequence of deformed images after a region of the sediment layer has been displaced and redeposited, allowing the use of a high-accuracy pattern matching algorithm to quantify the distribution of the redeposited sediment. A set of experiments using the impact of a vortex ring with a glass ballotini particle layer as the resuspension mechanism are described to test and illustrate the technique. The accuracy of the procedure is assessed using a known crater profile, manufactured to simulate the features of the craters observed in the experiments.
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