Abstract
ABSTRACT Bujan, N.; Cox, R.; Lin, L.-C.; Ducrocq, C., and Hwung, H.-H., 2018. Semiautomatic digital clast sizing of a cobble beach, Nantian, Taiwan. Surface sediment data is scarce for beaches that are made of material close to the cobble size range, partly because of the difficulty of direct sampling for sediment size analysis. An object-detection tool for semiautomatic analysis of clast geometry, originally developed for riverbeds, was applied to the coarse-clastic beach of Nantian, Taiwan. Comparison of the software with digital point counts for the common size percentiles D5, D16, D30, D50, D70, D84, and D95 indicated an average coefficient of determination of 0.990 over 10 test pictures. The surface sediment was digitally sampled at three cross-shore locations along the beach: near the shoreline, on the steep part of the beach face, and on the beach crest. Clast-size distributions, including clast area and elongation ratio, were computed from the geometry of 1000 clasts for each location and the cros...
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