《Table 1 Grain size distributions (GSDs) for the sediment samples used in the model tests》

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《Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency》

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15 GSD samples were collected from different debris flow events that primarily occurred in different area in China.They were divided into two groups with A1～A7 and B1～B9.The former samples were used for single-structure tests and the latter for two-structure tests.Considering the scaling problems，only the solid phase of each GSD sample was considered based on the two-phase flow theory（Fei et al.1991；Shu et al.2008）.The maximum grain size diameter was set at 60 mm，and 2 mm was used as the minimum diameter of the solid phase.Over the grain size range，five grain size classes were considered that comprised the intervals of 60-40 mm，40-20 mm，20-10 mm，10-5mm，and 5-2 mm（Figure 1 and Table 1）.This consideration is rational because HWSSSs are primarily intended to separate coarse debris that causes harmful damage.