Grainsize of surface samples collected from the sanded reef flat physiographic zone of Wistari Reef

Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef. Five surface samples were taken from the sanded reef flats and analysed to determine grainsize and the sorting coefficient (expressed as the standard deviation of grainsize) within each sample. These sediments tend to consist of broken and reworked material that is derived and transported from the high energy windward reef flat. The sediments are moderately sorted coarse sand, and vary from moderately to well rounded. Increasing maturity of the sediment is observed, as one moves from the windward sanded reef flats (sample S57) toward the leeward region (sample CE).

威斯塔里礁（Wistari Reef）是一座泻湖型台地礁，坐落于南回归线之上，地处大堡礁南部的摩羯座-邦克尔海区。研究人员从沙质礁坪采集了5份表层沉积物样品，通过分析测定了每份样品内的沉积物粒度（grainsize）与分选系数（sorting coefficient，以粒度标准差表征）。该套沉积物多由经破碎、再搬运的物质组成，其物源与搬运路径均来自高能向风礁坪。该套沉积物为中等分选的粗砂，磨圆度从中等到良好不等。随着从向风沙质礁坪（样品S57）向背风区域（样品CE）移动，可观测到沉积物成熟度（sediment maturity）逐渐升高。