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）是一座泻湖型台礁，坐落于南回归线之上，地处大堡礁南部的摩羯-邦克尔海域。研究人员从砂质礁坪采集了5件表层样品，针对每件样品的粒度（grainsize）与分选系数（sorting coefficient，以粒度标准差（standard deviation）表征）开展分析。此类沉积物多为源自高能迎风礁坪、经搬运再沉积的破碎物质。该沉积物属于中等分选的粗砂，磨圆度介于中等至良好之间。当从迎风砂质礁坪（样品S57）向背风区域（样品CE）移动时，可观察到沉积物成熟度逐渐升高。