海洋地质与第四纪地质2023，Vol.43Issue(6)：69-73,5.DOI:10.16562/j.cnki.0256-1492.2023082901
海滩也缺乏砂-砾过渡粒级的沉积物
The grain size gap at gravel-sand transition in beach sediments
摘要
Abstract
The grain size of sediments is one of the most crucial sedimentary parameters.In riverbeds,the surface sediments often lack the transitional grain sizes between sand and gravel(i.e.,1～10 mm),a phenomenon widely referred to as the"grain size gap."Whether this is also the case for beach sediments remains a fundamental yet unexplored question.Through the analysis of mean grain size data from 228 beach locations globally,we revealed that beaches also exhibit a grain size gap of sand-gravel transition,ranging from-3.5ϕto-1ϕ(2 to 11 mm).Beaches have a high probability of being either gravel beaches with mean sediment diameters of several tens of millimeter,or sand beaches with mean sediment diameters of several hundred micrometers,mirroring the findings in riverbeds.Potential reasons for this absence include particle abrasion and selective transportation.关键词
海滩/沉积物粒径分布/砂-砾过渡粒级缺乏/物源性质/输运过程/物质收支Key words
beaches/grain size distributions/grain size gap/material source/transport processes/sediment budgeting分类
海洋科学引用本文复制引用
于谦,贾建军,高抒..海滩也缺乏砂-砾过渡粒级的沉积物[J].海洋地质与第四纪地质,2023,43(6):69-73,5.基金项目
国家自然科学基金"牡蛎礁多尺度沉积动力过程与地貌演化"(42076172) （42076172）
2023江苏省自然资源发展专项资金(海洋科技创新)项目(JSZRHYKJ202303) （海洋科技创新）
