鄱阳湖沙岭沙山沉积物粒度特征及其影响因素  

Grain Size Characteristics and Influencing Factors of Sediments in the Shaling Sand Hill around Poyang Lake

作　　者：耿嘉慧 杜丁丁 吴汪洋 李志文 戴友为 高斌 GENG Jiahui;DU Dingding;WU Wangyang;LI Zhiwen;DAI Youwei;GAO Bin(School of Earth Sciences,East China University of Technology,Nanchang 330013,China;School of Environment and Chemical Engineering,Foshan University,,Foshan 528225,China)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]佛山大学环境与化学工程学院,广东佛山528225

出　　处：《内蒙古大学学报(自然科学版)》2025年第1期55-68,共14页Journal of Inner Mongolia University:Natural Science Edition

基　　金：江西省大气污染成因与控制重点实验室开放基金项目(AE2105)。

摘　　要：鄱阳湖位于亚热带湿润气候区,湖周广泛发育多处大型沙山,一直为研究的热点区域。然而,已有的研究多侧重于过去风沙活动,缺少对现代风沙活动的研究,鄱阳湖周边现代风沙活动强烈,分析沙山不同高度现代沉积物粒度特征,有助于探讨其垂直分布规律与影响因素,为风沙治理提供科学依据。因此,本文选取庐山市星子镇沙岭沙山为研究对象,采用粒度和端元模型进行研究,结果表明:(1)沙岭沙山沉积物主要由中砂、细砂和粗砂组成,中砂含量最高,占总量的49.52%,平均粒径为2.15Ф,分选程度较差,呈极正偏和很窄峰态分布;(2)从沙山坡脚至坡顶,随高度升高,沙山沉积物细颗粒含量波动式上升,粗颗粒含量波动式下降,平均粒径呈粗-细-粗变化,分选性由好-差-好变化,偏度由小-大-小变化,峰态逐渐趋向极窄;(3)沉积物粒度随高度变化,坡顶主要与风力搬运能力强弱有关,坡中主要受植被覆盖影响,坡脚受重力堆积作用显著;利用概率累积曲线得出沉积物搬运方式以跃移为主。Poyang Lake is situated within the subtropical humid climate zone,and it is surrounded by extensive sand hills that have attracted significant research attention.However,previous studies have predominantly focused on historical aeolian activities,neglecting investigations into modern aeolian activities.The modern aeolian activities around Poyang Lake are strong.Analyzing the grain size characteristics of modern sediments at various heights of the sand hills can facilitate an exploration of their vertical distribution patterns and underlying factors,providing scientific foundation for managing aeolian activities.Therefore,Shaling sand hill in Xingzi County,Lushan City was selected as the research object in this paper.The investigation employed grain size analysis and end-element modeling as research methods.The results showed that:(1)The sediment composition of the Shaling sand hill primarily consist of medium sand,fine sand and coarse sand,with medium sand accounting for the highest proportion at 49.52%of the total content.The average grain size measures 2.15Φand exhibits poor sorting characteristics,an extremely positive skewness distribution,and very narrow kurtosis distribution.(2)The content of fine particles fluctuating and increases as the height ascends from the foot of the slope to the top of the sand hill,while there is a corresponding decline in the content of coarse particles.The average grain size exhibits a pattern of coarse-fine-coarse changes,with sorting transitioning from good to poor and then back to good.Additionally,skewness shows a progression from small to large and then back to small,while kurtosis gradually increases towards extremely narrow distribution.(3)The study indicates that sediment grain size exhibits vertical variation,with the upper part of the slope primarily influenced by wind transport,the middle section predominantly affected by vegetation cover,and the foot significantly affected by gravitational accumulation.Analysis of the probability accumulation curve suggests that sal

关 键 词：沙岭沙山 沉积物粒度 垂直分布 影响因素 鄱阳湖 

分 类 号：P931.3[天文地球—自然地理学]