高校地质学报2026，Vol.32Issue(4)：547-560,14.DOI:10.16108/j.issn1006-7493.2025042
钱塘江河口区表层沉积物粒度端元提取及其展布特征
Extraction and Distribution Patterns of Grain-size End-members for the Surface Sediments in the Qiantang River Estuary District
摘要
Abstract
The surface sediment grainsize data from the Qiantang River estuary is investigated using the End-member Modeling Algorithm and a non-parametric estimation decomposition algorithm.In order to characterize the compositional features and planar distribution patterns of different grainsize endmembers,and explore their coupling relationships with sediment provenance and environmental changes.Results show that the data obtained by algorithms have good consistency,however,the End-member Modeling Algorithm demonstrate superior performance in accurately identifying unimodal distributions of each endmember.Surface sediments of the Qiantang River estuary can be divided into five grain-size end-members:EM1(clay and silt),EM2(coarse silt and very coarse silt),EM3(very fine sand and fine sand),EM4(fine sand and medium sand),and EM5(medium sand and coarse sand).EM1 and EM2 represent the suspended sediments transported over long distances,primarily derived from the Yangtze River(Changjiang).EM3,distributed in the estuary mouth,indicates the reworking of residual sands from the Yangtze River estuary.EM4 denotes fluvial sandy sediments transported over a relatively long distance,while EM5 represents very coarse fluvial sand transported over a short distance;both primarily originate from the upper reaches of the Qiantang River and its tributaries.This study demonstrates that for estuarine sedimentary environments with complex source-to-sink systems,the End-member Modeling Algorithm enhances the resolution and efficiency of grain-size analysis and can sensitively indicate hydrodynamic conditions,source-to-sink processes,and event deposits.Therefore,this method holds promise for application in analyzing diverse and complex source-to-sink systems and hydrodynamic conditions in similar estuarine regions worldwide.关键词
钱塘江河口区/敏感粒级/端元模型/物源体系/沉积过程Key words
Qiantang River estuary/sensitive grain size/end-member modeling/source-to-sink system/sedimentary process分类
海洋科学引用本文复制引用
余力涵,范代读,王军,林春明,王博,苏建锋,张霞,王瑾,南风..钱塘江河口区表层沉积物粒度端元提取及其展布特征[J].高校地质学报,2026,32(4):547-560,14.基金项目
国家自然科学基金(42172107 （）
42172105 （）
41772097)和南京大学大学生创新训练计划项目(202410284384X)联合资助 （202410284384X）
