地质论评2026，Vol.72Issue(5)：1501-1514,14.DOI:10.16509/j.georeview.2026.01.012
长江口晚更新世以来的弱透水层含水率特征及其环境指示意义
Moisture content characteristics of aquitards since the Late Pleistocene in the Yangtze River estuary and its environmental indication significance
摘要
Abstract
Objectives:The dry wet characteristics of aquitards have environmental indicative significance and are key parameters affecting soil engineering geological characteristics.Therefore,studying the response mechanisms of soil moisture characteristics to paleoclimate and paleoenvironment since the Late Pleistocene is of significant importance. Methods:2787 water content samples were collected and tested for liquid limit,plastic limit,and particle size in the Yangtze River Estuary area.Based on the drawn water content geological profile combined with dating data,grain size data,lithology,color,water content etc.,perform paleoclimate and paleoenvironment inversion since the Late Pleistocene. Results:The results indicate that the lithology of the Qp31 aquitard is mainly silty clay,with a color of yellow gray,which is a coastal sedimentary facies with an average water content of 28.4％and high spatial variability in the Yangtze River Estuary area.The lithology of the first hard soil layer in Qp32 is mainly composed of silty clay,with a grayish yellow color.It is deposited in the river floodplain facies,with an average water content of 28.5％.The Qh aquitards can be classified as silty clay,clay(in small amounts),and soft soil,all of which are reduced in color except for the surface soil.Among them,soft soil has high water content characteristics,which are greater than 32％. Conclusions:The water content of the first hard soil layer shows an increasing trend with depth,indicating that the climate gradually becomes cooler and drier from bottom to top.The Qh aquitard has a high water content,which is mainly related to the warm and humid climate.Part of the middle and deep Qh aquitards have low water content,even below 25％,which is related to cold events such as 8.2 ka BP,5.5 ka BP,4.2 ka BP,and 2.8 ka BP.The water content of Qh deep aquitards are significantly negatively correlated with burial depth and distance from the coastline,indicating that the newer the sedimentary age of the soil and the shorter the distance from the coastline,the higher the water content of the soil.关键词
含水率/黏性土/软土/古土壤/第一硬土层Key words
water content/clayey soil/soft soil/paleosol/first hard soil layer引用本文复制引用
苟富刚,龚绪龙,程瑜..长江口晚更新世以来的弱透水层含水率特征及其环境指示意义[J].地质论评,2026,72(5):1501-1514,14.基金项目
本文为省市合作项目"江苏省典型生态功能区主要生态地质问题调查与安全评价"(编号:苏财资环[2024]33号)、中国地质调查局项目(编号:1212011220005)、江苏省自然资源科技项目(编号:JSZRKJ202502)和国家自然科学基金资助项目(编号:42007402)的成果. This study was financially supported by Investigation and Safety Evaluation of Major Ecological Geological Issues in Typical Ecological Function Zones of Jiangsu Province(No.SUCAIZIHUAN[2024]33),China Geological Survey Project(No.1212011220005),Jiangsu Province Natural Resources Science and Technology Project(No.JSZRKJ202502),National Natural Science Foundation of China Project(No.42007402) （编号:苏财资环[2024]33号）
