水利水电科技进展2025，Vol.45Issue(4)：24-30,7.DOI:10.3880/j.issn.1006-7647.2025.04.004
潮汐影响下江底富水砂层地下水运动单孔示踪测试研究
Single-borehole tracer detection of groundwater movement in water-rich sand layer under riverbed impacted by sea tide
摘要
Abstract
To address the complicated groundwater seepage conditions in water-rich sand layer under riverbed influenced by sea tide,the single-borehole dilution method was employed to measure both vertical and horizontal groundwater flow velocities within boreholes,so as to determine the groundwater movement patterns under the fluctuation of river stage.Field test results indicate that the fluctuation of river stage has little impact on the groundwater seepage on both banks,but has great impact on that of alluvial sand bar.If the river stage decreases,the water level of alluvial sand bar will be higher than the river water level,resulting in downward vertical flow in the boreholes.Conversely,when the river stage rises,the water level of alluvial sand bar will be lower,leading to upward vertical flow in the boreholes.The upper silty sand layer of the formation has a certain degree of impermeability,weakening the influence of river water on the deeper strata.As a result,there is no obvious vertical flow in the underlying sand and pebble layer,in which the maximum horizontal flow velocity is as low as 0.48 m/d and will be in favor of the implement of the freezing method.关键词
潮汐影响/富水砂层/地下水运动/单孔示踪Key words
impact of tide/water-rich sand layer/groundwater movement/single-borehole tracer分类
天文与地球科学引用本文复制引用
董海洲,王晋健,林建忠,黄婷婷,刘星平,喻成..潮汐影响下江底富水砂层地下水运动单孔示踪测试研究[J].水利水电科技进展,2025,45(4):24-30,7.基金项目
湖南省水利科技项目(XSKJ2024064-23) （XSKJ2024064-23）
