中国海洋大学学报（自然科学版）2025，Vol.55Issue(12)：115-125,11.DOI:10.16441/j.cnki.hdxb.20250043
河床低渗透层影响下感潮河流-地下水交换研究
Tidal Fluid-Groundwater Exchange Under the Influence of Low Permeability Layer of Riverbed
摘要
Abstract
In the area where the river enters the sea,due to the weak hydrodynamic strength of the river and the water upstream,the fine suspended matter carried by the river forms a low permeability covering layer on the river bed surface,thus limiting the water-salt interaction between the river and groundwater.The in-depth study on the exchange of water and salt between tidal river flow and groundwater under the influence of low permeability silt layer has important scientific significance and application value for the utilization and protection of coastal groundwater resources.Taking the Dagu River estuary area of Shan-dong Peninsula as the study area,a site-scale groundwater numerical model is established on the basis of on-site hydrogeological investigation and monitoring.The groundwater salt dynamics characteristics and the fluxes of tidal river-groundwater water and salt exchange under the influence of low permeability silt layer on the river bed surface are studied for the first time.The effect of permeability and thickness change of low permeability layer on tidal river-groundwater exchange process is quantitatively analyzed.The research shows that under different conditions of low permeability layer,the length of the saline wedge increases and the regression rate of the saline wedge decreases at the initial stage,and gradually reaches the minimum value after about 100 days,then the length of the saline wedge suddenly decreases and the regression rate of the saline wedge increases rapidly,and the regression rate gradually becomes stable after about 600 days.In addition,the fluxes of river-groundwater water and salt exchange show periodic changes,and the fluxes of river-groundwater water and salt exchange decrease with the decrease of permeability or the increase of thickness of the low permeability layer.关键词
河流-地下水水盐交换通量/感潮河流/河床低渗透层/数值模拟Key words
river-groundwater water and salt exchange flux/tidal river flow/low permeability layer of riverbed/numerical simulation分类
环境科学引用本文复制引用
吴越,郑天元,张博,高晨晨,郑西来..河床低渗透层影响下感潮河流-地下水交换研究[J].中国海洋大学学报（自然科学版）,2025,55(12):115-125,11.基金项目
国家自然科学基金项目(42202270,42422207)资助 Supported by the National Natural Science Foundation of China(42202270,42422207) （42202270,42422207）
