泥质潮滩海水-地下卤水相互作用复杂模式初探  

Complex model of interaction between seawater and underground brine in muddy tidal flat

作　　者：张宇丰 邢程 郭秀军[1,2] 邵帅 付腾飞[4] 吴汉夫 ZHANG Yufeng;XING Cheng;GUO Xiujun;SHAO Shuai;FU Tengfei;WU Hanfu(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Key Laboratory of Shandong Province for Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China;Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China;Key Laboratory of Marine Geology and Mentology,First Institute of Oceanography,Ministry of Natural Resources of the People's Republic of China,Qingdao 266061,China)

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266100 [2]山东省海洋环境地质工程重点实验室,山东青岛266100 [3]山东大学(青岛)海洋研究院,山东青岛266237 [4]自然资源部第一海洋研究所,山东青岛266061

出　　处：《海洋湖沼通报》2024年第2期41-50,共10页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金(41977234、41706068);中央高校基本科研业务费专项(201962005)。

摘　　要：在世界范围内,众多滨海地下卤水资源分布于泥质潮滩区域,但针对该区域地下河口的研究目前仅处于初级阶段,且尚未建立地下河口模型。本文选择莱州湾南岸为典型研究区,在表层沉积物垂向渗透系数不同区域开展原位高密度电阻率监测、孔隙水电导率监测及海水、地下水电导率测量。明确泥质潮滩沉积物体电导率与孔液电导率间物性关系,建立海水-地下水混合区划分标准,最后结合该标准与各潮时断面电阻率监测结果,分析海水-地下水复杂交换模式、影响因素,揭示混合区时空分布规律。研究结果表明,淤泥层中集群分布的生物通道为潮汐过程中海水-地下水交换的主要途径。泥质潮滩地下河口中“盐度晕”与“地下水排泄通道”的形成机制及其内部发生的海水-地下水交换过程与砂质潮滩存在差异。潮滩沉积物渗透性降低将引起海水-地下水通过沉积物直接交换的速率降低,进而导致其交换主要途径向高渗透性通道偏移,同时通道内海水的入侵及排泄的速度将会加快。In the world,many coastal underground brine resources are distributed in the muddy tidal flat area,but the research on the subterranean estuary in this area is only in the primary stage,and the model has not been established.In this paper,the southern bank of Laizhou bay was selected as a typical study area.Electrical resistivity tomography monitoring,pore water conductivity monitoring,seawater and groundwater conductivity measurement were carried out in the areas with different vertical permeability coefficients of surface sediments.The sediment-physical relationship of muddy tidal flat was clarified.A standard for the division of seawater-groundwater mixed zones was established.This standard combined with the electrical resistivity tomography monitoring results at each tidal time to analyze the complex exchange mode of seawater-groundwater and its influencing factors,and to reveal the temporal and spatial distribution of the mixing zone.The research results showed that the biological channels clustered in the silt layer were the main ways of seawater-groundwater exchange during the tidal cycles.The formation mechanism of"upper saline plume"and"groundwater discharge tunnel"in the muddy tidal flat subterranean estuary and the seawater-groundwater exchange process were different from those of sandy tidal flats.Decreasing the permeability of tidal flat sediments would cause the direct exchange rate of seawatergroundwater through sediments to decrease,leading the main exchange path to shift to high-permeability channels.The flow rate of intrusion and excretion in the channels would increase.

关 键 词：泥质潮滩 地下河口 海水-地下水交换 生物通道 高密度电阻率层析成像法 

分 类 号：P345[天文地球—水文科学]