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截渗墙的修建是防治滨海含水层中海水入侵的有效手段，然而它对地下水渗流和排泄的影响是被忽略的。本文通过建立场地尺度的数值模型，模拟了海水入侵的动力学过程，以地下水流速和流量为指标定量评价了截渗墙结构对地下水渗流和排泄的影响。研究结果表明，截渗墙条件下的地下水排泄量呈现先上升后下降的趋势，并在墙体下方形成高流速区域，但地下水平均流速有所降低；随着墙体深度增加，与海洋边界距离减小，地下水排泄量和平均流速减小，特别是当墙体深较大时，地下水排泄量和平均流速对深度变化更加敏感。
Abstract：The construction of cutoff wall is an effective method to prevent seawater intrusion in coastal aquifers, but its effect on groundwater seepage and discharge has been ignored. In this paper, the dynamic process of seawater intrusion was simulated by setting up a numerical model with the field scale. The influence of cutoff wall structure on groundwater seepage and discharge was quantitatively evaluated with groundwater velocity and flux as indexes. The results showed that the groundwater discharge under the cutoff wall condition increased firstly and then descended, and a high velocity area was formed under the wall, but the average velocity of groundwater decreased. As the wall depth increased and the distance from the ocean boundary declined, the groundwater discharge and average velocity descended. Especially when the wall depth was large, the groundwater discharge and average velocity were more sensitive to the change of depth. The research results can provide a scientific theoretical basis for the protection and rational development of underground fresh water resources in coastal aquifers.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20210045
中图分类号:P641.2
引用信息:
[1]高明鹏,郑西来,郑天元,等.截渗墙作用下滨海地下水渗流与排泄特征[J],2022,52(04):111-119.DOI:10.16441/j.cnki.hdxb.20210045.
基金信息:
国家自然科学基金委-山东联合基金重点项目(U1806210);; 国家自然科学基金项目(42002250)资助~~
2021-01-29
2021
2021-02-22
2021-03-12
2021
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