Study on the influence of seawater density variation on sea water intrusion in confined coastal aquifers
Study on the influence of seawater density variation on sea water intrusion in confined coastal aquifers
复制标题
DOI：
10.1007/s12665-019-8684-3
复制
发表时间：
2019-11
影响因子：
2.8
通讯作者：
Jin Na;B. Chi;Yan Zhang;Jiale Li;Xue Jiang
中科院分区：
文献类型：
--
作者：
Jin Na;B. Chi;Yan Zhang;Jiale Li;Xue Jiang
海水密度和地下水位变化的耦合作用在滨海承压含水层海水入侵中起着重要作用。本文通过室内实验和数值模拟，研究了海水密度沿着变化对水力梯度的影响。实验中的盐度和密度参数是根据中国渤海的有关资料确定的。结果表明，较高的盐水密度有利于海水侵入底部含水层，并加速了水力梯度变化时的循环。即使盐水密度的微小变化也会改变承压含水层的稳定状态，在试图控制海水入侵时应考虑到这一点。此外，在这些实验中还考察了海水密度变化对瞬时盐楔动力学的影响。同时使用TOUGH 2/EOS 7软件包进行数值建模，以模拟SW的行为。模拟结果与实验结果基本一致。该研究有助于进一步认识海水入侵的机理，从而对沿海地区的海水入侵问题进行有效的管理。
The coupled influence of seawater density and groundwater level variation plays an import role in seawater intrusion in confined coastal aquifers. In this study, the effects of seawater density variations along with changing hydraulic gradients were investigated by conducting laboratory experiments and numerical simulations. Parameters of salinty and density in the experiments are based on the references related Bohai sea of China. The results indicate that the higher density of saltwater facilitates the seawater intrusion into the aquifers at the bottom and accelerates the circulation at the changing hydraulic gradient. Even slight variations in saltwater density can change the steady-state conditions in a confined aquifer, which should be considered when attempting to control the intrusion of seawater. Moreover, the influence of seawater density variations on transient salt-wedge dynamics was also examined in these experiments. Numerical modelling was simultaneously performed to mimic the behaviour of SW using the TOUGH2/EOS7 package. The simulated results were generally consistent with those obtained from the experiments. This study is conducive to further understand the mechanism of seawater intrusion, thereby leading to effective management of the problem in coastal areas.