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首页> 外文会议>XIVth International Conference on Computational Methods in Water Resources (CMWR XIV), Jun 23-28, 2002, Delft, The Netherlands >The influence of a confining layer on saltwater intrusion under surface recharge and groundwater extraction conditions
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The influence of a confining layer on saltwater intrusion under surface recharge and groundwater extraction conditions

机译：在地表补给和地下水抽取条件下，限制层对盐水入侵的影响

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摘要

In many coastal areas intensive irrigation and groundwater withdrawal can exert counterbalancing effects on the dynamics of seawater intrusion in the aquifer, particularly when non-aquifer irrigation water (artificial recharge) is also used. When, as is often encountered, a shallow phreatic aquifer is separated from a deeper aquifer by a possibly discontinuous and less permeable confining layer, the effect of this semi-permeable layer on the dynamic balance between freshwater and saltwater can be very important. It can act as a barrier to seawater encroachment but also hinder attempts to replenish an over-pumped confined aquifer or to flush salts out of the phreatic aquifer. The presence of localized areas of severe upconing or salt buildup will depend not only on the distribution of pumping wells but also on the heterogeneity of the confining layer. In this study we want to quantify the impact of the confining layer by running simulations based on different realizations of its hydraulic conductivity distribution. One of the questions we seek to address is how important it is to accurately characterize (and therefore how extensively one needs to measure) the properties of such a confining layer. The study site we will use is a 273km~2 region that forms part of the plain of Oristano on the western coast of central Sardinia (Italy) characterized by Quaternary alluvial deposits, the presence of several lagoons, and about 25000 active and inactive pumping wells. The simulations will be performed with the CODESA-3D model, a three-dimensional finite element model of coupled density-dependent and variably saturated flow and transport.
机译：在许多沿海地区，特别是在还使用非含水层灌溉水（人工补给水）的情况下，密集的灌溉和抽取地下水可对含水层中的海水入侵动力学产生平衡作用。当经常遇到的是，浅水潜水层与较深的含水层被可能不连续且渗透性较差的限制层隔开时，该半渗透层对淡水和盐水之间动态平衡的影响可能非常重要。它可以作为海水入侵的屏障，但也可以阻止试图补充过度抽水的密闭含水层或将盐类从潜水含水层中冲出的尝试。严重的上冲或盐堆积的局部区域的存在不仅取决于抽水井的分布，还取决于围护层的非均质性。在本研究中，我们希望通过基于其水力传导率分布的不同实现方式进行模拟来量化限制层的影响。我们试图解决的问题之一是，准确地表征（并因此需要广泛地测量）这种限制层的特性有多重要。我们将使用的研究地点是一个273km〜2区域，该区域是撒丁岛（意大利）中部西海岸奥里斯塔诺平原的一部分，其特征是第四纪冲积层，几个泻湖的存在以及大约25000处活跃和不活跃的抽水井。将使用CODESA-3D模型执行该模拟，CODESA-3D模型是耦合了密度相关的变量和可变饱和流动和传输的三维有限元模型。

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