3.9 Article

Hydrochemical Indicator Analysis of Seawater Intrusion into Coastal Aquifers of Semiarid Areas

期刊

RESOURCES-BASEL
卷 12, 期 4, 页码 -

出版社

MDPI
DOI: 10.3390/resources12040047

关键词

hydrogeochemical characterization; seawater intrusion processes; geothermal water; mixing processes; cation exchange; Los Cabos block

向作者/读者索取更多资源

Saltwater intrusion into groundwater systems is a global problem caused by activities such as groundwater overexploitation and climate change. The coastal Los Planes aquifer in Baja California Peninsula, Mexico, has been affected by seawater intrusion due to excessive groundwater exploitation for over 40 years. A dataset of 55 samples, including 18 samples from campaigns between 2014 and 2016, was compiled. Various methods were used to assess the impact of seawater in the coastal aquifer, with reasonable results obtained for most of the area. However, in the northwestern part of the aquifer, samples from hydrothermal wells were not recognized using these methods, indicating the influence of thermal water and direct mixing with seawater.
Saltwater intrusion into groundwater systems is a problem worldwide and is induced mainly by human activities, such as groundwater overexploitation and climate change. The coastal Los Planes aquifer in the southern part of the Baja California Peninsula (Mexico) is affected by seawater intrusion due to more than 40 years of groundwater overexploitation. A dataset of 55 samples was compiled, including 18 samples from our campaigns between 2014 and 2016. Several methods exist to define the impact of seawater in a coastal aquifer, such as the seawater fraction, the Chloro-Alkaline Indices, the Hydrochemical Facies Evolution Diagram, and the Saltwater Mixing Index. These methods provide reasonable results for most of the coastal zone of the Los Planes aquifer. A slight increase in mineralization was observed from 2014 to 2016 compared with the situation in 2003. However, in its northwestern part, samples from hydrothermal wells were not recognized by these methods. Here, the aquifer is affected mainly by thermal water with elevated mineralization, introduced through the El Sargento fault, a main fault, which cuts through the study area in the north-south direction. By considering known hydrothermal manifestations in the interpretation, samples could be classified as a combination of four end-members: fresh groundwater, seawater, and the composition of two types of thermal water. One thermal endmember with very low mineralization coincides with the thermal water described from the Los Cabos Block, where meteoric water represents the source (found in the Sierra la Laguna). The second endmember is comparable to coastal thermal manifestations where seawater represents the main source. Therefore, the higher mineralization in the northwestern zone is the result of the mobilization of thermal groundwater and direct mixing with seawater, which is introduced locally at the coast due to overextraction. This finding is important for future management strategies of the aquifer.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

3.9
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据