NDLI: Mixing of groundwaters with uncertain end-members: case study in the Tepalcingo-Axochiapan aquifer, Mexico

Content Provider	Springer Nature Link
Author	Morales Casique, Eric
Copyright Year	2012
Abstract	Groundwater geochemical data from the northern portion of the Tepalcingo-Axochiapan Valley, in the state of Morelos, Mexico, are analyzed to improve the conceptual hydrogeologic model of the region. The geochemical data suggest that the chemical composition of groundwater is the result of a mixing process between two end-members represented by groundwater from an upper aquifer composed of volcanic-sedimentary rocks and groundwater from a lower aquifer composed of carbonate rocks. Analysis of published data demonstrates that the chemical composition of at least one of the end-members varies significantly in time. Mixing ratios are computed, taking into account the uncertainty in identifying end-members and the time variability in their chemical composition, using published methods. Computed mixing ratios suggest there is a significant contribution from the lower aquifer to the water pumped by the wells in the area, which should be taken into account in the conceptual hydrogeologic model of the region.Des données géochimiques concernant le secteur nord de la vallée de Tepalcingo-Axochiapan, dans l’état de Morelos, au Mexique, sont analysées afin d’améliorer le modèle conceptuel régional. Les données géochimiques suggèrent que la composition chimique de l’eau est le résultat d’un processus de mélange entre deux pôles représentés par l’eau d’un aquifère supérieur composé de roches volcano-sédimentaires et l’eau d’un aquifère inférieur composé de roches carbonatées. L’analyse des données publiées démontre que la composition chimique de l’un des deux pôles au-moins varie considérablement dans le temps. Des ratios de mélange sont calculés, prenant en compte l’incertitude dans l’identification des pôles et la variabilité dans le temps de leur composition chimique, à l’aide de méthodes publiées. Les ratios de mélange calculés suggèrent qu’il existe une contribution significative de l’aquifère inférieur dans l’eau pompée par les puits de ce secteur, ce qui devrait être pris en compte dans le modèle hydrogéologique conceptuel de la région.Información geoquímica correspondiente a la porción norte del valle de Tepalcingo-Axochiapan, en el estado de Morelos, México es analizada para mejorar el modelo hidrogeológico conceptual de la región. Los datos geoquímicos sugieren que la composición química del agua subterránea es resultado de la mezcla de dos miembros extremos representados por agua de un acuífero superior compuesto por materiales volcano-sedimentarios y por agua de un acuífero inferior compuesto por rocas carbonatadas. El análisis de datos publicados demuestra que la composición química de al menos uno de los miembros extremos exhibe una variabilidad temporal significativa. Proporciones de mezcla son calculadas usando una metodología publicada en la literatura que toma en cuenta la incertidumbre en la identificación de los miembros extremos y la variabilidad temporal de su composición química. Las proporciones de mezcla calculadas sugieren que el caudal extraído por los pozos en el área recibe una aportación significativa del acuífero inferior, caudal que debe ser tomado en cuenta en el modelo conceptual hidrogeológico de la región..摘要:为了加深对墨西哥莫雷洛斯州Tepalcingo-Axochiapan峡谷北部地区水文地质概念模型的了解, 本文分析了该地区的地下水地球化学数据。数据表明地下水的化学组分由两个端元的混合形成, 这两个端元分别是上部火山沉积岩含水层中的地下水和下部灰岩含水层中的地下水。对已发表数据的分析表明至少其中一个端元的化学组成随地下水在含水层中的滞留时间差异较大。考虑到端元的不确定性和不同滞留时间导致的化学组成上的差异, 用已发表方法计算不同端元的混合比。结果表明抽水导致井中下部含水层的贡献大, 区域水文地质概念模型应该考虑这一点。Dados geoquímicos das águas subterrâneas da parte norte do vale de Tepalcingo-Axochiapan, no estado de Morelos, México, foram analisados para melhorar o conhecimento do modelo hidrogeológico da região. Os dados geoquímicos sugerem que a composição química da água subterrânea é o resultado de um processo de mistura entre duas origens de água diferentes, representadas aqui pela água subterrânea do aquífero superior, formado por rochas vulcano-sedimentares, e pela água subterrânea do aquífero inferior, formado por rochas carbonatadas. A análise de dados já publicados demonstra que a composição química de pelo menos uma das origens varia significativamente no tempo. As proporções em que ocorre esta mistura foram calculadas utilizando métodos já publicados na bibliografia e tendo em conta, quer a incerteza em identificar as duas origens, quer a variabilidade temporal da sua composição química. As proporções de mistura calculadas sugerem que existe uma contribuição significativa do aquífero inferior para a água bombeada pelos poços da região, facto que deve ser tido em conta no modelo hidrogeológico da região.
Starting Page	605
Ending Page	613
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	20
Issue Number	3
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2012-01-31
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbonate rocks Unconsolidated sediments Groundwater recharge/water budget Hydrochemistry Mexico Hydrogeology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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