NDLI: Groundwater temperature and electrical conductivity as tools to characterize flow patterns in carbonate aquifers: The Sierra de las Nieves karst aquifer, southern Spain

Content Provider	Springer Nature Link
Author	Liñán Baena, C. Andreo, B. Mudry, J. Carrasco Cantos, F.
Copyright Year	2008
Abstract	In carbonate massifs, flow patterns are conditioned by karstification processes which develop a conduit network and preserve low permeability microfractured blocks. The Sierra de las Nieves karst massif (southern Spain) is subjected to a given climatic and geological context, and thus it is possible to analyse the spatial and temporal variability of the water temperature and electrical conductivity at its main karst outlets, which display different responses to rainfall episodes. In this experimental field area, conduit flow and diffuse flow drainage patterns have been distinguished by combining groundwater temperature and electrical conductivity data. Both parameters show large variations in water coming from conduit flow systems and low variations in water drained by springs draining diffuse flow systems. However, groundwater temperature displays the smallest variations, which seems to indicate that this parameter is less sensitive as regards characterising the degree of karstification, which is a key question in characterising the aquifer functioning.Dans les massifs carbonates, les écoulements sont conditionnés par les processus de karstification qui ont permis le développement de réseaux de conduits karstiques au sein de blocs micro fractures de faible perméabilité. Le massif karstique de la Sierra de las Nieves (Sud de l’Espagne) est soumis à un climat donné dans un contexte géologique déterminé ; il est ainsi possible d’analyser la variabilité spatiale et temporelle de la température de l’eau et de la conductivité électrique au niveau des principaux exutoires, donnant des réponses différentes aux épisodes pluvieux. Dans le cadre de ce site expérimental, des écoulements de type conduit et de type drainage diffuse ont été mise en évidence à partir d’une analyse combine de la température de l’eau et de la conductivité électrique. Les deux paramètres indiquent une grande variabilité dans les eaux provenant des systèmes de conduits et de faibles variations pour les eaux des sources drainant des systèmes de drainage diffus. Cependant, la température de l’eau souterraine montre de faibles variations, ce qui semble indiquer que ce paramètre est moins sensible à la caractérisation du degré de karstification, une question clef de la caractérisation du fonctionnement d’un aquifère.En macizos carbonatados, las condiciones de flujo están condicionadas por los procesos de karstificación, los cuales desarrollan una red de conductos kársticos y preservan bloques microfracturados de baja permeabilidad. El macizo kárstico de la Sierra de las Nieves (Sur de España) está sometido a unas condiciones climáticas y geológicas dadas, por lo que es posible analizar la variabilidad temporal de la temperatura y conductividad eléctrica del agua de sus principales manantiales kársticos, los cuales muestran diferentes respuestas a los episodios de lluvia. En esta área experimental se han distinguido condiciones de flujo difuso y de flujo por conductos combinando datos de temperatura y conductividad eléctrica del agua subterránea. Ambos parámetros muestran grandes variaciones en el agua de los sistemas de flujo por conductos y bajas variaciones en el agua de manantiales alimentados por sistemas de flujo difuso. Sin embargo, la temperatura del agua muestra las variaciones menores, lo cual parece indicar que este parámetro es menos sensible para caracterizar el grado de karstificación, una cuestión clave para caracterizar el funcionamiento de los acuíferos.在碳酸盐岩地块中, 岩溶管道网络和低渗透率微裂隙岩体共存。径流模式受到这种岩溶作用过程的制约。西班牙南部Sierra de las Nieves岩溶区具有已知的气候和地质环境, 因此可在主要的岩溶出水口分析能反映不同降水情景的水温和电导率的时空变化。在该试验场地区, 根据地下水温度和电导率数据识别出了管流和隙流的排泄方式。两种数据都表明, 来自管流系统的水量变化大, 而排泄隙流系统的泉的流量变化小。但地下水温度显示了最小的变化, 或表明该参数在刻画岩溶化程度时不够灵敏, 而岩溶化程度是描述含水层功能的关键问题。Em maciços carbonatados, os padrões de escoamento são condicionados por processos de carsificação que promovem o desenvolvimento de uma rede de condutas e preservam blocos microfracturados de baixa permeabilidade. O maciço cársico de Sierra de las Nieves (sul de Espanha) enquadra-se num contexto climático e geológico específico, sendo por isso possível analisar a variabilidade espacial e temporal da temperatura da água e da condutividade eléctrica nas suas descargas principais, que apresentam diferentes respostas para episódios chuvosos. Neste campo experimental, foram distinguidos padrões de drenagem de escoamento em condutas e de escoamento difuso, através da combinação de dados de temperatura e de condutividade eléctrica da água subterrânea. Ambos os parâmetros apresentam grandes variações na água proveniente do escoamento em condutas e reduzidas variações na água que é drenada pelas nascentes que provêm dos sistemas com escoamento difuso. Contudo, a temperatura da água subterrânea apresenta as menores variações, o que parece indicar que este parâmetro será menos sensível para a caracterização do grau de carsificação, que é a questão-chave para caracterizar o funcionamento do aquífero.
Starting Page	843
Ending Page	853
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	17
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2008-11-29
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Karst Groundwater temperature Electrical conductivity Conduit and diffuse flow systems Spain Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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