Abstract
A well-known analytical solution of Jacob (1950) for groundwater flow due to tidal-wave propagation, together with field measurements along a complete tidal cycle and geological data, were used to evaluate the heterogeneities in the hydraulic properties of a phreatic aquifer located next to the River Ajo in the coastal plain environment of the southern sector of the Samborombon Bay wetland, Argentina. From the analysis of water-table fluctuations in a set of monitoring wells located along a riverbank-normal transect, it was possible to quantify the piecewise spatial variations of the hydraulic diffusivity of the phreatic aquifer. The results show the strong lateral variations of the sedimentary environment due to the influence of the different transport and deposition agents that characterize the coastal plain. The known thickness of the phreatic aquifer and the estimated range of the specific yield allowed the hydraulic conductivity to be identified as the most influential factor. [Jacob CE (1950) Flow of ground water. In: Rouse H (ed) Engineering Hydraulics. Wiley, New York]
Résumé
Une résolution analytique bien connue de Jacob (1950) de l’écoulement de l’eau souterraine résultant de la propagation d’une onde de marée, ainsi que des mesures de terrain, d’un bout à l’autre d’un cycle complet de marée et des données géologiques, ont été utilisées pour évaluer les hétérogénéités dans les caractéristiques hydrauliques d’un aquifère situé à proximité de la Rivière Ajo dans l’environnement de la plaine côtière du secteur méridional de la zone humide de la Baie de Samborombon, Argentine. A partir de l’analyse des fluctuations de la surface piézométrique de la nappe dans un groupe de puits d’observation situé le long d’une section perpendiculaire à la berge de la rivière, il a été possible de quantifier les variations spatiales par morceaux de la diffusivité hydraulique de l’aquifère phréatique. Les résultats montrent de fortes variations latérales de l’environnement sédimentaire qui sont dues à l’influence de différents agents de transport et de dépôt qui caractérisent la plaine côtière. L’épaisseur connue de l’aquifère phréatique et l’éventail estimé des débits spécifiques ont permis d’identifier la conductivité hydraulique comme le facteur le plus influent. [Jacob CE. (1950) Flow of ground water (écoulement d’eau souterraine). In : Rouse H (ed) Engineering Hydraulics. Wiley, New York]
Resumen
Se utilizó una conocida solución para el flujo subterráneo debido a la propagación de una onda de marea (Jacob 1950), conjuntamente con medidas de campo sobre un ciclo completo de marea y datos geológicos previos, para evaluar la heterogeneidad de las propiedades hidráulicas de un acuífero freático contiguo al río Ajó localizado en la planicie costera del sur de la Bahía Samborombón, Argentina. A partir del análisis de las oscilaciones de los niveles freáticos en un conjunto de pozos de monitoreo ubicados a lo largo de una transecta normal a la orilla del río, fue posible cuantificar por secciones las variaciones espaciales de la difusividad hidráulica del acuífero freático. Los resultados muestran las fuertes variaciones laterales del ambiente sedimentario debidas a la influencia de los diferentes agentes de transporte y depositación que caracterizan a la planicie costera. Se pudo identificar, en base al espesor conocido del acuífero freático y del intervalo de variación estimado del coeficiente de almacenamiento, que el factor más influyente es la conductividad hidráulica. [Jacob CE. (1950) Flow of ground water (écoulement d’eau souterraine). In : Rouse H (ed) Engineering Hydraulics. Wiley, New York]
摘要
利用著名的解潮汐传播驱动的地下水流的Jacob解析解(1950) 以及完整潮汐周期内的现场测量和地质数据, 评估了阿根廷桑博龙邦湾湿地南部滨海平原阿霍河附近潜水含水层水力性质的不均一性。根据位于沿垂直于河岸断面的一系列监测井的潜水位波动情况分析, 可分段量化潜水含水层水力扩散率的空间变化。结果显示, 由于滨海平原中搬运和沉积动力的差异, 其沉积环境在侧向上呈强烈波动。根据已知的潜水含水层厚度和给水度范围, 可确定渗透系数为最大影响因素。 Jacob CE. (1950) Flow of ground water (地下水流动). 见: Rouse H (ed.) Engineering Hydraulics (工程水力学). Wiley, New York
Resumo
Recorreu-se a uma solução analítica bem conhecida de Jacob (1950) para fluxo de água subterrânea devido à propagação do efeito de maré, juntamente com medições de campo ao longo de um ciclo de maré completo e informação geológica, para determinar heterogeneidades nas propriedades hidráulicas de um aquífero livre localizado nas proximidades do Rio Ajo, em ambiente de planície costeira do sector sul da zona húmida da Baía de Samborombon, Argentina. A análise das flutuações do nível freático num conjunto de furos de monitorização implantados num alinhamento perpendicular às margens do rio possibilitou a quantificação das variações espaciais na difusividade hidráulica do aquífero livre. Os resultados evidenciam uma forte variação lateral do ambiente sedimentar, devido à influência de diferentes agentes de transporte e deposição que caracterizam a planície costeira. A espessura conhecida do aquífero livre e a variação estimada para a cedência específica permitiram identificar a condutividade hidráulica como o factor mais influente. [Jacob CE. (1950) Flow of ground water (écoulement d’eau souterraine). In : Rouse H (ed) Engineering Hydraulics. Wiley, New York]
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The authors are very grateful to the Argentine National Agency for Scientific and Technological Promotion (PICT 38256/05) and National Council on Scientific and Technical Research (PIP 5632/05) of Argentina for funding this research.
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Carol, E.S., Kruse, E.E., Pousa, J.L. et al. Determination of heterogeneities in the hydraulic properties of a phreatic aquifer from tidal level fluctuations: a case in Argentina. Hydrogeol J 17, 1727–1732 (2009). https://doi.org/10.1007/s10040-009-0478-3
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DOI: https://doi.org/10.1007/s10040-009-0478-3