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Determination of hydraulic parameters of an unconfined alluvial aquifer by the floodwave-response technique

Content Provider	Springer Nature Link
Author	Jha, Madan K. Jayalekshmi, K. Machiwal, Deepesh Kamii, Y. Chikamori, K.
Copyright Year	2004
Abstract	Groundwater constitutes a vital component of the water-resource system. Adequate knowledge of aquifer parameters is of utmost importance for proper groundwater management. In the present study, an attempt has been made to critically analyze the river–aquifer interaction and to explore the practicability and reliability of the floodwave-response technique in estimating the hydraulic parameters of the Konan aquifer, Japan. The analysis of the pertinent hydrologic and hydrogeologic data revealed a strong relationship between the Monobe River stage and the groundwater levels over a major portion of the Konan basin. Inverse modeling, using the floodwave-response model at four sites, yielded high values of hydraulic diffusivity that ranged from 16 to 194 m$^{2}$/s. However, the overall average aquifer diffusivity was found to be reasonable (0.7–3.5 m$^{2}$/s). All the selected flood events were not found suitable for determining reasonable values of hydraulic diffusivity at a given site. Using the optimal diffusivities at two sites and the aquifer transmissivity from the pumping tests at these sites, the storage coefficient values were estimated as those of truly confined aquifers. In contrast, reasonable values of storage coefficient were obtained based on the average aquifer diffusivity estimates. The sensitivity analysis of the floodwave-response model indicated that the optimal hydraulic diffusivity is very sensitive to the distance parameters of the model, which necessitate precise measurement of these parameters. It is concluded that a judicious application of the floodwave-response technique is essential, especially in the case of unconfined aquifers.L’eau souterraine constitue une composante vitale des systèmes de ressource en eau. Une connaissance adéquate des paramètres des aquifères est importante pour une gestion correcte de ces systèmes. Dans cette étude, la démarche consiste à analyser l’interaction rivière–aquifère de manière critique et d’explorer la technique permettant d’estimer les paramètres hydrauliques de l’aquifère Konan, Japon. L’analyse pertinente des données hydrologiques et hydrogéologiques révèle une relation forte entre le niveau de la rivière Monobe et les niveaux piézométriques sur une grande partie du bassin de Konan. La modélisation inverse utilisant le modèle de réponse aux vagues de crue sur quatre sites fournit des valeurs de diffusivité comprises entre 16 et 194 m$^{2}$/s. Néanmoins la valeur moyenne de diffusivité est apparue raisonnable (entre 0.7 et 3.5 m$^{2}$/s). Tous les évènements de crue n’ont pas été retenus comme permettant de calculer avec une bonne fiabilité la diffusivité sur un site donné. En utilisant les données optimales de diffusivité provenant de deux sites, et la transmissivité fournie par les essais de pompage, le coefficient d’emmagasinement a été déterminé et correspond bien à un aquifère confiné. Par contraste, des valeurs raisonnables de coefficient d’emmagasinement ont été déterminées par estimation de la diffusivité moyenne de l’aquifère. L’analyse de sensibilité du modèle de réponse aux vagues de crue indique que la diffusivité hydraulique optimale est très sensible à la distance utilisée dans le modèle, qui nécessite dés lors une mesure précise. En conclusion il est essentiel que ce type d’application doit ętre judicieusement mis en oeuvre, et spécialement dans le cadre d’aquifères captifs.El agua subterránea constituye un componente vital de los sistemas de recursos hídricos. El conocimiento adecuado de los parámetros del acuífero es de suma importancia para el manejo apropiado del agua subterránea. En el presente estudio se ha realizado un intento para analizar críticamente la interacción río-acuífero y explorar la confiabilidad y utilidad de la técnica de respuesta de onda de crecida para estimar los parámetros hidráulicos del acuífero Konan, Japón. El análisis de datos hidrológicos e hidrogeológicos pertinentes muestra una relación fuerte entre el nivel del Río Monobe y los niveles de agua subterránea en gran parte de la cuenca Konan. El modelizado de inversión utilizando el modelo de respuesta de onda de crecida en cuatro sitios generó valores altos de difusividad hidráulica que varían de 16 a 194 m$^{2}$/s. Sin embargo, se encontró que la difusividad promedio global del acuífero tenía valores razonables (0.7 a 3.5 m$^{2}$/s). Todos los eventos de crecida seleccionados no fueron encontrados satisfactorios para determinar valores razonables de difusividad hidráulica en un sitio determinado. Utilizando las difusividades óptimas en dos sitios y la transmisividad del acuífero proveniente de pruebas de bombeo en esos sitios se estimaron valores del coeficiente de almacenamiento como los que se obtendrían para acuíferos completamente confinados. En contraste, se obtuvieron valores razonables del coeficiente de almacenamiento basados en los cálculos de difusividades promedio del acuífero. Los análisis de sensitividad del modelo de respuesta de onda de crecida indicaron que la difusividad óptima hidráulica es muy sensitiva a los parámetros de distancia del modelo por lo que se necesitan mediciones precisas de esos parámetros. Se concluye que es esencial una aplicación sensata de la técnica de respuesta de onda de crecida, especialmente en el caso de acuíferos no confinados.
Starting Page	628
Ending Page	642
Page Count	15
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	12
Issue Number	6
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-09-10
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aquifer parameters Floodwave-response technique Inverse modeling River–aquifer interaction Unconfined aquifer
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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