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Mapeo de la sensibilidad espacial de los parámetros hidráulicos de Aquitard en las reducciones de ensayo de bombeo

Martijn D van Leer1, Willem J Zaadnoordijk2,3, Alraune Zech4

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Los ensayos de bombeo revelan las propiedades del acuitardo, mostrando cómo la conductividad hidráulica y el almacenamiento específico influyen en los niveles de agua. El análisis de sensibilidad ayuda a determinar qué zonas acuíferas están mejor representadas por los pozos de observación.

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Área de la Ciencia:

  • Hidrogeología
  • Ciencias del medio ambiente

Sus antecedentes:

  • Comprender las propiedades del acuitardo es crucial para la gestión de los recursos hídricos subterráneos.
  • Las pruebas de bombeo son métodos comunes para la caracterización de los acuíferos.

Objetivo del estudio:

  • Investigar la sensibilidad espacial y temporal de la conductividad hidráulica del acuitardo y el almacenamiento específico en las salidas de ensayo de bombeo.
  • Determinar qué zonas del acuitardo están representadas por extracciones en diferentes pozos de observación.

Principales métodos:

  • Se utilizó un modelo MODFLOW 6 de tres capas para simular las pruebas de bombeo.
  • Se realizó un análisis de sensibilidad local utilizando PEST++ para evaluar la influencia de los parámetros.
  • Las simulaciones utilizaron una red de Voronoi circular a través de varios escenarios de transmisividad y condiciones de límite.

Principales resultados:

  • Los patrones de sensibilidad en el acuífero bombeado forman formas elípticas alrededor de los pozos.
  • La sensibilidad en los acuíferos superpuestos está influenciada por las relaciones de transmisividad, favoreciendo las áreas de pozos de bombeo o de observación.
  • La sensibilidad evoluciona con el tiempo, expandiendo la influencia y cambiando hacia pozos de observación bajo condiciones semiconfinadas.

Conclusiones:

  • Los ensayos de bombeo proporcionan información valiosa sobre la heterogeneidad de los acuíferos.
  • El análisis de sensibilidad ayuda a optimizar el diseño del ensayo de bombeo para una mejor caracterización.
  • Los hallazgos mejoran la interpretación de las propiedades de los acuitardos a partir de datos transitorios de flujo de agua subterránea.