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Hydraulic conditions at the source zone and their impact on plume behavior

Content Provider	Springer Nature Link
Author	Gueting, Nils Englert, Andreas
Copyright Year	2013
Abstract	A laboratory sandbox model (105 × 60 × 15 cm) was filled with different types of sediments to arrange different hydraulic conditions at the tracer’s injection zone. Tracer-input functions were monitored at the injection location and tracer breakthrough curves (BTCs) were measured at a downgradient detection plane. Numerical transport simulations analogous to the sandbox experiments were conducted in a numerical model parameterized with the properties of the sediments used in the sandbox. The results of the study demonstrate that the hydraulic conditions at the source zone have a major influence on plume development. Tracer injection into high-permeability zones causes early arrival, and enhanced transverse and reduced longitudinal spreading. Tracer injection into low-permeability zones causes late arrival, and reduced transverse and enhanced longitudinal spreading. It was further found that using simplified tracer-input functions in the analysis of BTCs can lead to biased transport parameters. The results suggest that transport parameter estimation based on tracer experiments can benefit from monitoring of the tracer-input function and subsequent consideration of the measured tracer-input function in the analysis of BTCs.Un modèle de boîte à sable de laboratoire (105 × 60 × 15 cm) a été rempli de différents types de sédiments pour simuler différentes conditions hydrauliques dans la zone d’injection du traceur. Les fonctions d’entrée du traceur ont été surveillées sur le site d’injection et les courbes de restitution du traceur (BTCs) ont été mesurées sur un plan de détection en aval. Des modélisations numériques de transport comparables aux expériences de laboratoire ont été conduites avec un modèle numérique paramétré selon les propriétés des sédiments utilisés dans la boite à sable. Les résultats de l’étude montrent que les conditions hydrauliques à la zone source ont une influence majeure sur le développement du panache. L’injection du traceur dans les zones de forte perméabilité cause une arrivée précoce, augmente la propagation transversale et diminue la propagation longitudinale. L’injection du traceur dans les zones de faible perméabilité entraine un retard du traceur, réduit la propagation transversale et augmente la propagation longitudinale. Il a de plus été trouvé que l’utilisation de fonctions d’injection simplifiées dans l’analyse des BTCs peut influencer les paramètres de transport. Les résultats suggèrent que l’estimation d’un paramètre de transport basée sur des expériences de traçage peut bénéficier du monitorage et d’une considération ultérieure de la fonction d’injection du traceur dans l’analyse des BTCs.Se rellenó un modelo de caja de arena de laboratorio (105 × 60 × 15 cm) con diferentes tipos de sedimentos para fijar distintas condiciones hidráulicas en la zona de la inyección del trazador. Se monitorearon las funciones de entrada del trazador en el sitio de la inyección y se midieron las curvas de ruptura del trazador (BTCs) en un plano de detección gradiente abajo. Se realizaron simulaciones numéricas de transporte análogas a los experimentos en un modelo numérico parametrizado con las propiedades de los sedimentos usados en la caja de arena. Los resultados del estudio demuestran que las condiciones hidráulicas en la zona fuente tienen una influencia mayor sobre el desarrollo de la pluma. La inyección del trazador en zonas de alta permeabilidad causa un arribo temprano, y una menor difusión longitudinal y una mayor transversal. La inyección del trazador en zonas de bajas permeabilidad causa un arribo retrasado y una difusión longitudinal mayor y una transversal menor. Se encontró además que el uso de funciones de entrada simplificadas del trazador en los análisis de BTCs puede conducir a parámetros de transporte sesgados. Los resultados sugieren que la estimación del parámetro de transporte basados en experimentos de trazadores puede favorecer el monitoreo de la función de entrada del trazador y la subsecuente consideración de la la medida de la función de entrada del trazador en el análisis de BTCs.Um modelo laboratorial (105 × 60 × 15 cm) foi preenchido com diferentes tipos de sedimentos para permitir experimentar diferentes condições hidráulicas na zona da injeção de um traçador. As entradas do traçador foram monitorizadas no local da injeção, tendo sido calculadas curvas de concentração vs tempo (CvT) segundo a direção da propagação. Foram realizadas simulações numéricas de transporte de um poluente em condições semelhantes às experimentadas no modelo laboratorial, isto é, emulando as propriedades dos sedimentos usados nesse modelo. Os resultados do estudo demonstram que as condições hidráulicas na zona da fonte de injeção têm uma grande influência no desenvolvimento da pluma. A injeção de traçador em zonas de permeabilidade alta provoca a chegada antecipada, aumentando a dispersão longitudinal e transversal. A injeção de traçador em zonas de permeabilidade baixa provoca a chegada tardia, reduzindo a dispersão longitudinal e transversal. Verificou-se ainda que a utilização de funções simplificadas de entrada do traçador na análise das curvas CvT pode levar a resultados enviesados dos parâmetros de transporte. Os resultados sugerem que a estimativa dos parâmetros de transporte com base em experiências com traçadores pode beneficiar da monitorização da função de entrada do traçador e posterior consideração da função de entrada na análise das CvT.
Starting Page	829
Ending Page	844
Page Count	16
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	21
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2013-03-15
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heterogeneity Laboratory experiments/measurements Numerical modeling Solute transport Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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