NDLI: Determination of the parameter pattern and values for a one-dimensional multi-zone unconfined aquifer

Content Provider	Springer Nature Link
Author	Chang, Ya Chi Yeh, Hund Der Huang, Yen Chen
Copyright Year	2007
Abstract	In an aquifer, heterogeneity plays an important role in governing groundwater flow. Hence, aquifer characterization should involve both the pattern and values of the hydrogeological parameters. A new analytical solution describing the one-dimensional groundwater flow in a multi-zone unconfined aquifer is presented, and a methodology developed from the analytical solution and a heuristic approach for determining the pattern and values of the aquifer parameters are proposed. The analytical solution demonstrates that the hydraulic head varies spatially and is influenced by aquifer heterogeneity. Simulated annealing, a heuristic approach, is incorporated with the solution to simultaneously identify the pattern and values of the hydraulic conductivity for a horizontal multi-zone unconfined aquifer. This approach may be used to give an approximate result for a two-dimensional problem by dividing the model area into a number of transects along the transverse direction, identifying the parameter values along the longitudinal direction for each transect, and then smoothing the identified results.Dans un aquifère, l’hétérogénéité joue un rôle important en gouvernant l’écoulement des eaux souterraines. En conséquence, la caractérisation de l’aquifère devrait inclure et l’espace et les valeurs des paramètres hydrogéologiques. Une nouvelle solution analytique décrivant l’écoulement des eaux souterraines uni-dimensionnel dans un aquifère non-confiné à plusieurs couches est présenté, et la méthodologie développée à partir de la solution analytique et une approche heuristique pour déterminer l’espace et les valeurs des paramètres de l’aquifère sont proposées. La solution analytique démontre que la charge hydraulique varie spatialement et est influencée par l’hétérogénéité de l’aquifère. Le « recuit simulé », une approche heuristique d’optimisation, est incorporé avec la solution pour identifier simultanément l’espace et les valeurs de conductivités hydrauliques pour un aquifère libre horizontal et multi-zones. Cette approche peut être utilisée pour donner un résultat approximatif pour un problème bidimensionnel en divisant l’aire du modèle en une suite de plusieurs sections, identifiant les valeurs de paramètre le long de la direction longitudinale pour chaque section, et ensuite en arrondissant les résultats.En un acuífero, la heterogeneidad juega un papel importante en el flujo del agua subterránea. Así, la caracterización de un acuífero debe tener en cuenta tanto la disposición como los valores de los parámetros hidráulicos. Se presenta un nueva solución analítica que describe el flujo del agua subterránea en una dimensión en un acuífero libre multi-zona, y se propone una metodología desarrollada a partir de la solución analítica y la aproximación heurística para determinar la disposición y los valores de los parámetros del acuífero. La solución analítica demuestra que el nivel piezométrico varía espacialmente y está influenciado por la heterogeneidad del acuífero. Un templado simulado, una aproximación heurística, se ha incorporado a la solución para identificar simultáneamente la disposición y los valores de la conductividad hidráulica para un acuífero libre horizontal multi-zona. Esta aproximación puede ser utilizada para proporcionar un resultado aproximado en un problema bidimensional dividiendo el área del modelo en un número de transectos a lo largo de la dirección transversa, identificando los valores del parámetro a lo largo de la dirección longitudinal para cada transecto, y entonces suavizando los resultados identificados.
Starting Page	205
Ending Page	214
Page Count	10
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-10-19
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater flow Hydrogeological parameter Analytical solutions Multi-zone unconfined aquifer Simulated annealing 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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