NDLI: Estimating hydraulic conductivity from specific capacity for Hawaii aquifers, USA

Content Provider	Springer Nature Link
Author	Rotzoll, Kolja El Kadi, Aly I.
Copyright Year	2008
Abstract	Site-specific relationships between specific capacity and hydraulic parameters (transmissivity and hydraulic conductivity) were investigated for volcanic rocks in Maui, Hawaii, USA. Details about well construction were commonly ignored in previous studies. To improve on such efforts, specific-capacity values were normalized by the open interval of the well. Correcting specific capacity for turbulent head losses using step-drawdown tests and including aquifer penetration length improved the correlation between specific capacity and hydraulic conductivity and reduced uncertainty in the prediction of hydraulic parameters. The relationships provide estimates of aquifer parameters with correlation coefficients between 0.81 and 0.99. The relationships for Maui can probably be extended to other Hawaii islands, given the similarity of aquifer formations and a reasonable fit to step-drawdown data from Oahu. Hydraulic conductivity was estimated from 1,257 specific-capacity values in the Hawaii’s well database. Hydraulic-conductivity estimates for dike-free volcanic rocks are consistent on different islands. For all islands, the estimates range from 3 to 8,200 m/d, with a geometric-mean and median value of 272 and 291 m/d, respectively. A geostatistical approach was applied to Maui and Oahu to generate island-wide hydraulic-conductivity maps to facilitate groundwater management efforts.Les relations caractéristiques entre la capacité spécifique et les paramètres hydrauliques (transmissivité et conductivité hydraulique) ont été étudiées pour les roches volcaniques de Maui, à Hawaii, USA. Les détails concernant la construction de l’ouvrage n’ont généralement pas été pris en compte dans les études précédentes. Pour améliorer l’étude, les valeurs de capacité spécifiques ont été normalisées par l’intervalle crépiné du puits. Le fait de corriger la capacité spécifique pour la perte de charge en régime turbulent en utilisant des tests de pompage par paliers et le fait de prendre en compte la longueur de la pénétration du puits dans l’aquifère, ont amélioré la corrélation entre la capacité spécifique et la conductivité hydraulique et réduit l’incertitude dans la prévision des paramètres hydrauliques. Les relations fournissent des estimations des paramètres de l’aquifère avec des coefficients de corrélation entre 0.81 et 0.99. La similitude des formations aquifères et une concordance raisonnable avec des données d’essais de pompage par paliers de l’île de Oahu laisse à penser que les relations pour Maui peuvent probablement être étendues à d’autres îles de Hawaii. La conductivité hydraulique a été estimée à partir de 1,257 valeurs de capacité spécifique issues de la base de données de puits de Hawaii. Les estimations de la conductivité hydraulique pour des roches volcaniques dépourvues de dyke sont consistantes pour différentes îles. Pour toutes les îles, les estimations varient entre 3 et 8,200 m/d, avec une moyenne géométrique et une médiane de respectivement 272 et 291 m/d. Une approche géostatistique a été appliquée pour Maui et Oahu afin de construire, à l’échelle de ces îles, des cartes de conductivité hydraulique qui faciliteront la politique de gestion des eaux souterraines.En las rocas volcánicas de Maui, Hawai, USA, se han investigado las relaciones entre la capacidad específica y los parámetros hidráulicos (transmisividad y conductividad hidráulica) en un lugar concreto. En estudios previos normalmente se ignoraron los detalles de la construcción de los pozos. Para mejorar estos esfuerzos, los valores de capacidad específica se normalizaron en el intervalo abierto del pozo. La capacidad específica corregida para las pérdidas de carga por turbulencia usando ensayos de descensos escalonados e incluyendo la longitud de penetración en el acuífero mejoró la correlación entre la capacidad específica y la conductividad hidráulica y redujo la incertidumbre en la predicción de los parámetros hidráulicos. Las relaciones producen estimaciones de los parámetros del acuífero con coeficientes de correlación comprendidos entre 0.81 y 0.99. Las relaciones para la isla de Maui probablemente pueden ser extendidas a otras islas de Hawai, dadas la similaridades de las formaciones acuíferas y el razonable encaje con los datos de descensos escalonados para Oahu. La conductividad hidráulica se ha estimado en valores de capacidad específica de 1,257 en la base de datos de pozos de Hawai. La conductividad hidráulica estimada para rocas volcánicas libres de diques es consistente en diferentes islas. Para todas las islas, la estimación oscila entre 3 y 8,200 m/d, con una media geométrica y mediana de 272 y 291 m/d respectivamente. Se aplicó una aproximación estadística a Maui y Oahu para generar mapas de conductividad hidráulica a escala de toda la isla que faciliten los esfuerzos en la gestión de las aguas subterráneas.
Starting Page	969
Ending Page	979
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-18
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydraulic properties Geostatistics Empirical relationship Volcanic island aquifer Hawaii, USA 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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