NDLI: Upscaling of transmissivity, derived from specific capacity: a hydrogeomorphological approach applied to the Doon Valley aquifer system in India

Content Provider	Springer Nature Link
Author	Srivastav, S. K. Lubczynski, M. W. Biyani, A. K.
Copyright Year	2007
Abstract	Transmissivity (T) is one of the most important parameters in groundwater studies, and is generally estimated from pumping tests. T can also be deduced from abundantly available specific-capacity (Q/s) data by using analytical and/or empirical approaches, further upscaled by geostatistical methods. A different, remote sensing based, hydrogeomorphological approach is proposed, to upscale T from point- or well-scale to aquifer-scale, and it is applied to the piedmont alluvial aquifer system of Doon Valley in India. In the first step, Q/s and T data-pairs available from aquifer tests were used to establish an empirical, logarithmic relation. Subsequently, satellite imagery along with available data from published and unpublished maps, literature sources and ground surveys were used to divide the aquifer system into major hydrogeomorphological domains that control the groundwater occurrence and flow. Then, the T data derived from Q/s (using the empirical relation) and that available from pumping tests at well-scale were upscaled to aquifer-scale by averaging the T values within each hydrogeomorphological domain. Such a stratification approach is especially useful in areas where availability of only a few data-pairs of known Q/s and T limit the use of geostatistical techniques. A comparative study of the published empirical relations between Q/s and T in various hydrogeologic settings revealed that the relation obtained for Doon Valley aquifer system is close to that found for a similar alluvial aquifer system in Morocco.La transmissivité (T) est l’un des paramètres les plus importants dans les études hydrogéologiques, et est généralement estimée grâce aux essais de pompage. T peut également être déduite d’un nombre important de données de capacité spécifique (Q/s) disponibles, en utilisant des approches analytique et/ou empirique, redimensionnées par la suite par des méthodes géostatistiques. Une approche différente, hydrogéomorphique, basée sur la télédétection, est proposée pour redimensionner T de l’échelle ponctuelle ou échelle du puits à l’échelle de l’aquifère ; cette approche est appliquée au système aquifère alluvial de piedmont de la vallée de Doon en Inde. Dans un premier temps, des paires de données Q/s et T, issues d’essais de nappe, ont été utilisées pour établir une relation empirique, logarithmique. Par la suite, l’imagerie satellite associée à des données disponibles issues de cartes publiées et non-publiées, des informations bibliographiques et des études de terrain ont été utilisées pour diviser le système aquifère en domaines hydrogéomorphologiques majeurs contrôlant la présence et l’écoulement d’eau souterraine. Après cela, les données de T dérivées des données de Q/s (via la relation empirique) ainsi que celles issues des essais de pompage à l’échelle du puits ont été redimensionnées à l’échelle de l’aquifère en moyennant les valeurs de T pour chaque domaine hydrogéomorphique. Une telle approche de stratification est particulièrement utile dans les zones pour lesquelles un nombre restreint de paires de données disponibles connues pour Q/s et T limite l’utilisation des techniques géostatistiques. Une étude comparative des relations empiriques publiées concernant Q/s et T dans différentes conditions hydrogéologiques a révélé que la relation obtenue dans cette étude est proche de celles trouvées pour un système aquifère alluvial similaire au Maroc.La Transmisividad (T) es uno de los parámetros más importantes en los estudios de aguas subterráneas, y generalmente se estima a partir de ensayos de bombeo. T también puede deducirse a partir de datos de caudal específico (Q/s), fácilmente obtenibles mediante el uso de aproximaciones analíticas y/o teóricas, sobreescalados con métodos geoestadísticos. Se propone una aproximación hidrogeomórfica diferente, basada en la teledetección, para sobreescalar T desde una escala puntual o de pozo a la escala del acuífero, y se aplica al Sistema Acuífero aluvial de Doon Valley, en la India. En el primer paso, los pares de datos de Q/s y T que se obtienen de los ensayos de bombeo se utilizaron para establecer una relación logarítmica empírica. En un paso posterior, se utilizaron imágenes de satélite con datos disponibles de mapas publicados y no publicados, de fuentes bibliográficas y de campañas de suelo para dividir el sistema acuífero en grandes dominios hidrogeomorfológicos que controlan las características del acuífero y su flujo. Entonces, los datos de T derivados de Q/s (utilizando la relación empírica) y los datos obtenidos a partir de ensayos de bombeo a escala de pozo fueron sobreescalados a escala del acuífero mediante medias de los valores de T dentro de cada dominio hidrogeomórfológico. Tal aproximación estratificada es especialmente útil en áreas en las que sólo se disponga de pocos pares de datos de Q/s y T conocidos, que limiten la utilización de técnicas geoestadísticas. Un estudio comparativo de las relaciones empíricas entre Q/s y T publicadas en varios marcos hidrogeológicos revelan que la relación obtenida en este estudio se aproxima a la obtenida para sistemas acuíferos aluviales similares en Marruecos.
Starting Page	1251
Ending Page	1264
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	7
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-08-21
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydraulic properties Specific capacity Transmissivity Unconsolidated sediments India 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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