NDLI: Estimating hydraulic conductivity using grain-size analyses, aquifer tests, and numerical modeling in a riverside alluvial system in South Korea

Content Provider	Springer Nature Link
Author	Cheong, Jae Yeol Hamm, Se Yeong Kim, Hyoung Soo Ko, Eun Joung Yang, Kyounghee Lee, Jeong Hwan
Copyright Year	2008
Abstract	Hydraulic conductivity (K) for an alluvial system in a riverbank filtration area in Changwon City, South Korea, has been studied using grain-size distribution, pumping and slug tests, and numerical modeling. The alluvial system is composed of layers: upper fine sand, medium sand, lower fine sand, and a highly conductive sand/gravel layer at the base. The geometric mean of K for the sand/gravel layer (9.89 × 10$^{−4}$ m s$^{−1}$), as determined by grain-size analyses, was 3.33 times greater than the geometric mean obtained from pumping tests (2.97 × 10$^{−4}$ m s$^{−1}$). The geometric mean of K estimates obtained from slug tests (3.08 × 10$^{−6}$ m s$^{−1}$) was one to two orders of magnitude lower than that from pumping tests and grain-size analyses. K estimates derived from a numerical model were compared to those derived from the grain-size methods, slug tests and pumping tests in order to determine the degree of deviation from the numerical model. It is considered that the K estimates determined by the slug tests resemble the uppermost part of the alluvial deposit, whereas the K estimates obtained by grain-size analyses and pumping tests are similar to those from the numerical model for the sand/gravel layer of the riverside alluvial system.La conductivité hydraulique (K) d’un système alluvial dans une zone de filtration de berge dans Changwon City, Corée du Sud, a été étudiée en utilisant la distribution de la granulométrie, les pompages d’essai et les essais par injection, et la modélisation numérique. Le système alluvial est formé de couches: supérieure de sable fin, intermédiaire de sable, inférieure de sable fin, et une couche très conductrice de sable/gravier à la base. La moyenne géométrique de K pour la couche de sable/gravier (9.89 × 10$^{−1}$ m s$^{−1}$), telle qu’elle est déterminée par les analyses granulométrique, était 3.33 fois plus élevée que la moyenne géométrique obtenue à partir de pompages d’essai (2.97 × 10$^{−4}$ m s$^{−1}$). La moyenne géométrique des évaluations de K obtenues à partir des essais par injection (3.08 × 10$^{−6}$ m s$^{−1}$) était inférieure de un à deux ordres de grandeur à celle obtenues à partir des pompages d’essai et des analyses granulométriques. Les estimations de K obtenues à partie des modélisations numériques ont été comparées à celles obtenues par les méthodes granulométriques, les essais par injection et les pompages d’essai afin de déterminer le degré d’écart avec le modèle numérique. On considère que les estimations de K déterminées à partir des essais par injection dépeignent la partie la plus superficielle du dépôt alluvionnaire, alors que les estimations de K obtenues à partir des analyses granulométriques et des pompages d’essai sont semblables à celles provenant du modèle numérique pour la couche de sable/ gravier du système alluvial de berge.La conductividad hidráulica (K) de un sistema aluvial en un área ribereña de infiltración en la Ciudad de Changwon, Corea del Sur, ha sido estudiada a partir de distribuciones granulométricas, ensayos de bombeo y de pulso y modelación numérica. El sistema aluvial se compone de capas: una superior de arena fina, una intermedia arenosa, una inferior de arena fina, y una capa basal altamente conductiva de arena y grava. La media geométrica de K para la capa de arena y grava (9.89 × 10$^{−4}$ m s$^{−1}$), determinada por análisis granulométrico, resultó 3.33 veces mayor que la media geométrica obtenida en ensayos de bombeo (2.97 × 10$^{−4}$ m s$^{−1}$). La media geométrica de las estimaciones de K a partir de ensayos de pulso (3.08 × 10$^{−6}$ m s$^{−1}$) fue entre uno y dos órdenes de magnitud menor que aquellas provenientes de ensayos de bombeo y análisis granulométricos. Los valores de K provenientes de un modelo numérico se compararon con aquellos derivados de análisis granulométricos, ensayos de pulso y ensayos de bombeo a fin de determinar el desvío con respecto al modelo numérico. Se considera que las estimaciones de K de los ensayos de pulso representan los sectores más someros de los depósitos aluviales, en tanto que los valores de K obtenidos por los análisis granulométricos y los ensayos de bombeo son similares a aquellos derivados del modelo numérico para la capa de arena y grava del sistema ribereño aluvial.
Starting Page	1129
Ending Page	1143
Page Count	15
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	6
e-ISSN	14350157
Language	Spanish
Publisher	Springer Berlin Heidelberg
Publisher Date	2008-05-08
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Grain-size analysis Hydraulic conductivity Numerical modeling Riverbank filtration South Korea Hydrogeology Hydrology/Water Resources Geology Water Quality/Water Pollution Geophysics/Geodesy 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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