ESTIMATION OF HYDRAULIC CONDUCTIVITY AND CONTENT OF FINES FROM EXPERIMENTAL LAWS THAT CORELATE HYDRAULIC AND ELECTRIC PARAMETERS

Hydraulic conductivity is a basic element in the advancement of knowledge of a geological environment in both the flow and transport processes of pollutants for conservation projects, managementand environmental management and also for the development of public policies for protection of ecosystems, among others. The aim of this paper is to obtain the hydraulic conductivity (K) and the finescontent (C) of saturated granular half using two empirical laws. One correlates the electrical conductivity of saturated granular media σo and water saturated σw which depends on the formation factor(F), cation exchange capacity (CEC) and the fines content in the saturated soil. Using data obtained from materials of 18 samples from 6 wells the relationships between F-C and CEC-C were obtained,so the equation reduces to a σo function in terms of σw and C, with a correlation coefficient of R = 0.97. A second experimental law is the one that results from the experimental relationship between K and C,being 1.4054 K 0.1804.C with a correlation coefficient of R = 0.96. From both experimental expressions relationships between K and C, a and C,and C are created so from every pair knowing one of them you get to know the other one. Under the scheme outlined electrical conductivity sections for the saturated medium and fines content are obtained,finding that the groundwater in the study area consists of a thin top layer and beneath it there is a predominantly sandy environment

Relationship between chloride concentration and electrical conductivity in groundwater and its estimation from vertical electrical soundings (VESs) in Guasave, Sinaloa, Mexico

Soils in arid or semi-arid areas often have salinity problems, so the quality of irrigation water plays an important role in agricultural production. Groundwater quality analysis includes the determination of chloride ions, which are toxic to plants in high concentrations. A total of 1358 groundwater samples were collected and analyzed in the period 1980-2008. Water electrical conductivity [EC] and chloride ion concentration values were related by the linear equation [Cl-] = 4.928 EC (R> 0.94), to estimate the concentration of chloride ions as a function of the electrical conductivity of water in the study area. A geophysical survey was conducted through 34 Vertical Electrical Soundings (VESs) to calculate the water electrical conductivity from the interpretation of the apparent resistivity data. Twenty-nine VESs were used to relate the resistivity of the saturated formation (Ro) with that for the groundwater (Rw) by the linear equation Rw = 0.427 Ro + 1.987. Then, EC was estimated as the inverse of Rw. Finally, the chloride ion concentration was determined by the equation mentioned above. Following the same procedure for the five remaining VESs, which were acquired in places where there are no wells, the chloride ion concentration and the electrical resistivity of the saturated formation (Ro) and groundwater (Rw and its inverse EC) were obtained without requiring a destructive technique.Los suelos de zonas de clima árido o semiárido a menudo tienen problemas de salinidad, por lo que la calidad del agua para riego juega un papel importante en la producción agrícola. Los análisis en agua subterránea incluyen la determinación del ión cloruro, el cual en grandes concentraciones es tóxico para las plantas. Se analizaron en laboratorio 1358 muestras de agua subterránea tomadas en el periodo de 1980 - 2008 con lo que se determinó la conductividad eléctrica y la concentración del ión cloruro. Estos resultados sirvieron para obtener la ecuación de correlación lineal [Cl4.928 = [- EC (R>0.94), con el propósito de estimar la concentración del ión cloruro en función de la conductividad eléctrica del agua en el área de estudio. Se realizó la prospección geofísica a través de 34 Sondeos Eléctricos Verticales (SEV), para calcular la conductividad eléctrica del agua a partir de la interpretación de los datos de resistividad aparente. Con 29 SEV se relacionó la resistividad del medio saturado con la resistividad del agua subterránea mediante la ecuación lineal: Rw = 0.427 Ro + 1.987 Posteriormente, se calculó la conductividad eléctrica del agua, como inversa de su resistividad, por último, la concentración del ión cloruro mediante la ecuación expuesta anteriormente para el área de estudio. Siguiendo el mismo procedimiento, en los cinco SEV restantes efectuados en lugares donde no hay perforaciones, se pudo estimar la resistividad eléctrica de la capa saturada (Ro), la resistividad eléctrica del agua del acuífero (Rw, y su inverso EC) y la concentración del ión cloruro, sin requerir el uso de una técnica destructiva

Estimación de la conductividad hidráulica y contenido de finos a partir de leyes experimentales que relacionan parámetros hidráulicos y eléctricos

Hydraulic conductivity is a basic element in the advancement of knowledge of a geological environment in both the flow and transport processes of pollutants for conservation projects, management and environmental management and also for the development of public policies for protection of ecosystems, among others. The aim of this paper is to obtain the hydraulic conductivity (K) and the fines content (C) of saturated granular half using two empirical laws. One correlates the electrical conductivity of saturated granular media óo and water saturated ów which depends on the formation factor (F), cation exchange capacity (CEC) and the fines content in the saturated soil. Using data obtained from materials of 18 samples from 6 wells the relationships between F-C and CEC-C were obtained, so the equation reduces to a óo function in terms of ów and C, with a correlation coefficient of R = 0.97. A second experimental law is the one that results from the experimental relationship between K and C, being 4054 1. 1 . 804 K 0. C with a correlation coefficient of R = 0.96. From both experimental expressions relationships between K and C, Fa and C, and C are created so from every pair knowing one of them you get to know the other one. Under the scheme outlined electrical conductivity sections for the saturated medium and fines content are obtained, finding that the groundwater in the study area consists of a thin top layer and beneath it there is a predominantly sandy environment.La conductividad hidraulica es un elemento basico en el avance del conocimiento de un medio geologico, tanto en los procesos de flujo y transporte de contaminantes como en proyectos de proteccion, gestion y manejo del medio ambiente, asi como en el desarrollo de politicas publicas para la proteccion de ecosistemas, entre otros. El objetivo de este trabajo es obtener la conductividad hidraulica (K) y el contenido de finos (C) de un medio saturado granular mediante el uso de dos leyes empiricas. Una relaciona la conductividad electrica de un medio granular saturado �Ðo y el agua saturante �Ðw la cual depende del factor de formacion (F), la capacidad de intercambio cationico (CIC) y del contenido de finos en el subsuelo saturado. A traves de datos obtenidos de 18 muestras de materiales de 6 pozos se obtuvo la relacion entre F- C y CIC-C y Qv . C, de forma que la ecuacion se reduce a una funcion de �Ðo en terminos de �Ðw y C, con un valor de ajuste R=0.97. Una segunda ley experimental usada es la que resulta de la relacion experimental entre K y C, obteniendose 4054.1.1804.0CK con un R=0.96. De ambas expresiones experimentales se construyen relaciones econociendo una se obtiene la otra. Bajo el esquema indicado se obtienen secciones de conductividad electrica del medio saturado y contenido de finos, obteniendose que el subsuelo en el area de estudio esta constituido por una capa superior de materiales finos e infrayaciendo a este esta un medio en el que predominan las arenas