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Engineering » Electrical and Electronic Engineering » "Electrical Resistivity and Conductivity", book edited by Adel El Shahat, ISBN 978-953-51-3186-1, Print ISBN 978-953-51-3185-4, Published: May 31, 2017 under CC BY 3.0 license. © The Author(s).

Chapter 5

Estimation of Hydrological Parameters from Geoelectrical Measurements

By Héctor José Peinado Guevara, Jaime Herrera Barrientos, Omar Delgado Rodríguez, Víctor Manuel Peinado Guevara, Omar Llanes Cárdenas and María Ladrón De Guevara Torres
DOI: 10.5772/67990

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Localization of the study area.
Figure 1. Localization of the study area.
Topographic relief of the study area.
Figure 2. Topographic relief of the study area.
Section perpendicular to the Sinaloa River.
Figure 3. Section perpendicular to the Sinaloa River.
VES experimental data with their respective interpreted model compared with lithological column.
Figure 4. VES experimental data with their respective interpreted model compared with lithological column.
Bulk resistivity versus aquifer resistivity.
Figure 5. Bulk resistivity versus aquifer resistivity.
Relation between hydraulic transmissivity and transverse resistance.
Figure 6. Relation between hydraulic transmissivity and transverse resistance.

Estimation of Hydrological Parameters from Geoelectrical Measurements

Héctor José Peinado Guevara1, Jaime Herrera Barrientos2, Omar Delgado Rodríguez3, Víctor Manuel Peinado Guevara1, Omar Llanes Cárdenas4 and María Ladrón De Guevara Torres5
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In the coastal aquifer of the lowlands on the right side of the river Sinaloa there is need for fresh water for agricultural development since, around 15% of the water used in agricultural irrigation, is from underground sources. This situation is exacerbated in periods of drought, which promotes drilling with the risk of finding brackish water in them; besides, there is the risk of not meeting water demand due to low hydraulic transmissivity (T) of the aquifer, putting at risk the drilling costs that this implies. In this sense, the determination of T and K (hydraulic conductivity) is important for the development and management of groundwater exploitation of the study area. Generally by means of pumping tests in wells, T is obtained, with high costs, so there are few values of T. K is generally obtained by wells and laboratory test. The aim of this chapter is to establish an empirical relationship between T and K with Dar-Zarrouk parameter in porous media, transverse resistance (T R ), in addition to a characterization of the water quality through the electrical resistivity. This parameter is estimated from surface resistivity measurements, which are more economical in relation to the pumping tests; thus, T was characterized in the study area. The coefficient of correlation of the exponential adjustment is 0.79 and the relation is T=137185.7 TR0.020758156691 and K=367.210.0548518.813 with coefficient of correlation of 0.678.

Keywords: electrical resistivity, water quality, transverse resistance, hydraulic transmissivity, hydraulic conductivity

1. Introduction

Groundwater of the coastal aquifer in the lowlands of the right side of the Sinaloa River constitutes an important support element for the development of agricultural activity in the region, especially during periods of drought. In order to extract groundwater, it is necessary to perform perforations, whose costs are high. In addition to the high cost is the uncertainty of finding fresh water, so it is desirable to have a preliminary characterization of the quality of groundwater, as well as the hydraulic property, which defines the aquifer water production. Hydraulic transmissivity (T) determines the flow of groundwater that is transmitted through a vertical strip of aquifer-wide unit under a hydraulic gradient unit. This parameter is required in numerical flow modeling processes [1, 2]; recharge tests; and in the determination of the radius of influence of a well for the determination of the perimeters of protection to the contamination of well water, among others. It is useful to estimate the resource groundwater and its integral management [3] through pumping tests, which generally are scarce due to high costs; therefore, the power to determine it through geoelectric parameters such as the resistivity of the aquifer formation, obtained through a vertical electrical sounding [4] is of interest, since this is a non-destructive, economical method and no drilling is required for its realization. The hydraulic limitations presented by the aquifers are directly related to the permeability and thickness that each sequence of the sedimentary cover can develop [5]. The physical analogy between hydraulic and electric flow has been a motivation to study for several authors [2, 3, 612] who present relations between electrical and hydraulic parameters of an aquifer. Nourbehect [13] presents a general theoretical approach on the coupling between various flows of fluids of nature through a functional relation, which allows to establish that there are relations between electrical and hydraulic parameters. In this work, we are experimenting in the search for exponential relations between Ro and Rw; T and K with the electric transverse resistance. The transverse resistance is one of the Dar-Zarrouk parameters and has been proved to be useful in the evaluation of hydraulic conductivity and transmissivity [1420]. In a flat and stratified earth model, each geoelectric layer is characterized by a thickness h and an electrical resistivity ρ. These parameters allow obtaining the parameter of Dar-Zarrouk, the electric transversal resistance (TR), which, for a layered medium of n layers, in each layer is defined as:

Niwas and Singhal [21] found analytic relationship between the parameters of Dar-Zarrouk and T as:

T = ()TR and assuming that the product remains unchanged in areas with similar geological setting and water quality T = CTR. By knowing the value of this constant C, the T and K can be calculated by knowing TR.

Ponzini et al. [8] found an empirical function between the transversal electrical resistance of an aquifer with its T. The shape of the relation between aquifer properties and geophysical parameters can be linear or non-linear [16]. The empirical function found is of the potential type of the form TR = ATM+ B, where TR is transversal resistance, T the hydraulic transmissivity, and the terms A, M, and B are constant. Soupios et al. [22] found relations between electrical cross-resistance and hydraulic transmissivity with an expression of the form proposed by Ponzini et al. [8]. Perdomo et al. [23] established a relation of the form T = A.TRM. On the other hand, Kazakis et al. [12] obtained linear relations between the K and the resistivity of the aquifer. Some authors have found a linear relationship between T and TR [1619]. The works of these authors suggest that there is a relation between the transmissivity of an aquifer and the parameter of Dar-Zarouk, also that this relation is influenced by the geo-hydrological conditions of the place and maintains an exponential relation. Under these circumstances and taking into account that T, TR, and electrical resistivity can be obtained from surface measurements of electrical resistivity in combination with pumping tests, it is possible to find relations for the study area.

2. Materials and methods

2.1. Description of the study area

The study area is located between the coordinates 25°16′50″ and 25°41′13″ north latitude and 108°24′51″ to 108°41′22″ west longitude (see Figure 1). The climate is dry, very warm, and warm with rains in summer. The average annual precipitation is 300–400 mm (1986–2013) [24]. The average annual temperature is 22–24°C for the 1986–2013 series [24]. Soils are of alluvial origin, Cenozoic era, quaternary period, predominating soils Vertisol (62.55%), Solonchak (21.72%), Cambisol (3.17%), Kastañozem (2.58%), Regosol (2.13%), Phaeozem (1.52%), Arenosol (1.24%), Fluvisol (0.92%), and Leptosol (0.56%) [25].


Figure 1.

Localization of the study area.

The topographical relief is smooth, has a gradient that goes from 0.5 to 1 m per kilometer in a northeasterly direction (Figure 2). This was obtained from the heights of the ledge of the wells.


Figure 2.

Topographic relief of the study area.

2.2. Wells information

Thirty wells were analyzed with a depth between 100 and 150 m, which were built by the National Water Commission. The wells are geotagged with a portable GPS brand Magellans. Water samples were obtained from each well; for this the wells in operation were sought, and groundwater electrical conductivity was measured in situ. Each of the wells counts with information of pumping tests at constant flow rate and steady state in recovery, lithologic columns, and well construction design. With the information of the pumping tests, T was obtained by the Theis method [26].

The interpretation of the pumping tests indicated that 3.3% of the T values are comprised in medium high, 6.7% in high, and 90% in very high according to the classification of Villanueva and Iglesias [26].

The Theis method presupposes that the well crosses the whole aquifer. In this case, the correction was not made, because at the moment, neither with geophysics nor with the columns of the wells, the total thickness of the aquifer is known. On the other hand, the impact of the lack of correction is insignificant, since the observed descents are less than 15% of the total saturated thickness, that is, the thickness is greater than 150 m and the observed descent is less than 10 m; thus, according to [26] it is not necessary to make the correction to Dupuit when the descents are inferior to 15 by 100 of the initial saturated thickness, H0.

2.3. Aquifer geometry

With the information of the 30 lithological columns of wells, the geometry of the aquifer of the study area was determined. Figure 3 shows a section with the sequence of materials where an abundance of gravel with silty clay matrix, standing out in the presence of a body of gravel is seen. The lithological columns of the wells that have depths between 100 and 150 m do not show a geological or hydrogeological basement.


Figure 3.

Section perpendicular to the Sinaloa River.

2.4. Vertical electrical soundings

Fourteen wells were selected from 30 wells. In these, a vertical electrical survey was carried out, having them as the center of the sounding. The Schlumberger array was used with a maximum current electrode separation of 500 m the soundings were interpreted by direct modeling using the Guptasarma algorithm [27].

2.5. Relation between Rw and Ro

With the modeling of the vertical electrical sounding, the resistivity (Ro) of the saturated thickness of the formation is obtained. Rw value is obtained from the field measurement of well water samples in pumping. From the different values of Ro and Rw by minimum squares adjustments, the constants A and B of the linear relation are obtained:

3. List of hydrological parameters (T and K) with geoelectric measurements and pumping tests

With information from true resistivity (Ro) of each layer and its thickness (h) TR was obtained, which was related to T and K from the exponential expressions of the form:

Where T is the hydraulic transmissivity, K is the hydraulic conductivity, TR is the transverse resistance, and A, M and B are constants obtained by minimum squares adjustment.

4. Results and discussion

4.1. Geoelectric sounding

Figure 4 shows the result of the VES performed in wells 1 and 10. For the modeling of the VES data, the available information of the lithological columns, static level of the water, and its salinity was considered. Experimental data and their corresponding models, as well as the root-mean-square (RMS) error of each adjustment are presented. The lithological relationship with electric resistivity allows delimiting the aquifer area, characterized by predominantly low clayey materials. In the case of well 1, the electrical resistivity was 13.04 Ω-m, and in the case of well 10, it varied from 9 to 29 Ω-m. The presence of materials with clay wells favors the TTR ratio [10].


Figure 4.

VES experimental data with their respective interpreted model compared with lithological column.

4.2. Water quality

Some authors [11, 2830] have successfully applied the Archie’s law to hydrogeology studies. Figure 5 shows the fit for 14 pairs of Rw− Ro values that illustrate a linear function directly proportional connecting the groundwater resistivity (Rw) and the saturated layer resistivity (Ro); as the pore water resistivity increases, the formation resistivity increases as well. The constants A and B are 1.014091 and −2.316, respectively. The correlation factor resulting from the adjustment is 0.90, therefore


Figure 5.

Bulk resistivity versus aquifer resistivity.


The practical meaning of this relation is that, if it is desired to perform a perforation in the study area, it is possible to perform a vertical electrical sounding prior to drilling; its interpretation can be determined by Ro, which when placed in the above expression enables a priori value, Rw. Electrical conductivity (EC) of water is inversely proportional to the electrical resistivity and is determined by the expression

With the value of the EC and considering the relationship between EC and total dissolved solids (TDS), salinity can be obtained by the expression [31]

With the value of TDS, the type of water expected can already be determined [32]. From the interpretation of the VESs, it was found that the resistivity of the aquifer formation Ro varies between 7.4 and 21.9 Ω-m, for its part, the water of the formation presented a resistivity that oscillated between 5.2 and 19.2 Ω-m (see Table 1). Value of Ro is 10 Ω-m and Rw is 7.825 Ω-m. This value corresponds to 774 ppm of TDS (salinity); thus, it is fresh water according to the classification of Heath [32]

Well numberWell depthPorewater resistivity (Rw, Ω-m)Hydraulic transmissivity (m2/day)Hydraulic conductivity (m/day)Computed parameters—VES interpretation
h (m)Ro resistivity (Ω-m)TR transverse resistance (Ω m2)

Table 1.

Data used and interpreted parameters.

4.3. The relationship between T and TR

From Ro and aquifer thickness (h) values, TR was determined. Table 1 shows the TR values for 14 wells and their respective T and K values. Figure 6 shows that TR and T have a relationship as those found in Refs. [8, 11, 23]. The adjustment to the graph is of exponential type with values of the coefficients A, M, and B of 137185.7, 0.020758, and −156691, respectively. The coefficient of correlation of the exponential adjustment is 0.79.


Figure 6.

Relation between hydraulic transmissivity and transverse resistance.

T=137185.7 TR0.020758156691

The values of the coefficients depend on the geological conditions, so Ebong et al. [11] found T = 0.2319TR0.7246, Perdomo et al. [23] T = 0.53 TR0.98, Ponzini et al. [8] TR = 4.022 × 103T0.577 + 17.2.

Other authors have found direct linear relationship: Niwas and Celik [10] assumed that the product remains unchanged in areas with similar geological setting and water quality; Frohlich and Kelly [33], for a constant water resistivity value of 100 Ω-m, obtained a linear relationship between TR and T; and Kosinsky and Kelly [34] in glacial outwash material.

Since is not constant, then according to [10], the expected relation between T and TR is not linear but exponential. This is due to the geological nature of the study area, which is expressed through the distribution of T and the EC of the aquifer. The values of T are high and vary from 452.4 to 4294.6 m2/day. The EC varies between 0.45 and 1.35 mS/cm.

4.4. The relationship between K and TR

Hydraulic conductivity K was obtained from the relation T = Kb, finding that this varies from 4.77 m/day to 47.83 m/day. It is an essential parameter to describe water movement under saturated conditions [35]. With the TR and K values of each well, Figure 6 was constructed, which in an analogous way to T − TR. The values of the coefficients of the exponential adjustment A, M, and B were 367.21, 0.0548, and −518.813, respectively. The coefficient of correlation of the exponential adjustment is 0.678.


Measurements of aquifer resistivity are useful to estimate the aquifer hydraulic conductivity due to the fundamental relation between K and electrical conductivity [36]. Kelly [37] worked with glacial outwash materials and obtained a linear connection between resistivity and K in relatively uniform water quality. The exponential relation allows to correlate K with TR, in an area where T and σ already indicated are not uniform.

5. Conclusions

Exponential relations between geohydrologic parameters (T, K) and geoelectric parameter (TR) have been found with a good statistical adjustment. These relations allow to characterize the water quality and the transmission capacity of the aquifer; therefore, for placements between the wells with which the empirical relations were obtained, there is a characterization so that from the realization of VES a geoelectric section of the subsoil, which includes the value of Ro, thus obtaining TR. When TR is obtained, relations with T and K can be found. With these relations, scenarios can be proposed on descents in future wells to be performed. Thus, the relations found guide the planning and use of groundwater.


Our gratitude to the General Direction of Research and Post graduate of the Autonomous University of Sinaloa for supporting the Project and generating the suitable conditions to fulfill the present work.


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