Joint inversion of 2D resistivity and seismic travel time data to image saltwater intrusion over karstic areas

Hamdan, Hamdan A.; Vafidis, A.

doi:10.1007/s12665-012-1875-9

Cited by 28 publications

(9 citation statements)

References 32 publications

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“…The groundwater quality was also assessed using physicochemical analysis to supplement the results obtained from geophysical method to delineate the fresh-saline aquifers. The analytical results of physicochemical parameters were obtained into statistical parameters like minimum, The cross-section AA' was constructed using 8 VES stations (i.e., VES 1,3,5,8,27,31,39 and 45) in NE-SW direction as shown in Figure 4a. Clay containing saline water and sand/gravel-sand having fresh water are the dominant lithologies along this cross-section.…”

Section: Physicochemical Analysismentioning

confidence: 99%

“…The bulk resistivity (aquifer resistivity) shows a clear contrast between the saturated fresh and saline formations which is important to delineate the fresh-saline water interface [10,16]. Resistivity decreases with increasing the salinity; hence, the resistivity methods are very useful to isolate the fresh-saline water zones [27]. Such surveys are conducted on the ground surface using a specific configuration to get the apparent-resistivity data, apparent-resistivity sounding curves and apparent-resistivity pseudo-sections which provide vertical or horizontal variations in the subsurface resistivity.…”

Section: Introductionmentioning

confidence: 99%

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Delineation of Saline-Water Intrusion Using Surface Geoelectrical Method in Jahanian Area, Pakistan

Hasan

Shang

Akhter

et al. 2018

Water

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Groundwater is the main supply of fresh water in many parts of the world. The intrusion of saline water into the fresh water is a serious threat to groundwater resources. Delineation of fresh-saline aquifer zones is essential to exploit the potable fresh water. The conventional method to differentiate fresh-saline water interface is to collect and test groundwater samples from boreholes using a number of laboratory tests. However, such techniques are expensive and time consuming. A non-invasive geoelectrical method, in combination with borehole data and physicochemical analysis, is proposed to assess the fresh-saline aquifers. This investigation was conducted in Jahanian area of Pakistan with forty-five vertical electrical soundings (VES) using Schlumberger array, nine bore wells and fifty physicochemical samples. The fresh-saline aquifers are delineated by aquifer resistivity and Dar-Zarrouk parameters namely transverse unit resistance and longitudinal unit conductance. The aquifer potential of fresh-saline water zones is estimated by the aquifer parameters namely transmissivity and hydraulic conductivity. Integration of subsurface resistivity with hydrogeological information reveals the subsurface formation of five layered succession, that is, topsoil having dry strata with resistivity greater than 30 Ωm, clay containing saline water with resistivity less than 15 Ωm, clay-sand with brackish water having resistivity between 15 and 25 Ωm, sand containing fresh water with resistivity ranging from 25 to 45 Ωm and gravel-sand having fresh water with resistivity greater than 45 Ωm. The geoelectrical columns and geological cross-sections constructed by the aquifer resistivity provide effectiveness of the interpretations for the evaluation of fresh-saline aquifers. The results of physicochemical analysis using WHO guideline validate the fresh-saline aquifer zones delineated by the geophysical method. This investigation contributes towards predicting the fresh-saline water interface using inexpensive geoelectrical method.

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Section: Physicochemical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delineation of Saline-Water Intrusion Using Surface Geoelectrical Method in Jahanian Area, Pakistan

Hasan

Shang

Akhter

et al. 2018

Water

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“…The positions of the geophysical profiles were also governed by the very difficult terrain conditions; namely, very steep slopes of the loess terraces overgrown by dense maccia. The exploration was conducted using electrical sounding, electrical tomography and seismic refraction, as these methods can help to determine the geometry of an aquifer (Šumanovac 2006), especially in complex geological conditions in karst terrains where the basic objective is to map relatively narrow fractured and fault zones and potential caves (Šumanovac & Weisser 2001;Engelsfeld et al 2008;Guerin et al 2009;Chalikakis et al 2011;Kaufmann et al 2012;Hamdan & Vafidis 2013).…”

Section: Geophysical Explorationmentioning

confidence: 99%

Defining a general hydrogeological model for Susak Island, Adriatic Sea, Croatia

Vlahović

Šumanovac

2015

QJEGH

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The island of Susak differs from other Croatian islands in its geological and hydrogeological properties, because it is, for the most part, covered with fine-grained loess-type sands. At the outset of the research it was unclear whether the main aquifer lies within the superficial deposits or within the underlying carbonate rocks. This gave rise to two alternative conceptual models, depending on whether the interface between the superficial cover and the carbonates occurs above or below sea level. Hydrogeological and geophysical investigations were conducted. The primary objective of the geophysical exploration was to determine optimum positions for exploratory boreholes. The results showed that the main aquifer is contained within the carbonate rocks, and that this carbonate aquifer is overlain by a second, confined, aquifer within the superficial sandy deposits. Groundwater within the carbonate aquifer is hydraulically connected to the sea by fault zones. Measurement of electrical conductivity in boreholes established that the mixing zone of fresh and salt water is at depths from 22 to 30 m below ground level. It is necessary to ensure constant control of pumping quantities and control of the brackish water lens by monitoring of the groundwater salinity. For inclusion in public water supply, the groundwater should be treated by desalination.

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“…e wave-field characteristics can be utilized for the inversion imaging of a particular medium or anomaly. Seismic wave detection technology has been widely used in geotechnical engineering applications, boasting fast, lossless, and simple operation [3][4][5]. Scholars have studied the application of seismic wave detection technology for earth-rock dams.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Wave-Field Characteristics of Earth-Rock Dams with Different Hidden Hazards

Wang

Liu²,

Zou

et al. 2018

Advances in Civil Engineering

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e three-dimensional wave-field characteristics of dangerous earth-rock dams are the premise and foundation to identify the hidden hazards of the earth-rock dams via wave test method. Based on the equivalent elastic wave theory in isotropic mediums, the three-dimensional wave field of earth-rock dams with different defects was calculated using the finite element numerical simulation method. e characteristic and regularity of the three-dimensional wave field was explored. e result of the analysis shows that the size and position of the defects are closely related with the wave-field information received on the dam surface. e elasticity modulus and density of the defects have great effect on the wave field, and alternately, Poisson's ratio of the defects has little effect on the wave field. e greater the difference between the wave velocity of the hazardous materials and the dam body is, the stronger the energy of the scattered wave will be, which in turn will produce clearer lineups of the scattered wave on the timehistory profile. For a single wave movement signal, the dominant frequency amplitude is exponentially correlated with the longitudinal wave velocity of the hazardous materials. erefore, in the process of wave detection for earth-rock dam hazards, the effect of the elasticity modulus, density, and wave velocity on the test signal should be taken into account. e dominant frequency amplitude can serve as one of the control parameters for interpretation of dam hazards by the analysis of the wave test signal.

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Joint inversion of 2D resistivity and seismic travel time data to image saltwater intrusion over karstic areas

Cited by 28 publications

References 32 publications

Delineation of Saline-Water Intrusion Using Surface Geoelectrical Method in Jahanian Area, Pakistan

Delineation of Saline-Water Intrusion Using Surface Geoelectrical Method in Jahanian Area, Pakistan

Defining a general hydrogeological model for Susak Island, Adriatic Sea, Croatia

Three-Dimensional Wave-Field Characteristics of Earth-Rock Dams with Different Hidden Hazards

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