Resistivity and IP survey for delineating saline water and fresh water zones

Roy, Kalyan Kumar; Elliott, Harvey

doi:10.1016/0016-7142(80)90026-5

Cited by 39 publications

(12 citation statements)

References 11 publications

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“…Other authors (Dakhnov andDobrinin 1960, Collar 1979) have also attempted to use empirical equations involving I P that were based on laboratory data to estimate in situ sandstone permeability. Recently, Roy and Elliot (1980) have concluded that a simultaneous decrease in I P and resistivity response is diagnostic of saline water zones.…”

Section: Introductionmentioning

confidence: 99%

A Laboratory Investigation of the Induced Polarization of the Triassic Sherwood Sandstone of Lancashire and Its Hydrogeological Applications*

Olorunfemi

Griffiths

1985

Geophysical Prospecting

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The time‐domain induced polarization (IP) of saturated Sherwood Sandstone correlates significantly with the intergranular permeability and the matrix conductivity but only at low electrolyte concentrations (< 500 p.p.m. NaCl). An increase in the magnitude of sandstone IP with increase in the valence of the electrolyte cation is pronounced but occurs only at intermediate concentrations, i.e., between 100 and 2500 p.p.m. Surface IP and resistivity depth sounding measurements, supplemented by data from laboratory measurements, can be used to estimate the groundwater conductivity and hence the salinity in a moderate to strongly saline sandstone aquifer.

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Section: Introductionmentioning

confidence: 99%

A Laboratory Investigation of the Induced Polarization of the Triassic Sherwood Sandstone of Lancashire and Its Hydrogeological Applications*

Olorunfemi

Griffiths

1985

Geophysical Prospecting

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“…The fictitious resistivity ρ a versus sounding length AB/2 curves can be interpreted by any standard automatic interpretation procedure. Auxiliary curves' set and a two-layer master chart are manually deployed for this purpose in Roy and Elliot (1980). Here, we employed an interactive Zohdy's (1989) VES interpretation algorithm.…”

Section: Fictitious Resistivity and Apparent Fictitious Resistivitymentioning

confidence: 99%

“…For resolving this problem, Patella (1972Patella ( , 1973 proposed the fictitious apparent resistivity (product of apparent resistivity and apparent chargeability) soundings, which are derived from combined VES and IPS for Schlumberger electrode configuration. Subsequently, Roy and Elliot (1980) adopted this method and implemented a manual interpretation of combined VES and IPS data pertaining to New Brunswick, Canada. However, to meet the real practical needs of analyzing voluminous data sets arising in coastal regions, cost-effective and reliable automated procedures have to be evolved.…”

Section: Introductionmentioning

confidence: 99%

Neural Network Based Automated Interpretation Algorithm for Combined Geophysical Soundings in Coastal Zones

Sastry

Tesfakiros

2006

Environ Monit Assess

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The fresh water availability in coastal aquifers is an important problem faced by a major part of world's population dwelling there. For in situ and dynamic characterization of seawater encroachment into coastal aquifers, electrical geophysical methods are better suited. However, the resolving power of such data in distinguishing saline sands from moist clays in the subsurface is very poor. To meet this aspect and also the problem of analyzing voluminous data sets, we propose a feed forward back-propagation neural network (BPNN) based approach for the analysis of combined vertical electrical and induced polarization soundings. Our method is tested on synthetic data computed from available geo-electric sections and prevailing subsurface geological information of coastal aquifers of East Coast of India. The synthetic data are comprised of 18 combined soundings spread over five profiles. 15 out of 18 are used for training the BPNN, while 3 are used for testing. The trained BPNN (one node each in each of the input and output layers and 18 hidden nodes) showed 84.85% accuracy in testing phase for distinguishing clays from saline sands. Our method is also tested on real data concerning a shaly aquifer in Bahia, Brazil yielding an overall accuracy of 84.9%, comparable to that of synthetic case; thereby validating our approach.

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“…Em investigações ambientais, a técnica da SEV desempenha papel importante na detecção e caracterização da poluição do subsolo e seus recursos hídricos (Roy & Elliott, 1980;Lima & Porsani, 1994). A aplicação de técnicas adequadas durante a fase de coleta de dados de SEV associada a métodos robustos de interpretação permite estimar parâmetros importantes na caracterização geológico-hidrológica de áreas de disposição de resíduos tais como a profundidade da rocha sã, a profundidade do nível estático e a direção do fluxo da água subterrânea.…”

Section: Geofísicaunclassified

Geofísica elétrica na caracterização da hidrologia subterrânea na região do Aterro Metropolitano Centro, Salvador, Bahia

Cavalcanti¹,

Sato²,

Lima³

2001

Rev. Bras. Geof.

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Research ArticleDados de sondagens elétricas verticais de resistividade, de polarização induzida (PI), e medidas superficiais de potencial espontâneo (PE), permitiram avaliar as condições hidrológicas subterrâneas na região do novo aterro sanitário de Salvador, Bahia, antes de sua efetiva utilização. A inversão conjunta dos dados de PI-resistividade permitiu diferenciar zonas de maior argilosidade nos arenitos da Formação Barreiras. Permitiu também mapear a topografia do substrato aqüífero, a conformação do nível do lençol freático e os padrões gerais da circulação subterrânea de água nessa formação. Os dados de PE, obtidos em torno das duas primeiras células já construídas para disposição do lixo, confirmam a orientação geral do fluxo hídrico e definem as principais áreas de recarga e descarga no entorno das células. O quadro hidrológico-petrofísico resultante constitui um referencial útil para checar eventuais danos ambientais futuros relacionados à disposição de lixo urbano na área. Palavras-chave:Resistividade elétrica; Polarização induzida; Hidrologia; Água subterrânea; Aterro sanitário. ELECTRICAL GEOPHYSICS IN THE SUBSURFACE HYDROLOGY CHARACTERIZATION AROUND THE SALVADOR'S SANITARY LANDFILL AREA, STATE OF BAHIA -Resistivity and induced polarization (IP) vertical

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Resistivity and IP survey for delineating saline water and fresh water zones

Cited by 39 publications

References 11 publications

A Laboratory Investigation of the Induced Polarization of the Triassic Sherwood Sandstone of Lancashire and Its Hydrogeological Applications*

A Laboratory Investigation of the Induced Polarization of the Triassic Sherwood Sandstone of Lancashire and Its Hydrogeological Applications*

Neural Network Based Automated Interpretation Algorithm for Combined Geophysical Soundings in Coastal Zones

Geofísica elétrica na caracterização da hidrologia subterrânea na região do Aterro Metropolitano Centro, Salvador, Bahia

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