TY - GEN

T1 - Geophysical investigation of an earth dam

T2 - 11th EAGE International Scientific and Practical Conference and Exhibition on Engineering and Mining Geophysics, Geophysics 2015

AU - Titov, K. V.

AU - Konosavsky, P. K.

AU - Marenko, A. M.

N1 - Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2015

Y1 - 2015

N2 - We applied refraction seismic and electrical (induced polarization and self-potential) methods to study an internal structure of an earth dam. The dam 1400 m long produces a strong hydraulic head difference (of about 40 m). It forms a large water storage basin and is a part of hydroelectric power plant. Combined analysis of seismic and electrical data allowed us to characterize the piesometric surface within the dam and to obtain the bedrock depth. Based on induced polarization and resistivity data we assessed the transmissibility of an aquifer present within the dam. Self-Potential data show large values of electrical potential of electrokinetic origin because of very low electrical conductivity of surface and groundwater. The Self-Potential distribution was first analyzed qualitatively, which allowed determining two areas: the first area is characterized by a uniform groundwater flow, and the second area shows a complicated strongly three-dimensional flow. Then the groundwater flow model was obtained on the basis of ModFlow software. The Self-Potential was also calculated based on hydraulic head and electrical resistivity distributions. By trial and errors the initial model was corrected in order to obtain an agreement between the measured and modeled Self-Potential signals.

AB - We applied refraction seismic and electrical (induced polarization and self-potential) methods to study an internal structure of an earth dam. The dam 1400 m long produces a strong hydraulic head difference (of about 40 m). It forms a large water storage basin and is a part of hydroelectric power plant. Combined analysis of seismic and electrical data allowed us to characterize the piesometric surface within the dam and to obtain the bedrock depth. Based on induced polarization and resistivity data we assessed the transmissibility of an aquifer present within the dam. Self-Potential data show large values of electrical potential of electrokinetic origin because of very low electrical conductivity of surface and groundwater. The Self-Potential distribution was first analyzed qualitatively, which allowed determining two areas: the first area is characterized by a uniform groundwater flow, and the second area shows a complicated strongly three-dimensional flow. Then the groundwater flow model was obtained on the basis of ModFlow software. The Self-Potential was also calculated based on hydraulic head and electrical resistivity distributions. By trial and errors the initial model was corrected in order to obtain an agreement between the measured and modeled Self-Potential signals.

UR - http://www.scopus.com/inward/record.url?scp=85070729131&partnerID=8YFLogxK

U2 - 10.3997/2214-4609.201412272

DO - 10.3997/2214-4609.201412272

M3 - Conference contribution

SN - 9789462821385

T3 - Geophysics 2015 - 11th EAGE International Scientific and Practical Conference and Exhibition on Engineering and Mining Geophysics

SP - 52

BT - Geophysics 2015 - 11th EAGE International Scientific and Practical Conference and Exhibition on Engineering and Mining Geophysics

PB - European Association of Geoscientists and Engineers

Y2 - 20 April 2015 through 24 April 2015

ER -