TY - GEN

T1 - Peculiarities of Bottom Lake Sediments Studies Performed within Urban Borders by Geophysical Methods

AU - Бобров, Никита Юрьевич

AU - Богомолов, Николай Юрьевич

AU - Половков, Вячеслав Владимирович

AU - Рыбалко, Александр Евменьевич

N1 - Publisher Copyright: © Engineering and Mining Geophysics 2020. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2020/9/14

Y1 - 2020/9/14

N2 - The results of geophysical work carried out in 2019 by the Integrated Marine Research Center of Saint-Petersburg State University (IMRC SPbU) on Suzdal Lakes, Saint-Petersburg, are presented. The work was a part of comprehensive environmental survey of the city reservoirs. The methods of ultrahighresolution seismoacoustics, georadiolocation (GPR) and electrical resistivity tomography (ERT) were used. The main goal of geophysical work was to determine the thickness of bottom sediments to evaluate the shape of lake basins. The work has demonstrated that gas saturation of silt enriched with biological material does not allow us to use seismoacoustics for identification the thickness and structure of bottom sediments in the urban area. GPR with a low-frequency antenna has shown rather high efficiency in studying bottom sediments at depths less than about 2 m. However, high water mineralization, typical of urban reservoirs, leading to a strong attenuation of electromagnetic pulses with depth, limits the use of GPR at greater depths. To study bottom sediments to the entire depth and determine the shape of lake basins under conditions of high electrical conductivity of water and/or gas-saturated sediments, ERT method can be recommended, including continuous resistivity profiling (CRP) technique for large water reservoirs.

AB - The results of geophysical work carried out in 2019 by the Integrated Marine Research Center of Saint-Petersburg State University (IMRC SPbU) on Suzdal Lakes, Saint-Petersburg, are presented. The work was a part of comprehensive environmental survey of the city reservoirs. The methods of ultrahighresolution seismoacoustics, georadiolocation (GPR) and electrical resistivity tomography (ERT) were used. The main goal of geophysical work was to determine the thickness of bottom sediments to evaluate the shape of lake basins. The work has demonstrated that gas saturation of silt enriched with biological material does not allow us to use seismoacoustics for identification the thickness and structure of bottom sediments in the urban area. GPR with a low-frequency antenna has shown rather high efficiency in studying bottom sediments at depths less than about 2 m. However, high water mineralization, typical of urban reservoirs, leading to a strong attenuation of electromagnetic pulses with depth, limits the use of GPR at greater depths. To study bottom sediments to the entire depth and determine the shape of lake basins under conditions of high electrical conductivity of water and/or gas-saturated sediments, ERT method can be recommended, including continuous resistivity profiling (CRP) technique for large water reservoirs.

UR - http://www.scopus.com/inward/record.url?scp=85099719028&partnerID=8YFLogxK

U2 - 10.3997/2214-4609.202051041

DO - 10.3997/2214-4609.202051041

M3 - Conference contribution

AN - SCOPUS:85099719028

T3 - Engineering and Mining Geophysics 2020

SP - 1

EP - 11

BT - Engineering and Mining Geophysics 2020

PB - European Association of Geoscientists and Engineers

Y2 - 14 September 2020 through 18 September 2020

ER -