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Số người truy cập: 106,081,008
Imaging the movement of toxic pollutants with 2D electrical resistivity tomography (ERT) in the geological environment of the Hoa Khanh Industrial Park, Da Nang, Vietnam.
Tác giả hoặc Nhóm tác giả:
Le Phuoc Cuong
1
• Luong Van Tho
2
• Tatjana Juzsakova
3
• A ´ kos Re ´dey
3
• Hoang Hai
4
1
The University of Danang, University of Science and
Technology, 54 Nguyen Luong Bang st., Lien Chieu,
Danang, Vietnam
2
The University of Danang, University of Education, Danang,
Vietnam, 459 Ton Duc Thang st., Lien Chieu, Danang,
Vietnam
3
Institute of Environmental Engineering, University of
Pannonia, Egyetem utca 10, 8200 Veszprem, Hungary
4
The University of Danang, 41 Le Duan st., Hai Chau,
Danang
Nơi đăng:
Environ Earth (Sci );
S
ố:
75:286 (2016);
Từ->đến trang
: từ trang 250 đến trang 264;
Năm:
2016
Lĩnh vực:
Môi trường;
Loại:
Bài báo khoa học;
Thể loại:
Quốc tế
TÓM TẮT
This study presents the results of a geophysical
survey undertaken by 2D electrical resistivity tomography
(ERT) along two traverses. The study was conducted
between an industrial park (IP) and a residential area
bounding the Hoa Khanh Industrial Park, Da Nang, Vietnam. The first traverse, 300 m long, which is at the
boundary between the industrial park and Bau Tram Lake,
includes 504 measured data points. The second traverse,
which includes 189 measured data points, is 200 m in
length and runs alongside the boundary between Bau Tram
Lake and the residential area. Bau Tram Lake is located
between the IP and the residential area and acts as a natural
boundary. After discarding noisy data points, the data were
processed using the commercial software Res2dinv which
creates a 2D visual section of the resistivity distribution
below surface using a finite difference algorithm and the
method of least squares inversion. The result of an inversion, which is a simulated 2D resistivity image of the
subsurface or Electrical Resistivity Tomogram (ERT),
showed the formation characteristics and geological
structure along the first traverse from surface to 39.4 m in
depth, including two overlapping geological layers with
indistinctive local boundaries. The resulting image illustrates the amalgamation of anthropometric transported soil
and rocks with local lake material, brought into the lake
from other areas, to fill up the lake with rock and improve
the engineering foundation for the construction of the
industrial park buildings. The research results show that the
main components of the second geological layer on both
sides of the survey area have the same electrical signature
associated with black mud and sand and represent the
natural lake sediments. The inferred groundwater level
identified in the electrical imagery and two boreholes
corresponds approximately to the water level in Bau Tram
Lake. At a depth of approximately 10 m along both traverses, the groundwater in Bau Tram Lake and the surrounding residential areas is contaminated by electrolytes
and heavy metals. Furthermore, the groundwater inside the
industrial park contains a significant amount of industrial
electrolytes (with a high probability of chemicals such as
KCl, NaCl) and heavy metal contamination (with a high
probability of elements such as Pb, Hg, Zn) at a greater
density than measured in the residential areas. This suggests that Bau Tram Lake acts as a filter to strongly reduce
the movement of these toxic substances from seeping into
the groundwater below the residential area.
ABSTRACT
This study presents the results of a geophysical
survey undertaken by 2D electrical resistivity tomography
(ERT) along two traverses. The study was conducted
between an industrial park (IP) and a residential area
bounding the Hoa Khanh Industrial Park, Da Nang, Vietnam. The first traverse, 300 m long, which is at the
boundary between the industrial park and Bau Tram Lake,
includes 504 measured data points. The second traverse,
which includes 189 measured data points, is 200 m in
length and runs alongside the boundary between Bau Tram
Lake and the residential area. Bau Tram Lake is located
between the IP and the residential area and acts as a natural
boundary. After discarding noisy data points, the data were
processed using the commercial software Res2dinv which
creates a 2D visual section of the resistivity distribution
below surface using a finite difference algorithm and the
method of least squares inversion. The result of an inversion, which is a simulated 2D resistivity image of the
subsurface or Electrical Resistivity Tomogram (ERT),
showed the formation characteristics and geological
structure along the first traverse from surface to 39.4 m in
depth, including two overlapping geological layers with
indistinctive local boundaries. The resulting image illustrates the amalgamation of anthropometric transported soil
and rocks with local lake material, brought into the lake
from other areas, to fill up the lake with rock and improve
the engineering foundation for the construction of the
industrial park buildings. The research results show that the
main components of the second geological layer on both
sides of the survey area have the same electrical signature
associated with black mud and sand and represent the
natural lake sediments. The inferred groundwater level
identified in the electrical imagery and two boreholes
corresponds approximately to the water level in Bau Tram
Lake. At a depth of approximately 10 m along both traverses, the groundwater in Bau Tram Lake and the surrounding residential areas is contaminated by electrolytes
and heavy metals. Furthermore, the groundwater inside the
industrial park contains a significant amount of industrial
electrolytes (with a high probability of chemicals such as
KCl, NaCl) and heavy metal contamination (with a high
probability of elements such as Pb, Hg, Zn) at a greater
density than measured in the residential areas. This suggests that Bau Tram Lake acts as a filter to strongly reduce
the movement of these toxic substances from seeping into
the groundwater below the residential area.
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