Youssef M O H A M M E D Youssef | Suez University Faculty of Petroleum and Mining Engineering (original) (raw)
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Papers by Youssef M O H A M M E D Youssef
The present study wascarried out to delineate the location, extension, trend and depth of subsurf... more The present study wascarried out to delineate the location, extension, trend and depth of subsurface structures of Alamein area. To achieve this aim, the gravity and aeromagnetic data have been subjected to different analytical techniques. The Fast Fourier Transform technique was used to separatethe residual components from the regional ones. The resulted maps showed that the area was affected mainly bytheENE, E-W, WNWand NWtectonic trends. In addition, spectral analysis technique was applied on magnetic anomalies to estimate the depth to basement surface, which varies from 3.03 in southern part to 7.24 Km in northern part.3D-Eulerdeconvloution and tilt angle derivative techniques were carried out to detect the edges of magnetic sources and to determine their depths.Correlation between them shows acoincidence between Euler solution and zero lines of tilt angle map. A tentative basement structure map is constructed from the integration of these results and geological information. This map shows alternative uplifted and downfaulted structure trending in the ENE, NE and E-W directions. In addition, the NNW to NW strike-slip faults intersected them in later events. Finally, 2-D modeling technique was run on three gravity and magnetic profiles in the same location. Different drilled wells and the constructed basement structure map support these modeled profiles. Theyshow an acidic basement rocks. A general decreasing of Conrad discontinuity depths from about 20.5 km at southern part to 17.9 km at northern part can be noticed. Moreover, the crustal thickness (depth to Moho discontinuity), varies between 31.5 and 28.5 km revealing visibly crustal stretching and thinning northerly.
Conference Presentations by Youssef M O H A M M E D Youssef
Earth and Space Science Open Archive, 2020
In coastal regions, more precaution for urban expansion should be considered regarding hidden geo... more In coastal regions, more precaution for urban expansion should be considered regarding hidden
geological hazard from the existence of expansive clay soil and shallow groundwater level. These
conditions cause huge damage to engineering constructions that leads to losses of human lives and
financial property. However, very little studies were focused on hazard assessment of swelling clay
potentiality using GIS approach, because its natures as occur slowly by time. The purpose of the present
work is the analysis of geological–geotechnical factors to present a geo-hazard risk assessment model for
the identification of high risk-prone regions in the coastal zone using an integrated GIS statistical system
and Electrical Resistivity Tomography (ERT) mapping. Suez city (the case study area) is located in the
northwest of the Gulf of Suez that has a vital and attractive global location for trading and investment. The
geo-hazard model was created in a GIS environment by integrating thematic maps of possible controlling
factors from ALOS-DEM image and available geological and geotechnical boreholes. These factors
showed a varied ranges: slope (0-35°), elevation (0-50 m), superficial soil (Conglomerate to silty clay), clay
thickness (0-25 m), depth to groundwater (0-20 m), TDS (1000-35000 ppm), Cl-1 (500-17000 ppm), So4
(250-9000 ppm) and pH (6.8-8.7) and in conjunction with swelling potentiality (Liquid Limit (LL) (35-88
%), Plastic Index (PI) (12-62 %) and free Swelling (Sf) (35-150 %)). Assessment these factors causes kind
of uncertainty during the evaluation procedure, thus all thematic maps were scored and weighted
according to specified criteria to produce severity distributions maps. The crucial relationships between
surface and subsurface factors were identified by employing geospatial qualitative and Pearson'
correlation analysis. In the considered case, the clay soil is an inorganic cohesive type of high to a very
high swelling degree. Among tested factors, the existence of clay soil and its thickness seem to play an
important role to increase groundwater level that approach surface in several sites of Suez city, hence
rising the risks of Total Dissolved Salts (TDS), Chloride (Cl-1), and augmenting swelling potential.
Accordingly, the designed suitable relative weights were determined and all thematic maps were
combined to produce a geo-hazard map using Simple Weighting Overlay (SWO) method. This approach
illustrates the significant factors and the arithmetic weights assigned to each level of severity, and
therefore they should be considered in similar studies. Geo-hazard map was produced with four degrees
of severity for urban development: low, marginal, severe and very severe comprising 36.38, 40.28, 22.13
and 1.2 %, respectively, of the study area. The very severe area was observed mainly around El Kapanon
district. An extensive field survey was performed, noted significantly high saline groundwater move into
the sewage system. Seven 2D- ERT profiles were executed in this region using Dipole-Dipole (DD) array
that integrated with available boreholes to establish a clear image for subsurface layers. The topsoil
identified as gravelly sand (> 30 Ωm) extending down to - 3 m (a.s.l). A low resistivity layer (< 4 Ωm)
attribute to thick silty clay observed underlined this topsoil, the clay behaviour in this area characterized
by high swelling potentiality as indicated from near boreholes SZ-3 to SZ-7. The inverted sections were used to create a 3D visualization by fitting all DD profiles. The result displays the existence of a buried
channel of gravelly sand extending from the shoreline to city and underlined by thick clay soil more than
10 m that reduced the vertical infiltration rate. This suggested a lateral invasion of seawater usually
occurred from a coastal part to the residential area during high tidal events in winter seasons. This
continuous wetting caused the high salinity values and clay swelling measurements in this site. Therefore,
government and urban planning should seriously consider treating proper action for current problematic
conditions, before they become worse and affect the future development plan in this area. Overall, the
results obtained in this study suggest that the GIS-based hazard model combined with localized ERT
survey can be a vigorous tool for planning and management, by identifying the appropriate sites for
environmental interventions and/or engineering risks.
The present study wascarried out to delineate the location, extension, trend and depth of subsurf... more The present study wascarried out to delineate the location, extension, trend and depth of subsurface structures of Alamein area. To achieve this aim, the gravity and aeromagnetic data have been subjected to different analytical techniques. The Fast Fourier Transform technique was used to separatethe residual components from the regional ones. The resulted maps showed that the area was affected mainly bytheENE, E-W, WNWand NWtectonic trends. In addition, spectral analysis technique was applied on magnetic anomalies to estimate the depth to basement surface, which varies from 3.03 in southern part to 7.24 Km in northern part.3D-Eulerdeconvloution and tilt angle derivative techniques were carried out to detect the edges of magnetic sources and to determine their depths.Correlation between them shows acoincidence between Euler solution and zero lines of tilt angle map. A tentative basement structure map is constructed from the integration of these results and geological information. This map shows alternative uplifted and downfaulted structure trending in the ENE, NE and E-W directions. In addition, the NNW to NW strike-slip faults intersected them in later events. Finally, 2-D modeling technique was run on three gravity and magnetic profiles in the same location. Different drilled wells and the constructed basement structure map support these modeled profiles. Theyshow an acidic basement rocks. A general decreasing of Conrad discontinuity depths from about 20.5 km at southern part to 17.9 km at northern part can be noticed. Moreover, the crustal thickness (depth to Moho discontinuity), varies between 31.5 and 28.5 km revealing visibly crustal stretching and thinning northerly.
Earth and Space Science Open Archive, 2020
In coastal regions, more precaution for urban expansion should be considered regarding hidden geo... more In coastal regions, more precaution for urban expansion should be considered regarding hidden
geological hazard from the existence of expansive clay soil and shallow groundwater level. These
conditions cause huge damage to engineering constructions that leads to losses of human lives and
financial property. However, very little studies were focused on hazard assessment of swelling clay
potentiality using GIS approach, because its natures as occur slowly by time. The purpose of the present
work is the analysis of geological–geotechnical factors to present a geo-hazard risk assessment model for
the identification of high risk-prone regions in the coastal zone using an integrated GIS statistical system
and Electrical Resistivity Tomography (ERT) mapping. Suez city (the case study area) is located in the
northwest of the Gulf of Suez that has a vital and attractive global location for trading and investment. The
geo-hazard model was created in a GIS environment by integrating thematic maps of possible controlling
factors from ALOS-DEM image and available geological and geotechnical boreholes. These factors
showed a varied ranges: slope (0-35°), elevation (0-50 m), superficial soil (Conglomerate to silty clay), clay
thickness (0-25 m), depth to groundwater (0-20 m), TDS (1000-35000 ppm), Cl-1 (500-17000 ppm), So4
(250-9000 ppm) and pH (6.8-8.7) and in conjunction with swelling potentiality (Liquid Limit (LL) (35-88
%), Plastic Index (PI) (12-62 %) and free Swelling (Sf) (35-150 %)). Assessment these factors causes kind
of uncertainty during the evaluation procedure, thus all thematic maps were scored and weighted
according to specified criteria to produce severity distributions maps. The crucial relationships between
surface and subsurface factors were identified by employing geospatial qualitative and Pearson'
correlation analysis. In the considered case, the clay soil is an inorganic cohesive type of high to a very
high swelling degree. Among tested factors, the existence of clay soil and its thickness seem to play an
important role to increase groundwater level that approach surface in several sites of Suez city, hence
rising the risks of Total Dissolved Salts (TDS), Chloride (Cl-1), and augmenting swelling potential.
Accordingly, the designed suitable relative weights were determined and all thematic maps were
combined to produce a geo-hazard map using Simple Weighting Overlay (SWO) method. This approach
illustrates the significant factors and the arithmetic weights assigned to each level of severity, and
therefore they should be considered in similar studies. Geo-hazard map was produced with four degrees
of severity for urban development: low, marginal, severe and very severe comprising 36.38, 40.28, 22.13
and 1.2 %, respectively, of the study area. The very severe area was observed mainly around El Kapanon
district. An extensive field survey was performed, noted significantly high saline groundwater move into
the sewage system. Seven 2D- ERT profiles were executed in this region using Dipole-Dipole (DD) array
that integrated with available boreholes to establish a clear image for subsurface layers. The topsoil
identified as gravelly sand (> 30 Ωm) extending down to - 3 m (a.s.l). A low resistivity layer (< 4 Ωm)
attribute to thick silty clay observed underlined this topsoil, the clay behaviour in this area characterized
by high swelling potentiality as indicated from near boreholes SZ-3 to SZ-7. The inverted sections were used to create a 3D visualization by fitting all DD profiles. The result displays the existence of a buried
channel of gravelly sand extending from the shoreline to city and underlined by thick clay soil more than
10 m that reduced the vertical infiltration rate. This suggested a lateral invasion of seawater usually
occurred from a coastal part to the residential area during high tidal events in winter seasons. This
continuous wetting caused the high salinity values and clay swelling measurements in this site. Therefore,
government and urban planning should seriously consider treating proper action for current problematic
conditions, before they become worse and affect the future development plan in this area. Overall, the
results obtained in this study suggest that the GIS-based hazard model combined with localized ERT
survey can be a vigorous tool for planning and management, by identifying the appropriate sites for
environmental interventions and/or engineering risks.