It is important to evaluate and monitor the environmental impacts by the activity in our hand with appropriate methods, and the geophysical techniques have often been used in the subsurface environmental monitoring an...It is important to evaluate and monitor the environmental impacts by the activity in our hand with appropriate methods, and the geophysical techniques have often been used in the subsurface environmental monitoring and remediation processes. In the study an electromagnetic survey （EM） is performed to delineate deeply the extent of contamination at an industrial abandoned site, to detect the spread of groundwater and soil contamination, to locate possible pathways of leachate plumes. Based on the analysis of the geophysical anomaly of electrical conductivity, the survey area is delineated into three zones： original zone, transitional zone and contaminated zone. It was inferred that the high conductivity zones correspond to the contaminated zones of groundwater and soil. The survey demonstrates that EM method has the ability to measure small changes in subsurface properties involving ground water and is sensitive to the conductive layers. The measurement shows the behavior of groundwater and soil contamination and the position of groundwater pipelines, and it is beneficial to help waste management processes and to determine possible locations of monitoring wells so as to monitor the environment in the survey area in the future.展开更多
The geology and hydro-geophysical features can aid in identifying borehole location.The study aims to investigate groundwater aquifers and best location of boreholes in the crystalline basement area of Abu Zabad near ...The geology and hydro-geophysical features can aid in identifying borehole location.The study aims to investigate groundwater aquifers and best location of boreholes in the crystalline basement area of Abu Zabad near El Obeid Southwest,Sudan.The study area is underlain by two aquifers formations from Precambrian age.The oldest units of basement complex of area under investigation consist of metamorphic rocks including gneiss,schist,and quartzite.The geophysical methods electromagnetic(EM)and vertical electrical sounding(VES)surveys showed that best aquifers yield for construction of boreholes are in weathering and fractures formation.The EM results revealed that structural features are significant for groundwater potential and interpretation of the VES data also revealed four geo-electric layers,but generally two distinct lithologic layers,which include Superficial deposit and bedrock-basement respectively.The curves generated from the data revealed H curve and HK curve,and thickness of these layers varies from 15 m to 50 m in the area.The aquifer thickness range from 20 m to 30 m.The study concludes that these techniques are suitable for identifying borehole location in the basement rock in Abu Zabad Area Sudan.展开更多
文摘It is important to evaluate and monitor the environmental impacts by the activity in our hand with appropriate methods, and the geophysical techniques have often been used in the subsurface environmental monitoring and remediation processes. In the study an electromagnetic survey （EM） is performed to delineate deeply the extent of contamination at an industrial abandoned site, to detect the spread of groundwater and soil contamination, to locate possible pathways of leachate plumes. Based on the analysis of the geophysical anomaly of electrical conductivity, the survey area is delineated into three zones： original zone, transitional zone and contaminated zone. It was inferred that the high conductivity zones correspond to the contaminated zones of groundwater and soil. The survey demonstrates that EM method has the ability to measure small changes in subsurface properties involving ground water and is sensitive to the conductive layers. The measurement shows the behavior of groundwater and soil contamination and the position of groundwater pipelines, and it is beneficial to help waste management processes and to determine possible locations of monitoring wells so as to monitor the environment in the survey area in the future.
文摘The geology and hydro-geophysical features can aid in identifying borehole location.The study aims to investigate groundwater aquifers and best location of boreholes in the crystalline basement area of Abu Zabad near El Obeid Southwest,Sudan.The study area is underlain by two aquifers formations from Precambrian age.The oldest units of basement complex of area under investigation consist of metamorphic rocks including gneiss,schist,and quartzite.The geophysical methods electromagnetic(EM)and vertical electrical sounding(VES)surveys showed that best aquifers yield for construction of boreholes are in weathering and fractures formation.The EM results revealed that structural features are significant for groundwater potential and interpretation of the VES data also revealed four geo-electric layers,but generally two distinct lithologic layers,which include Superficial deposit and bedrock-basement respectively.The curves generated from the data revealed H curve and HK curve,and thickness of these layers varies from 15 m to 50 m in the area.The aquifer thickness range from 20 m to 30 m.The study concludes that these techniques are suitable for identifying borehole location in the basement rock in Abu Zabad Area Sudan.
