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<p>The Gulf of Aqaba coast is witnessing an increase in constructing tourism development facilities, especially focused on South Sinai governorate. The need to protect these investments and ensure sustainable tourism development has led to the investigation of associated risks with geological processes in and around the study area. The current manuscript focused on applying near-surface geophysical techniques for evaluating the subsurface geologic setting of the Napq area for construction purposes, to provide an ample foundation for future planning. The geological mapping was utilized, as well as geophysical techniques (geoelectric resistivity, ground penetrating radar GPR, and seismic hazard analysis), which were applied for optimal land-use planning. The findings of the geophysical survey revealed a subsurface model consisting of four distinctive layers: the first layer ranged in resistivity from 133 to 3600 Ohm.m and was 0.5–1.3 m thick, which was represented by weathered alluvial deposits; the second layer had a resistivity ranging from 36 to 744 Ohm.m and was 3.1–8.2 m thick, equivalent to gravelly sand deposits; the third layer had a resistivity ranging from 10 to 24 Ohm.m and a thickness of 7.2–22.3 m, equivalent to saline saturated gravelly sand deposits, and ended with the fourth layer of fractured basement granite rocks with a resistivity &gt; 200 Ohm.m. The GPR survey supported and confirmed the gained results of geoelectric resistivity. The seismic hazard analysis indicated the levels of peak ground acceleration (PGA) that ranged between 0.15 and 0.17 g for an exposure period of 50 years, and as normally expected, PGA values increase to a value between 0.2 and 0.25 g for an exposure period of 100 years. Finally, all the acquired geophysical surveys were integrated and fitted together to generate an optimal land use plan for the Napq area for construction purposes. The study area can be classified into four distinctive main units: the first unit that can be the most suitable unit for construction and engineering purposes, which is represented by Quaternary wadi-fill deposits of sand and gravel horizontal layers; the second unit that can be suitable for construction purposes after checking the possibility of the presence of subsurface cavities; the third unit, which is avoided for any constructions, is bounded by the tracks of the flood plains and active faults, which can be used as open areas such as gardens and playgrounds; and the fourth unit, which is avoided for any engineering purposes, is represented by the western mountainous areas of the study area.</p>

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Geological and geophysical investigations for land-use planning in Nabq area, Sharm El-Sheikh, South Sinai, Egypt

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Essam A. Morsy

摘要

The Gulf of Aqaba coast is witnessing an increase in constructing tourism development facilities, especially focused on South Sinai governorate. The need to protect these investments and ensure sustainable tourism development has led to the investigation of associated risks with geological processes in and around the study area. The current manuscript focused on applying near-surface geophysical techniques for evaluating the subsurface geologic setting of the Napq area for construction purposes, to provide an ample foundation for future planning. The geological mapping was utilized, as well as geophysical techniques (geoelectric resistivity, ground penetrating radar GPR, and seismic hazard analysis), which were applied for optimal land-use planning. The findings of the geophysical survey revealed a subsurface model consisting of four distinctive layers: the first layer ranged in resistivity from 133 to 3600 Ohm.m and was 0.5–1.3 m thick, which was represented by weathered alluvial deposits; the second layer had a resistivity ranging from 36 to 744 Ohm.m and was 3.1–8.2 m thick, equivalent to gravelly sand deposits; the third layer had a resistivity ranging from 10 to 24 Ohm.m and a thickness of 7.2–22.3 m, equivalent to saline saturated gravelly sand deposits, and ended with the fourth layer of fractured basement granite rocks with a resistivity > 200 Ohm.m. The GPR survey supported and confirmed the gained results of geoelectric resistivity. The seismic hazard analysis indicated the levels of peak ground acceleration (PGA) that ranged between 0.15 and 0.17 g for an exposure period of 50 years, and as normally expected, PGA values increase to a value between 0.2 and 0.25 g for an exposure period of 100 years. Finally, all the acquired geophysical surveys were integrated and fitted together to generate an optimal land use plan for the Napq area for construction purposes. The study area can be classified into four distinctive main units: the first unit that can be the most suitable unit for construction and engineering purposes, which is represented by Quaternary wadi-fill deposits of sand and gravel horizontal layers; the second unit that can be suitable for construction purposes after checking the possibility of the presence of subsurface cavities; the third unit, which is avoided for any constructions, is bounded by the tracks of the flood plains and active faults, which can be used as open areas such as gardens and playgrounds; and the fourth unit, which is avoided for any engineering purposes, is represented by the western mountainous areas of the study area.