Research Activities

Land Subsidence

The Interferometric Synthetic Aperture Radar (InSAR) data and techniques were used to map locations and quantify rates of land subsidence in the Texas Coastal Bend region .

Publications:
  • Haley, M., Ahmed, M., Gebermichael, E, Murgulet, D., Starek, M., 2022, Land Subsidence in the Texas Coastal Bend: Locations, Rates, Triggers, and Consequences: Remote Sensing, v. 14, p. 192. https://doi.org/10.3390/rs14010192.

Geophysics Test Site

We constructed a GTS at Texas A&M University—Corpus Christi that contains several objects (e.g., steel drums, plastic drums, plastic buckets, steel pipes, and well covers) buried at different depths (depth range: 0.5–3 m) to simulate real-life situations

Publications:
  • Ahmed, M., Turner, R., Haley, M., Shyrigh, S., Colmenero, D., Penchala, T., 2020, Constructing a Geophysical Test Site for Coastal Community’s Research and Education Activities, The Leading Edge, v. 40, p. 2.8-2.13, doi: https://doi.org/10.1190/tle40030208.1

Availability and variability of freshwater resources in arid and semiarid environments

We investigate water resources availability and the natural (e.g., climate changes) and anthropogenic (e.g., groundwater extraction) factors controlling their spatiotemporal variability using GRACE, geological, geophysical, and remote sensing data, land surface models outputs, and GIS techniques.

Publications:

  • Ahmed, M., Wiese, D., 2019, Short-term trends in Africa’s freshwater resources: Magnitudes and drivers, Science of the Total Environment, v. 695, p. 133843,doi: https://doi.org/10.1016/j.scitotenv.2019.133843
  • Niyazi, B., Ahmed, M., Masoud, M., Rashed, M., Basahi, J., 2019, Sustainable and resilient management scenarios for groundwater resources of the Red Sea coastal aquifers, Science of the Total Environment, v. 690, p. 1310–1320, doi: https://doi.org/10.1016/j.scitotenv.2019.07.081
  • Sultan, M., Sturchio, N., Alsefry, S., Emil, M., Ahmed, M., Fathy, K., AbuAbdullah, M., Bettadpur, S., Save, H., Othman, A., Chouinard, K., 2019, Assessment of age, origin, and sustainability of fossil aquifers: A geochemical and remote sensing–based approach, Journal of Hydrology, v. 576, p. 325-341,doi: 10.1016/j.jhydrol.2019.06.017.
  • Abdelmohsen, K., Sultan, M., Ahmed, M., Save, H., Elkaliouby, B., Emil, M., Yan, E., Abotalib, A., Krishnamurthy, R., Abdelmalik, K., 2019, Response of deep aquifers to climate variability, Science of the Total Environment, v. 677, p. 530-544, doi: 10.1016/j.scitotenv.2019.04.316.
  • Niyazi, B., Ahmed, M., Basahi, J., Masoud, M., Rashed, M., 2018, Spatiotemporal trends in freshwater availability in the Red Sea Hills, Saudi Arabia, Arabian Journal of Geosciences, v. 702, p. 1-13, doi: 10.1007/s12517-018-4052-y.
  • Fallatah, O., Ahmed M., Cardace, D., Boving, T., Akanda, A., 2018, Assessment of Modern Recharge to Arid Region Aquifers Using Integrated Geophysical, Geochemical, and Remote Sensing Approaches, Journal of Hydrology, v. 569, p. 600 – 611, doi: 10.1016/j.jhydrol.2018.09.061.
  • Ahmed, M., Abdelmohsen, K., 2018, Quantifying Modern Recharge and Depletion Rates of the Nubian Aquifer in Egypt, Surveys in Geophysics, v. 39, p. 729-751, doi: 10.1007/s10712-018-9465-3
  • Fallatah, O., Ahmed M., Save, H., Akanda, A., 2017, Quantifying Temporal Variations in Water Resources of a Vulnerable Middle Eastern Transboundary Aquifer System. Hydrological Processes, v. 31, p. 4081-4091, doi: 10.1002/hyp.11285.
  • Ebead, B., Ahmed, M., Niu, Z., Huang, N., 2017, Quantifying the anthropogenic impact on groundwater resources of North China using GRACE and land surface models: Journal of Applied Remote Sensing,doi:10.1117/1.JRS.11.026029.
  • Mohamed, A., Sultan, M., Ahmed M., Yan, E., Ahmed, E., 2016, Aquifer recharge, depletion, and connectivity: inferences from GRACE, land surface models, geochemical, and geophysical data. Geological Society of America Bulletin, v. 129, p. 534-546, doi: 10.1130/B31460.1.
  • Ahmed, M., Sultan, M., Wahr, J., Yan, E., 2014, The use of GRACE data to monitor natural and anthropogenic induced variations in water availability across Africa: Earth Science Reviews, v. 136, p. 289–300, https://doi.org/10.1016/j.earscirev.2014.05.009
  • Sultan, M., Ahmed, M., Wahr, J., Yan, E., Emil, M., 2015, Monitoring Aquifer Depletion from Space: Case Studies from the Saharan and Arabian Aquifers, in Lakshmi, V., (Ed.), Remote Sensing of the Terrestrial Water Cycle, AGU Geophysical Monograph # 206, p. 347-366, doi: 10.1002/9781118872086.
  • Sultan, M., Ahmed, M., Sturchio, N., Yan, Y., Milewski, A., Becker, R., Wahr, J., Becker, D., Chouinard, K., 2013, Assessment of the Vulnerabilities of the Nubian Sandstone Fossil Aquifer, North Africa, in Roger A. Pielke (Ed.), Climate Vulnerability: Understanding and Addressing Threats to Essential Resources. Elsevier Inc., Academic Press, p. 311–333, ISBN: 978-0-12-384704-1

Aquifers recharge and depletion rates: Locations, and timing

We map recharge and depletion locations and quantify recharge and depletion rates and timing using geophysical (gravity, electric, electromagnetic, magnetic), geochemical (stable and radioactive isotopes), and remote sensing (TRMM, GPM, SMAP, etc.) data along with GIS technologies.

Publications:

  • Niyazi, B., Ahmed, M., Masoud, M., Rashed, M., Basahi, J., 2019, Sustainable and resilient management scenarios for groundwater resources of the Red Sea coastal aquifers, Science of the Total Environment, v. 690, p. 1310–1320, doi: https://doi.org/10.1016/j.scitotenv.2019.07.081
  • Sultan, M., Sturchio, N., Alsefry, S., Emil, M., Ahmed, M., Fathy, K., AbuAbdullah, M., Bettadpur, S., Save, H., Othman, A., Chouinard, K., 2019, Assessment of age, origin, and sustainability of fossil aquifers: A geochemical and remote sensing–based approach, Journal of Hydrology, v. 576, p. 325-341,doi: 10.1016/j.jhydrol.2019.06.017.
  • Abdelmohsen, K., Sultan, M., Ahmed, M., Save, H., Elkaliouby, B., Emil, M., Yan, E., Abotalib, A., Krishnamurthy, R., Abdelmalik, K., 2019, Response of deep aquifers to climate variability, Science of the Total Environment, v. 677, p. 530-544, doi: 10.1016/j.scitotenv.2019.04.316.
  • Fallatah, O., Ahmed M., Cardace, D., Boving, T., Akanda, A., 2018, Assessment of Modern Recharge to Arid Region Aquifers Using Integrated Geophysical, Geochemical, and Remote Sensing Approaches, Journal of Hydrology, v. 569, p. 600 – 611, doi: 10.1016/j.jhydrol.2018.09.061.
  • Ahmed, M., Abdelmohsen, K., 2018, Quantifying Modern Recharge and Depletion Rates of the Nubian Aquifer in Egypt, Surveys in Geophysics, v. 39, p. 729-751, doi: 10.1007/s10712-018-9465-3
  • Mohamed, A., Sultan, M., Ahmed M., Yan, E., Ahmed, E., 2016, Aquifer recharge, depletion, and connectivity: inferences from GRACE, land surface models, geochemical, and geophysical data. Geological Society of America Bulletin, v. 129, p. 534-546, doi: 10.1130/B31460.1.
  • Mohamed, L., Sultan, M., Ahmed, M., Zaki, A., Sauck, W., Soliman, F., Yan, E., Elkadiri, R., Aboelmagd, A., 2015, Structural controls on groundwater flow in basement terrains: Geophysical, remote sensing, and field investigations in Sinai: Surveys in Geophysics, v. 36, p. 717–742, doi: 10.1007/s10712-015-9331-5.
  • Dailey, D., Sauck, W., Sultan, M., Milewski, A., Ahmed, M., Laton, R., Foster, J., Elkederi, R., Schmidt, C., Alharbi, T., 2015, Geophysical, remote sensing, GIS, and geochemical applications for a better understanding of the structural controls on groundwater flow in the Mojave Desert, California: Journal of Hydrology: Regional Studies, v. 3, p. 211-232, https://doi.org/10.1016/j.ejrh.2014.12.002
  • Sultan, M., Ahmed, M., Wahr, J., Yan, E., Emil, M., 2015, Monitoring Aquifer Depletion from Space: Case Studies from the Saharan and Arabian Aquifers, in Lakshmi, V., (Ed.), Remote Sensing of the Terrestrial Water Cycle, AGU Geophysical Monograph # 206, p. 347-366, doi: 10.1002/9781118872086.
  • Ahmed, M., Sauck, W., Sultan, M., Yan, E., Soliman, F., Rashed, M., 2014, Geophysical constraints on the hydrogeologic and structural settings of the Gulf of Suez Rift–related basins: Case study from the El Qaa Plain, Sinai, Egypt: Surveys in Geophysics, v. 35, p. 415–430, doi: 10.1007/s10712-013-9259-6
  • Sultan, M., Ahmed, M., Sturchio, N., Yan, Y., Milewski, A., Becker, R., Wahr, J., Becker, D., Chouinard, K., 2013, Assessment of the Vulnerabilities of the Nubian Sandstone Fossil Aquifer, North Africa, in Roger A. Pielke (Ed.), Climate Vulnerability: Understanding and Addressing Threats to Essential Resources. Elsevier Inc., Academic Press, p. 311–333, ISBN: 978-0-12-384704-1
  • Becker, D., Sultan, M., Milewski, A., Becker, R., Sauck, W., Soliman, F., Rashed, M., Ahmed, M., Yan, E., Wagdy, A., Chouinard, K., Welton, B., 2012, Integrated solutions for hydrologic investigations in arid lands: Geosphere, v. 8, p. 1588–1605, doi: 10.1130/GES00777.1
  • Sultan, M., Metwally, S., Milewski, A., Becker, D., Ahmed, M., Sauck, W., Soliman, F., Sturchio, N., Yan E., Rashed, M., Wagdy, A., Becker, R., Welton, B., 2011, Modern recharge to fossil aquifers: Geochemical, geophysical, and modeling constraints: Journal of Hydrology, v. 403, p. 14–24, https://doi.org/10.1016/j.jhydrol.2011.03.036
  • Sultan, M., Yousef, A. F., Metwally, S.E., Becker, R., Milewski, A., Sauck, W., Sturchio, N., Mohamed, A., Wagdy, A., El Alfy, Z., Soliman, F., Rashed, M., Becker, D., Sagintayev, Z., Ahmed, M., Welton, B., 2010, Red Sea rifting controls on aquifer distribution: Constraints from geochemical, geophysical, and remote sensing data, Geological Society of America Bulletin, v. 123, p. 911–924, doi: 10.1130/B30146.1


Controls of geologic structures on groundwater accumulation and flow

We identify the role of various structural elements (i.e., shear zones, faults, and dykes) on groundwater accumulation and flow using geophysical (electric, electromagnetic, magnetic), remote sensing (LiDAR, ASTER, GeoEye, etc.) and geochemical (stable isotopes) methods along with GIS techniques.

Publications:

  • Niyazi, B., Ahmed, M., Masoud, M., Rashed, M., Basahi, J., 2019, Sustainable and resilient management scenarios for groundwater resources of the Red Sea coastal aquifers, Science of the Total Environment, v. 690, p. 1310–1320, doi: https://doi.org/10.1016/j.scitotenv.2019.07.081
  • Sultan, M., Sturchio, N., Alsefry, S., Emil, M., Ahmed, M., Fathy, K., AbuAbdullah, M., Bettadpur, S., Save, H., Othman, A., Chouinard, K., 2019, Assessment of age, origin, and sustainability of fossil aquifers: A geochemical and remote sensing–based approach, Journal of Hydrology, v. 576, p. 325-341,doi: 10.1016/j.jhydrol.2019.06.017.
  • Abdelmohsen, K., Sultan, M., Ahmed, M., Save, H., Elkaliouby, B., Emil, M., Yan, E., Abotalib, A., Krishnamurthy, R., Abdelmalik, K., 2019, Response of deep aquifers to climate variability, Science of the Total Environment, v. 677, p. 530-544, doi: 10.1016/j.scitotenv.2019.04.316.
  • Fallatah, O., Ahmed M., Cardace, D., Boving, T., Akanda, A., 2018, Assessment of Modern Recharge to Arid Region Aquifers Using Integrated Geophysical, Geochemical, and Remote Sensing Approaches, Journal of Hydrology, v. 569, p. 600 – 611, doi: 10.1016/j.jhydrol.2018.09.061.
  • Ahmed, M., Abdelmohsen, K., 2018, Quantifying Modern Recharge and Depletion Rates of the Nubian Aquifer in Egypt, Surveys in Geophysics, v. 39, p. 729-751, doi: 10.1007/s10712-018-9465-3
  • Mohamed, A., Sultan, M., Ahmed M., Yan, E., Ahmed, E., 2016, Aquifer recharge, depletion, and connectivity: inferences from GRACE, land surface models, geochemical, and geophysical data. Geological Society of America Bulletin, v. 129, p. 534-546, doi: 10.1130/B31460.1.
  • Mohamed, L., Sultan, M., Ahmed, M., Zaki, A., Sauck, W., Soliman, F., Yan, E., Elkadiri, R., Aboelmagd, A., 2015, Structural controls on groundwater flow in basement terrains: Geophysical, remote sensing, and field investigations in Sinai: Surveys in Geophysics, v. 36, p. 717–742, doi: 10.1007/s10712-015-9331-5.
  • Dailey, D., Sauck, W., Sultan, M., Milewski, A., Ahmed, M., Laton, R., Foster, J., Elkederi, R., Schmidt, C., Alharbi, T., 2015, Geophysical, remote sensing, GIS, and geochemical applications for a better understanding of the structural controls on groundwater flow in the Mojave Desert, California: Journal of Hydrology: Regional Studies, v. 3, p. 211-232, https://doi.org/10.1016/j.ejrh.2014.12.002
  • Sultan, M., Ahmed, M., Wahr, J., Yan, E., Emil, M., 2015, Monitoring Aquifer Depletion from Space: Case Studies from the Saharan and Arabian Aquifers, in Lakshmi, V., (Ed.), Remote Sensing of the Terrestrial Water Cycle, AGU Geophysical Monograph # 206, p. 347-366, doi: 10.1002/9781118872086.
  • Ahmed, M., Sauck, W., Sultan, M., Yan, E., Soliman, F., Rashed, M., 2014, Geophysical constraints on the hydrogeologic and structural settings of the Gulf of Suez Rift–related basins: Case study from the El Qaa Plain, Sinai, Egypt: Surveys in Geophysics, v. 35, p. 415–430, doi: 10.1007/s10712-013-9259-6
  • Sultan, M., Ahmed, M., Sturchio, N., Yan, Y., Milewski, A., Becker, R., Wahr, J., Becker, D., Chouinard, K., 2013, Assessment of the Vulnerabilities of the Nubian Sandstone Fossil Aquifer, North Africa, in Roger A. Pielke (Ed.), Climate Vulnerability: Understanding and Addressing Threats to Essential Resources. Elsevier Inc., Academic Press, p. 311–333, ISBN: 978-0-12-384704-1
  • Becker, D., Sultan, M., Milewski, A., Becker, R., Sauck, W., Soliman, F., Rashed, M., Ahmed, M., Yan, E., Wagdy, A., Chouinard, K., Welton, B., 2012, Integrated solutions for hydrologic investigations in arid lands: Geosphere, v. 8, p. 1588–1605, doi: 10.1130/GES00777.1
  • Sultan, M., Metwally, S., Milewski, A., Becker, D., Ahmed, M., Sauck, W., Soliman, F., Sturchio, N., Yan E., Rashed, M., Wagdy, A., Becker, R., Welton, B., 2011, Modern recharge to fossil aquifers: Geochemical, geophysical, and modeling constraints: Journal of Hydrology, v. 403, p. 14–24, https://doi.org/10.1016/j.jhydrol.2011.03.036
  • Sultan, M., Yousef, A. F., Metwally, S.E., Becker, R., Milewski, A., Sauck, W., Sturchio, N., Mohamed, A., Wagdy, A., El Alfy, Z., Soliman, F., Rashed, M., Becker, D., Sagintayev, Z., Ahmed, M., Welton, B., 2010, Red Sea rifting controls on aquifer distribution: Constraints from geochemical, geophysical, and remote sensing data, Geological Society of America Bulletin, v. 123, p. 911–924, doi: 10.1130/B30146.1

Assessing and calibrating land surface models

We calibrate land surface models over Africa using GRACE and other relevant geophysical, geological, and remote sensing data.

Publications:

  • Ahmed, M., Sultan, M., Yan, E., Wahr, J., 2016, Assessing and Improving Land Surface Model Outputs Over Africa Using GRACE, Field, and Remote Sensing Data. Surveys in Geophysics, v. 37, p. 529–556, doi: 10.1007/s10712-016-9360-8.

Mapping subsurface geology using geophysical techniques 

We use geophysical techniques (e.g., GPR, seismic, relativity, gravity, magnetic, electromagnetic) to map and characterize the subsurface geology and structures in order to understand the role or different structural elements on fluid (oil, gas, groundwater, contaminants) accumulation and flow.

Publications:
  • Essam, D., Ahmed, M., Abouelmagd A., Soliman, F., 2019, Monitoring temporal variations in groundwater levels in urban areas using Ground Penetrating Radar, Science of the Total Environment, In Review.
  • Turner, R., Ahmed, M., 2019, Structural and stratigraphic controls on reservoir quality and distribution of the Oligocene Vicksburg formation, Brooks county, Texas: AGU, San Francisco, CA, Dec. 2019.
  • Colmenero, D., Ahmed, M., Zavala, L., 2019, Subsurface characterization of Padre Island using Ground Penetrating Radar (GPR) and Electrical Resistivity Imaging (ERI): Society of Exploration Geophysicists (SEG), San Antonito, TX, Sep. 2019.
Forecasting GRACE data

We use artificial inelegance techniques (artificial neural network) to forecast GRACE data using the radially available climatic and remote sensing datasets (e.g., rainfall, evapotranspiration, and temperature).  

Publications:

  • Ahmed, M., Sultan, M., Elbayoumi, T., Tissot, P., 2019, Forecasting GRACE data over the African watersheds using artificial neural network, Remote Sensing,v. 11, p. 1769-1790, doi: https://doi.org/10.3390/rs11151769.