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Research Interests

Surface water-groundwater interactions

Stochastic hydrogeology

Subsurface flow and mass transport modeling

Upscaling flow and transport in porous media

Nitrogen cycling

Freshwater resources of atoll island nations

Peer-Reviewed Publications

  1. Ershadnia, R., Wallace, C. D., Hosseini, S. A., Dai, Z., & Soltanian, M. R. (2021). Capillary Heterogeneity Linked to Methane Lateral Migration in Shallow Unconfined Aquifers. Geophysical Research Letters, 48(23), e2021GL095685.

  2. Wallace, C. D., Tonina, D., McGarr, J. T., de Barros, F. P., & Soltanian, M. R. (2021). Spatiotemporal dynamics of nitrous oxide emission hotspots in heterogeneous riparian sediments. Water Resources Research, e2021WR030496.

  3. Zhang, X., Ma, F., Yin, S., Wallace, C. D., Soltanian, M. R., Dai, Z., ... & Lü, X. (2021). Application of upscaling methods for fluid flow and mass transport in multi-scale heterogeneous media: A critical review. Applied Energy, 303, 117603.

  4. Ershadnia, R., Wallace, C. D., Hajirezaie, S., Hosseini, S. A., Nguyen, T. N., Sturmer, D. M., ... & Soltanian, M. R. (2021). Hydro-thermo-chemo-mechanical modeling of carbon dioxide injection in fluvial heterogeneous aquifers. Chemical Engineering Journal, 133451.

  5. Behzadi, F., Wallace, C. D., Ward, D., Zhou, H., Versteeg, R., & Soltanian, M. R. (2021). Bed form-induced hyporheic exchange and geochemical hotspots. Advances in Water Resources, 156, 104025.

  6. McGarr, J. T., Wallace, C. D., Ntarlagiannis, D., Sturmer, D. M., & Soltanian, M. R. (2021). Geophysical mapping of hyporheic processes controlled by sedimentary architecture within compound bar deposits. Hydrological Processes, 35(9), e14358.

  7. Ma, Z., Dai, Z., Zhang, X., Zhan, C., Gong, H., Zhu, L., Wallace, C.D., Soltanian, M.R. (2021), Dispersivity variations of solute transport in heterogeneous sediments: experimental and modeling investigations, Stoch. Environ. Res. Risk Assess.

  8. Ershadnia, R., Gershenzon, N.I., Amooie, M.A., Wallace, C.D., Hajirezaie, S., Hosseini, S.A., Sturmer, D.A., Ritzi, R.W., Soltanian, M.R. (2021), CO2 geological sequestration in multiscale heterogeneous aquifers: Effect of heterogeneity, connectivity, impurity, and hysteresis, Adv. Water Resour., DOI: 10.1016/j.advwatres.2021.103895

  9. Wallace, C.D., Soltanian, M.R. (2021), Surface water-groundwater exchange dynamics in buried-valley aquifer systems, Hydrol. Process., DOI: 10.1002/HYP.14066

  10. Wallace, C.D., Soltanian, M.R. (2021), Underlying riparian lithology controls redox dynamics during stage-driven mixing, J. Hydrol., DOI: 10.1016/j.jhydrol.2021.126035

  11. Ma, Z., Dong, S., Yin, S., Dai, Z., Zhu, L., Jia, W., Wallace, C.D., Soltanian, M.R. (2021), Experimental investigations on scale-dependent dispersivity in three-dimensional heterogeneous porous media, Environ. Sci. Pollut. Res., DOI: 10.1007/s11356-020-12316-4

  12. Ershadnia, R., Wallace, C.D., Soltanian, M.R. (2020), CO2 geological sequestration in heterogeneous binary media: effects of geological and operational conditions, Adv. Geo-Energy Res., DOI: 10.46690/ager.2020.04.05

  13. Ma, Z., Dai, Z., Zhang, X., Zhan, C., Gong, H., Zhu, L., Wallace, C.D., Soltanian, M.R. (2020), Solute transport in heterogeneous sediments: experimental and theoretical investigations, Authorea, DOI: 10.22541/au.159415494.43521976

  14. Liu, Y., Wallace, C.D., Zhou, Y., Ershadnia, R., Dwivedi, D., Xue, L., Behzadi, F., Soltanian, M.R (2020), Influence of streambed heterogeneity on hyporheic flow and sorptive solute transport in gravelly rivers, Water, DOI: 10.3390/w12061547

  15. Wallace, C.D., Sawyer, A.H., Soltanian, M.R., Barnes, R.T. (2020), Nitrate removal within heterogeneous riparian aquifers under tidal influence, Geophys. Res. Lett., DOI: 10.1029/2019GL085699

  16. Wallace, C.D., Sawyer, A.H., Barnes, R.T., Soltanian, M.R., Gabor, R.S., Wilkins, M.J., & Moore, M.T. (2020), A model analysis of the tidal engine that drives nitrogen cycling in coastal riparian aquifers. Water Resour. Res. 56(4), DOI: 10.1029/2019WR025662

  17. Barnes, R.T., Sawyer, A.H., Tight, D.M., Wallace, C.D., Hastings, M.G. (2019), Hydrogeologic controls of surface water – groundwater nitrogen dynamics within a tidal freshwater zone. J. Geophys. Res. Biogeosci. 124(11), 1-35, DOI: 10.1029/2019JG005164

  18. Wallace, C.D., Sawyer, A.H., Barnes, R.T. (2018), Spectral analysis of continuous redox data reveals geochemical dynamics near the stream-aquifer interface, Hydrol. Process. 33(3), 405-413, DOI: 10.1002/hyp.13335

  19. Knights, D., Parks, K.C., Sawyer, A.H., David, C.H., Browning, T.N., Danner, K.M., Wallace, C.D. (2017), Direct groundwater discharge and vulnerability to hidden nutrient loads along the great lakes coast of the United States, J. Hydrol. 554, 331-341, DOI: 10.1016/j.jhydrol.2017.09.001

  20. Wallace, C.D., Bailey, R.T. (2017), Geohydrologic factors governing atoll island groundwater resources, J. Hydrol. Eng. 22(6), 1-12, DOI: 10.1061/(ASCE)HE.1943-5584.0001499

  21. Bailey, R.T., Barnes, K., Wallace, C.D. (2016), Predicting future groundwater resources of coral atoll islands, Hydrol. Process. 30, 2092-2105, DOI: 10.1002/hyp.10781

  22. Wallace, C.D., Bailey, R.T., Arabi, M. (2015), Rainwater catchment system design using simulated climate data. J. Hydrol. 529, 1798-1809, DOI: 10.1016/j.jhydrol.2015.08.006

  23. Wallace, C.D., Bailey, R.T. (2014), Sustainable rainwater catchment systems for Micronesian atoll communities. J. Am. Water Resour. As. 22(6), 1-12, DOI: 10.1111/jawr.12244

Conference Proceedings

**invited talk

  1. Soltanian, M. R. & Wallace, C. D. (2021), Spatiotemporal dynamics of solute mixing and redox dynamics in riparian floodplains. abstract, in Proceedings of the 2019 American Geophysical Union Conference, 13-17 December, 2021, New Orleans, LA.

  2. **Wallace, C.D., Sawyer, A.H., Soltanian, M.R., Barnes, R.T. (2019), Nitrate removal within heterogeneous fluvial sediments under tidal influence. abstract, in Proceedings of the 2019 American Geophysical Union Conference, 9-13 December, 2019, San Francisco, CA.

  3. Wallace, C.D., Sawyer, A.H., Soltanian, M.R., Barnes, R.T. (2019), Nitrate removal within heterogeneous fluvial sediments under tidal influence. abstract, in Proceedings of the 2019 Geologic Society of America Conference, 22-25 September, 2019, Phoenix, AZ.

  4. Barnes, R.T., Sawyer, A.H., Tight, D.M., and Wallace, C.D. (2018), Hydrogeologic controls of nitrogen dynamics along flow paths within a tidal freshwater zone, abstract, in Proceedings of the 2018 American Geophysical Union Conference, 10-14 December, 2018, Washington, D.C.

  5. Barnes, R.T., Tight, D.M., Sawyer, A.H., and Wallace, C.D. (2018), Hydrogeologic controls on nitrogen dynamics within the tidal freshwater zone, abstract, in Proceedings of the 2018 Goldschmidt Conference, 12-17 August, 2018, Boston, MA.

  6. Wallace, C.D., Sawyer, A.H., and Barnes, R.T. (2018), Spectral analysis of continuous redox data reveals geochemical dynamics near the stream-aquifer interface, abstract, in Proceedings of the 2018 Goldschmidt Conference, 12-17 August, 2018, Boston, MA.

  7. Sawyer, A.H., Barnes, R.T., Wallace, C.D., Knights, D.H., Tight, D., and Bayer, M. (2017), Dynamic surface water-groundwater exchange and nitrogen transport in the riparian aquifer of a tidal river, abstract, in Proceedings of the 2017 American Geophysical Union Conference, 11-15 December, 2017, New Orleans, LA.

  8. Barnes, R.T., Sawyer, A.H., Wallace, C.D., and Knights, D.H. (2017), A Tale of Two Competing Hot Spots: Nitrogen Cycling in the Tidal Freshwater Zone, abstract, in Proceedings of the 2017 Gordon Research Conference: Interactions of Hydrology, Biology & Geochemistry, June 2017.

  9. Barnes, R.T., Sawyer, A.H., Wallace, C.D., and Knights, D.H. (2016), Nitrogen biogeochemistry in the stream and transient storage zones of a freshwater tidal ecosystem, Delaware, USA, abstract, in Proceedings of the 2016 American Geophysical Union Conference, 12-16 December, 2016, San Francisco, CA.

  10. Wallace, C.D., Sawyer, A.H., Barnes, R.T., and Bayer, M. (2016), Measuring and Modeling Denitrification in a Tidal River, abstract, in Proceedings of the 2016 Geologic Society of America Conference, 25-28 September, 2016, Denver, CO.

  11. Sawyer, A.H., Knights, D.H., Barnes, R.T., Wallace, C.D., Bray, S.N., and Musial, C. (2015), A tale of two interfaces: Dynamic nitrate removal in the hyporheic zone of a tidal fresh river, abstract, in Proceedings of the 2015 American Geophysical Union Conference, 14-18 December, 2015, San Francisco, CA.

  12. Barnes, R.T., Bray, S.N., Sawyer, A.H., and Wallace, C.D. (2015), Nitrogen removal and production within transient storage zones in a freshwater tidal environment, Delaware, USA, abstract, in Proceedings of the 2015 American Geophysical Union Conference, 14-18 December, 2015, San Francisco, CA.

  13. Wallace, C.D. and Bailey, R.T. (2015), Estimation of Future Freshwater Supply of Micronesian Atoll Islands Using Simulated Climate Data, abstract, in Proceedings of the XXXV American Geophysical Union Hydrology Days, Fort Collins, CO.

  14. Wallace, C.D. and Bailey, R.T. (2014), Estimation of Future Freshwater Lens Volume of Micronesian Atoll Islands Using Simulated Climate Data, abstract, in Proceedings of the 2014 AWRA Annual Water Resources Conference, 3-6 November, 2014, Tysons Corner, VA.

  15. Wallace, C.D. and Bailey, R.T. (2014), Rainwater Catchment Analysis to Assess Existing and Potential Water Supply for Micronesian Atoll Islands, abstract, in Proceedings of the XXXIV American Geophysical Union Hydrology Days, Fort Collins, CO.

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