University of California, Riverside

Environmental Sciences

Daniel Hirmas

Daniel HirmasDaniel Hirmas Photograph

Associate Professor of Pedology

Academic Degrees:

  • Ph.D., Soil and Water Sciences, University of California, Riverside, 2008
  • M.S., Soil Science, Texas Tech University, 2003
  • B.A., Biology, Texas A&M University, 1999


  • Quantitative pedology
  • Soil-landscape dynamics
  • Soil hydrology
  • Dust transport and deposition

Research Group

    Highly motivated students are encouraged to contact Daniel Hirmas via email for information on Ph.D. graduate positions in pedology.

    Current Research

    • Analysis of continental-scale datasets to assess rapid, climate-induced changes in soil structure, macroporosity, and soil hydrology
    • Application of 3-D laser scanning, proximal sensing, and rapid fabrication methods to quantitatively characterize and understand the evolution of soil structure and its effect over vadose zone water flux
    • Effects of land-surface properties on the transport and deposition of dust in arid soils
    • Soil-landscape-climate effects on the distribution of pedogenic carbonate

    Selected Publications:

    • Hirmas, D.R., D. Giménez, A. Nemes, R. Kerry, N.A. Brunsell, and C.J. Wilson. 2018. Climate-induced changes in continental-scale soil macroporosity may intensify water cycle. Nature 561:100-103. doi:
    • Ziyaee, A., A. Karimi, D.R. Hirmas, M. Kehl, A. Lakzian, H. Khademi, and D.B. Mechem. 2018. Spatial and temporal variations of airborne dust fallout in Khorasan Razavi Province, Northeastern Iran. Geoderma 326:42-55. doi:
    • Billings, S., D.R. Hirmas, P.L. Sullivan, C. Lehmeier, S. Bagchi, K. Min, Z. Brecheisen, E. Hauser, R. Stair, R. Flournoy, and D.deB. Richter. 2018. Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration. Elementa: Science of the Anthropocene 6:34. doi:
    • Hirmas, D.R., and R.D. Mandel. 2017. Soils of the Great Plains. p. 131-164. In L. West et al. (eds.) Soils of the USA, Springer, Dordrecht, Netherlands.
    • Mohammed, A.K., D.R. Hirmas, D. Giménez, R.D. Mandel, and J.R. Miller. 2016. A digital morphometric approach for quantifying ped shape. Soil Science Society of America Journal 80:1604-1618. doi: 10.2136/sssaj2016.06.0203
    • Hirmas, D.R., D. Giménez, E.A. Mome Filho, M. Patterson, K. Drager, B.F. Platt, and D.V. Eck. 2016. Quantifying soil structure and porosity using three-dimensional laser scanning. p. 19-35. In A. Hartemink and B. Minasny (eds.) Digital Soil Morphometrics, Springer, Dordrecht, Netherlands.
    • Kim, D., D.R. Hirmas, R.W. McEwan, T.G. Mueller, S.J. Park, P. Šamonil, J.A. Thompson, and O. Wendroth. 2016. Predicting the influence of multi-scale spatial autocorrelation on soil-landform modeling. Soil Science Society of America Journal 80:409-419. doi: 10.2136/sssaj2015.10.0370
    • Eck, D.V., M. Qin, D.R. Hirmas, D. Giménez, and N.A. Brunsell. 2016. Relating quantitative soil structure metrics to saturated hydraulic conductivity. Vadose Zone Journal 15(1). doi: 10.2136/vzj2015.05.0083

    Courses Taught:

    • TBD

    Graduate Program Affiliations and Research Focus Areas:

    • Research Focus Areas
      • Soil and Water Sciences
    • Programs
      • Environmental Sciences

    More Information

    General Campus Information

    University of California, Riverside
    900 University Ave.
    Riverside, CA 92521
    Tel: (951) 827-1012

    Department Information

    Environmental Sciences
    Geology 2460

    Tel: (951) 827-5116
    Fax: (951) 827-4652