Ciaran Harman

Assistant Professor; Russell Croft Faculty Scholar

Research Interests

landscape hydrology and transport

  • Ph.D. 2011, University of Illinois
  • M.S. 2007, University of Illinois
  • B.A. 2003, University of Western Australia
  • Other Bachelor's Degree (B.Eng.) 2003, University of Western Australia
Research Areas
  • Understanding flow and transport across hydrologic scales, and their link to the co-evolution of landscape structure, using a combination of theory, experiments, modeling, field work and data analysis.
  • 2011:  Ross J. Martin Award
  • 2010:  Horton (Hydrology) Research Grant
  • 2010:  Mavis Future Faculty Fellowship
  • 2008:  Excellence in Teaching
  • 2006:  Beatty Fellowship
  • 2005:  Beatty Fellowship
  • 2002:  Undergraduate Groundwater Prize
Journal Articles
  • Rinaldo, A., Benettin, P., Harman, C., Hrachowitz, M., McGuire, K. J., van der Velde, Y., Bertuzzo, E., Botter, G. (2015).  Storage selection functions: A coherent framework for quantifying how catchments store and release water and solutes.  Water Resources Research.  51(6).  4840–4847.
  • Harman, C. (2015).  Time-variable transit time distributions and transport: Theory and application to storage-dependent transport of chloride in a watershed.  Water Resources Research.  51(1).  1–30.
  • St Clair, J., Moon, S., Holbrook, W. S., Perron, J. T., Riebe, C. S., Martel, S. J., Carr, B., Harman, C., Singha, K., Richter, D. D. (2015).  Geophysical imaging reveals topographic stress control of bedrock weathering.  Science (New York, N.Y.).  350(6260).  534–538.
  • Li, H., Sivapalan, M., Tian, F., Harman, C. (2014).  Functional approach to exploring climatic and landscape controls of runoff generation: 1. Behavioral constraints on runoff volume.  Water Resources Research.  50(12).  9300–9322.
  • Harman, C., Kim, M. (2014).  An efficient tracer test for time-variable transit time distributions in periodic hydrodynamic systems.  Geophysical Research Letters.  41(5).  1567–1575.
  • Ehret, U., Gupta, H. V., Sivapalan, M., Weijs, S. V., Schymanski, S. J., Bloschl, G., Gelfan, A N., Harman, C., Kleidon, A., Bogaard, T. A., Wang, D., Wagener, T., Scherer, U., Zehe, E., Bierkens, M. F., Di Baldassarre, G., Parajka, J., van Beek, L P H., van Griensven, A., Westhoff, M. C., Winsemius, H. C. (2014).  Advancing catchment hydrology to deal with predictions under change.  Hydrology and Earth System Sciences.  18(2).  649–671.
  • Harman, C., Lohse, K. A., Troch, P. A., Sivapalan, M. (2014).  Spatial patterns of vegetation, soils, and microtopography from terrestrial laser scanning on two semiarid hillslopes of contrasting lithology.  Journal of Geophysical Research - Biogeosciences.  119(2).  163–180.
  • Harman, C., Troch, P. A. (2014).  What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes.  Hydrology and Earth System Sciences.  18(2).  417–433.
  • Thompson, S. E., Sivapalan, M., Harman, C., Srinivasan, V., Hipsey, M. R., Reed, P., Montanari, A., Bloschl, G. (2013).  Developing predictive insight into changing water systems: use-inspired hydrologic science for the Anthropocene.  Hydrology and Earth System Sciences.  17(12).  5013–5039.
  • Thompson, S. E., Sivapalan, M., Harman, C., Srinivasan, V., Hipsey, M. R., Reed, P., Montanari, A., Bloschl, G. (2013).  Developing predictive insight into changing water systems: use-inspired hydrologic science for the Anthropocene..  Hydrology and Earth System Sciences.  17(12).
  • Montanari, A., Young, G., Savenije, H. H., Hughes, D., Wagener, T., Ren, L. L., Koutsoyiannis, D., Cudennec, C., Toth, E., Grimaldi, S., Bloschl, G., Sivapalan, M., Beven, K., Gupta, H., Hipsey, M., Schaefli, B., Arheimer, B., Boegh, E., Schymanski, S. J., Di Baldassarre, G., Yu, B., Hubert, P., Huang, Y., Schumann, A., Post, D. A., Srinivasan, V., Harman, C., Thompson, S., Rogger, M., Viglione, A., McMillan, H., Characklis, G., Pang, Z., Belyaev, V. (2013).  “Panta Rhei—Everything Flows”: Change in hydrology and society—The IAHS Scientific Decade 2013–2022.  Hydrological Sciences Journal.  58(6).  1256–1275.
  • Troch, P. A., Berne, A., Bogaart, P., Harman, C., Hilberts, A. G., Lyon, S. W., Paniconi, C., Pauwels, V. R., Rupp, D. E., Selker, J. S., Teuling, A. J., Uijlenhoet, R., Verhoest, N. E. (2013).  The importance of hydraulic groundwater theory in catchment hydrology: The legacy of Wilfried Brutsaert and Jean-Yves Parlange.  Water Resources Research.  49.  5099–5116.
  • Pelletier, J. D., Barron-gafford, G. A., Breshears, D. D., Brooks, P. D., Chorover, J., Durcik, M., Harman, C., Huxman, T. E., Lohse, K. A., Lybrand, R., Meixner, T., McIntosh, J. C., Papuga, S. A., Rasmussen, C., Schaap, M., Swetnam, T. L., Troch, P. A. (2013).  Coevolution of nonlinear trends in vegetation , soils , and topography with elevation and slope aspect : A case study in the sky islands of southern Arizona.  Journal of Geophysical Research-Earth Surface.  118(2).  741–758.
  • Gall, H. E., Park, J., Harman, C., Jawitz, J. W., Rao, P. (2012).  Landscape filtering of hydrologic and biogeochemical responses in managed catchments.  Landscape Ecology.
  • Patil, S., Sivapalan, M., Hassan, M. A., Ye, S., Harman, C., Xu, X. (2012).  A network model for prediction and diagnosis of sediment dynamics at the watershed scale.  Journal of Geophysical Research.  117.  F00A04.
  • Zanardo, S., Harman, C., Troch, P. A., Rao, P. S., Sivapalan, M. (2012).  Intra-annual rainfall variability control on interannual variability of catchment water balance: A stochastic analysis.  Water Resources Research.  48.  W00J16.
  • Carrillo, G., Troch, P. A., Sivapalan, M., Wagener, T., Harman, C., Sawicz, K. (2011).  Catchment classification: Hydrological analysis of catchment behavior through process-based modeling along a climate gradient.  Hydrology and Earth System Sciences.  15(11).  3411–3430.
  • Harman, C., Rao, P. S., Basu, N. B., McGrath, G. S., Kumar, P., Sivapalan, M. (2011).  Climate, soil and vegetation controls on the temporal variability of vadose zone transport.  Water Resources Research.  47.  W00J13.
  • Sivapalan, M., Yaeger, M. A., Harman, C., Xu, X., Troch, P. A. (2011).  Functional model of water balance variability at the catchment scale : 1 . Evidence of hydrologic similarity and space-time symmetry.  Water Resources Research.  47(2).  W02522.
  • Harman, C., Troch, P. A., Sivapalan, M. (2011).  Functional model of water balance variability at the catchment scale: 2. Elasticity of fast and slow runoff components to precipitation change in the continental United States.  Water Resources Research.  47(2).  W02523.
  • Schaefli, B., Harman, C., Sivapalan, M., Schymanski, S. J. (2011).  HESS Opinions: Hydrologic predictions in a changing environment: behavioral modeling.  Hydrology and Earth System Sciences.  15(2).  635–646.
  • Thompson, S. E., Harman, C., Schumer, R., Wilson, J. S., Basu, N. B., Brooks, P. D., Donner, S. D., Hassan, M. A., Packman, A I., Rao, P. (2011).  Patterns, puzzles and people: implementing hydrologic synthesis.  Hydrological Processes.  25(20).  3256–3266.
  • Thompson, S. E., Harman, C., Troch, P. A., D, P., Sivapalan, M. (2011).  Spatial scale dependence of ecohydrologically mediated water balance partitioning: A synthesis framework for catchment ecohydrology.  Water Resources Research.  47.  W00J03.
  • Sivapalan, M., Thompson, S. E., Harman, C., Basu, N. B., Kumar, P. (2011).  Water cycle dynamics in a changing environment: Improving predictability through synthesis.  Water Resources Research.  47(10).  W00J01.
  • Thompson, S. E., Harman, C., Konings, A G., Sivapalan, M., Neal, A., Troch, P. A. (2011).  Comparative hydrology across AmeriFlux sites: The variable roles of climate, vegetation, and groundwater.  Water Resources Research.  47(10).  W00J07.
  • Guan, K., Thompson, S. E., Harman, C., Basu, N. B., Rao, P. S., Sivapalan, M., Packman, A I., Kalita, P. K. (2011).  Spatiotemporal scaling of hydrological and agrochemical export dynamics in a tile-drained Midwestern watershed.  Water Resources Research.  47(5).  W00J02.
  • Wagener, T., Sivapalan, M., Troch, P. A., McGlynn, B. L., Harman, C., Gupta, H. V., Kumar, P., Rao, P. S., Basu, N. B., Wilson, J. S. (2010).  The future of hydrology: An evolving science for a changing world.  Water Resources Research.  46.  W05301.
  • Thompson, S. E., Harman, C., Heine, P., Katul, G. G. (2010).  Vegetation-infiltration relationships across climatic and soil type gradients.  Journal of Geophysical Research.  115(G2).  1–12.
  • Harman, C., Reeves, D. M., Baeumer, B., Sivapalan, M. (2010).  A subordinated kinematic wave equation for heavy-tailed flow responses from heterogeneous hillslopes.  J Geophys Res.  115.  F00A08.
  • Harman, C., Sivapalan, M., Kumar, P. (2009).  Reply to comment by J. Szilagyi on “Power law catchment-scale recessions arising from heterogeneous linear small-scale dynamics”.  Water Resources Research.  45(12).  n/a–n/a.
  • Hopp, L., Harman, C., Desilets, S. L., Graham, C. B., McDonnell, J. J., Troch, P. A. (2009).  Hillslope hydrology under glass : confronting fundamental questions of soil-water-biota co-evolution at Biosphere 2.  Hydrology and Earth System Sciences.  13(11).  4411–4448.
  • Harman, C., Sivapalan, M., Kumar, P. (2009).  Power law catchment-scale recessions arising from heterogeneous linear small-scale dynamics.  Water Resources Research.  45.  W09404.
  • Troch, P. A., Martinez, G. F., Pauwels, V. R., Durcik, M., Sivapalan, M., Harman, C., Brooks, P. D., Gupta, H., Huxman, T. (2009).  Climate and vegetation water use efficiency at catchment scales.  Hydrological Processes.  2414.  2409–2414.
  • Harman, C., Sivapalan, M. (2009).  A similarity framework to assess controls on shallow subsurface flow dynamics in hillslopes.  Water Resources Research.  45(1).  W01417.
  • Harman, C., Sivapalan, M. (2009).  Effects of hydraulic conductivity variability on hillslope-scale shallow subsurface flow response and storage-discharge relations.  Water Resources Research.  45.  W01421.
  • De Rose, R. C., Stewardson, M. J., Harman, C. (2008).  Downstream hydraulic geometry of rivers in Victoria, Australia.  Geomorphology.  99(1).  302–316.
  • Harman, C., Stewardson, M., DeRose, R. (2008).  Variability and uncertainty in reach bankfull hydraulic geometry.  Journal of Hydrology.  351(1).  13–25.
  • Harman, C., Stewardson, M. (2005).  Optimizing dam release rules to meet environmental flow targets.  River Research and Applications.  21(2-3).  113–129.
  • DeRose, R., Harman, C. (2005).  Regional models of stream channel metrics.  CRC for Catchment ….
Other Publications
  • Harman, C. (2011).  Landscape structure, regimes, and the co-evolution of hydrologic systems.  Department of Civil Engineering, University of Illinois at Urbana-Champaign.
  • "Assessing the Potential Toxicity Hazard to Aquatic Life from Immersion of Insecticide-Treated Mosquito Nets During Fishing and Washing", Annual Meeting American Society for Tropical Medicine and Hygiene.  Atlanta, GA.  November 16, 2016
  • "Getting the tail to wag the dog: Incorporating groundwater transport into catchment solute transport models using rank StorAge Selection (rSAS) functions", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "Hyporheic transport in headwater mountain streams is time-invariant in locations where geologic controls dominate hydrologic forcing", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "Implications of an "Inverse Storage Effect" on the Sensitivity of Watershed Transit Times to Rainfall Variability at Plynlimon, Wales", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "Internal versus external controls on age variability: Definitions, origins and implications in a changing climate", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "Relative controls of external and internal variability on time-variable transit time distributions, and the importance of StorAge Selection function approaches", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "The Relative Importance of Time-Variable Transport through Hillslope and Riparian Hydrogeomorphic Units on the Emergent TTD of a Small Forested Piedmont Watershed", American Geophysical Union Fall Meeting.  San Francisco, CA.  2015
  • "rSAS: The new theory of water age, and what it can teach us about how catchments function", Department of Geology Seminar.  Kent, Ohio.  2015
  • "rank StorAge Selection (rSAS) functions: A unified framework for modeling solute transport at the catchment scale", International conference on hydro-biogeochemical processes: mechanisms, coupling and impact.  Wuhan, China.  October 30, 2015
  • "Upscaled solute transport theory as a frontier of understanding: Are StorAge Selection functions merely curve fitting?", Department of Hydrogeology Seminar.  Leipzig, Germany.  2015
  • "Upscaled solute transport theory as a frontier of understanding: Are StorAge Selection functions merely curve fitting?", Workshop on ``Terrestrial systems: Frontiers of our understanding''.  Freudenstadt, Germany.  2015
  • "Observation and physical interpretation of the rank storage selection (rSAS) function of a weighing lysimeter", Gordon Conference on Catchment Science: Interactions of Hydrology, Biology & Geochemistry.  Andover, NH.  2015
  • "StorAge Selection functions as a bridge between groundwater transport and integrated watershed models", Workshop on Integrated Environmental Modeling of Estuarine Systems.  Davis, CA.  2015
  • "Solute transport in a non-stationary world: New theory for hydrologic transit times in transient flows", Department of Physics, Astronomy & Geosciences Seminar.  Towson, MD.  2015
  • "Modeling unsteady lumped transport with time-varying transit time distributions", National Water Quality Assessment, Integrated Watershed Studies Team Meeting.  USGS National Center, Reston, VA.  2015
  • "Transit time distributions in a changing world:New theory for hydrologic transport under non-stationarity", North East Geological Sciences Society of America Regional Meeting.  Bretton Woods.  2015
  • "Combining multiscale observations and new transport theory to explore time variability in hydrologic transport processes operating in nested Piedmont watersheds", Northeastern Section Meeting.  Bretton Woods, NH.  2015
  • "Modeling the linkages between transit time distributions, nitrate transport, and climate variability: opportunities and challenges in the Chesapeake Bay watershed", Northeastern Section Meeting.  Bretton Woods, NH.  2015
  • "Transit Time Distributions in a Changing World: New Theory for Understanding and Modeling Hydrologic Transport Under Non-Stationarity", St Anthony Falls Laboratory Seminar.  Minneapolis, Minnesota.  2015
  • "Transit time distributions in a changing world: New theory for hydrologic transport under non-stationarity", National Research Program Seminar.  Reston, VA.  2015
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Chesapeake Bay Program Office, Modeling Workgroup.  Annapolis, MD.  2015
  • "An experimental application of the Periodic Tracer Hierarchy (PERTH) method to quantify time-variable water and solute transport in a sloping soil lysimeter", Fall Meeting.  San Francisco, CA.  2014
  • "Combining New Theory and Multi-Scale Observations to Explore Hydrologic Transport Processes and Their Relationship to Catchment Structure in a Small Piedmont Watershed", Fall Meeting.  San Francisco, CA.  2014
  • "Distinguishing sources of variability in catchment transit time distributions: climate, water balance partitioning, and flow-path dynamics", Fall Meeting.  San Francisco, CA.  2014
  • "Evaluation of Methods for Estimating Long-Range Dependence in Water Quality Time Series with Missing Data and Irregular Sampling", Fall Meeting.  San Francisco, CA.  2014
  • "Modeling hyporheic exchange and in-stream transport with time-varying transit time distributions", Fall Meeting.  San Francisco, CA.  2014
  • "Modeling of Time-Varying Stream Water Age Distributions: Preliminary Investigations with Non-Conservative Solutes", Fall Meeting.  San Francisco, CA.  2014
  • "Recent advances towards a theory of catchment hydrologic transport: age-ranked storage and the rSAS-functions", Fall Meeting.  San Francisco, CA.  2014
  • "Using New Theory and Experimental Methods to Understand the Relative Controls of Storage, Antecedent Conditions and Precipitation Intensity on Transit Time Distributions through a Sloping Soil Lysimeter", Fall Meeting.  San Francisco, CA.  2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Department of Geological Sciences Seminar.  Newark, DE.  2014
  • "Recent advances in transport modeling using transit time distributions", Annual Public Meeting.  U.S. Army Corps of Engineers, Baltimore, MD.  October 21, 2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Department of Infrastructure Engineering Seminar.  Melbourne, Australia.  2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", School of Earth and Environment Seminar.  Perth, Australia.  2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Environmental Engineering and Chemistry seminar.  Baltimore, MD.  March 6, 2014
  • "Beyond perfect mixing: A new theoretical framework for modeling unsteady transport through control volumes, and applications to long-term and high-frequency solute transport dynamics in catchments", Center for Urban Environmental Research and Education seminar.  Catonsville, MD.  February 21, 2014
  • "Well if it isn't 'well-mixed', what is it?: A new theoretical framework for modeling unsteady transport through control volumes, and applications to long-term and high-frequency solute transport dynamics in catchments", Department of Earth and Planetary Science Bromery lecture.  Baltimore, MD.  February 20, 2014
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