Faculty

Ciaran Harman

Assistant Professor; Russell Croft Faculty Scholar

Research Interests

landscape hydrology and transport

Education
  • Ph.D. 2011, Univ Illinois Urbana
Experience
  • 2015 - Present:  Consultant, Chesapeake Bay Program
  • 2014 - Present:  Assistant Professor, A&S Earth and Planetary Sciences
Research Areas
  • Co-evolution of landscape structure
  • DATA analysis
  • EXPERIMENTS
  • Field work
  • Flow across hydrologic scales
  • Modeling
  • THEORY
  • Transport across hydrologic scales
Awards
  • 2017:  CAREER Award
  • 2017:  Russell Croft Faculty Scholar
  • 2016:  Early Career Award (Hydrology section)
  • 2015:  Editors’ Citation for Excellence in Refereeing for Geophysical Research Letters
  • 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
  • Zhang Q, Harman CJ, Kirchner JW (2018).  Evaluation of statistical methods for quantifying fractal scaling in water-quality time series with irregular sampling.  Hydrology and Earth System Sciences.  22(2).
  • Gall HE, Schultz D, Veith TL, Goslee SC, Mejia A, Harman CJ, Raj C, Patterson PH (2018).  The effects of disproportional load contributions on quantifying vegetated filter strip sediment trapping efficiencies.  Stochastic Environmental Research and Risk Assessment.
  • Zhang Q, Harman CJ, Kirchner J (2018).  Evaluation of statistical methods for quantifying fractal scaling in water-quality time series with irregular sampling.  Hydrology and Earth System Sciences.  22.  --1192.
  • Wilusz DC, Harman CJ, Ball WP (2017).  Sensitivity of Catchment Transit Times to Rainfall Variability Under Present and Future Climates.  Water Resources Research.  53(12).
  • Wilusz DC, Harman CJ, Ball WP (2017).  Sensitivity of Catchment Transit Times to Rainfall Variability Under Present and Future Climates.  Water Resources Research.  53.  10231--10256.
  • Harman CJ, Cosans CL, Putnam SM (2017).  Comment on "A Simple Model for Regolith Formation by Chemical Weathering" by Braun et al.: Contradictory Concentrations and a Tale of Two Velocities.  Journal of Geophysical Research-Earth Surface.  122.  2033--2036.
  • Pangle LA, Kim M, Cardoso C, Lora M, Meira Neto AA, Volkmann THM, Wang Y, Troch PA, Harman CJ (2017).  The mechanistic basis for storage-dependent age distributions of water discharged from an experimental hillslope.  Water Resources Research.  (4).
  • Zhang Q, Harman CJ, Ball WP (2016).  An improved method for interpretation of riverine concentration-discharge relationships indicates long-term shifts in reservoir sediment trapping.  Geophysical Research Letters.  43(19).
  • Kim M, Pangle LA, Cardoso C, Lora M, Volkmann THM, Wang Y, Harman CJ, Troch PA (2016).  Transit time distributions and StorAge Selection functions in a sloping soil lysimeter with time-varying flow paths: Direct observation of internal and external transport variability.  Water Resources Research.  52(9).
  • Harman CJ, Ward AS, Ball A (2016).  How does reach-scale stream-hyporheic transport vary with discharge? Insights from rSAS analysis of sequential tracer injections in a headwater mountain stream.  Water Resources Research.  52(9).
  • Ward AS, Schmadel NM, Wondzell SM, Harman C, Gooseff MN, Singha K (2016).  Hydrogeomorphic controls on hyporheic and riparian transport in two headwater mountain streams during base flow recession.  Water Resources Research.  52(2).
  • Ward AS, Schmadel NM, Wondzell SM, Harman C, Gooseff MN, Singha K (2016).  Hydrogeomorphic controls on hyporheic and riparian transport in two headwater mountain streams during base flow recession.  Water Resources Research.  (2).
  • Rinaldo A, Benettin P, Harman CJ, Hrachowitz M, McGuire KJ, van der Velde Y, Bertuzzo E, Botter G (2016).  Reply to comment by Porporato and Calabrese on "Storage selection functions: A coherent framework for quantifying how catchments store and release water and solutes".  Water Resources Research.  52.  616--618.
  • Clair JS, Moon S, Holbrook WS, Perron JT, Riebe CS, Martel SJ, Carr B, Harman C, Singha K, De Richter DB (2015).  Geophysical imaging reveals topographic stress control of bedrock weathering.  Science.  350(6260).
  • Rinaldo A, Benettin P, Harman CJ, Hrachowitz M, McGuire KJ, 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).
  • Harman CJ (2015).  Time-variable transit time distributions and transport: Theory and application to storage-dependent transport of chloride in a watershed.  Water Resources Research.
  • Harman CJ (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).
  • Harman CJ (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).
  • Li HY, 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).
  • Li HY, 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).
  • Harman CJ, Kim M (2014).  An efficient tracer test for time-variable transit time distributions in periodic hydrodynamic systems.  Geophysical Research Letters.  41(5).
  • Ehret U, Gupta HV, Sivapalan M, Weijs SV, Schymanski SJ, Blöschl G, Gelfan AN, Harman C, Kleidon A, Bogaard TA, Wang D, Wagener T, Scherer U, Zehe E, Bierkens MFP, Di Baldassarre G, Parajka J, Van Bee... (2014).  Advancing catchment hydrology to deal with predictions under change.  Hydrology and Earth System Sciences.  18(2).
  • Harman C, Troch PA (2014).  What makes Darwinian hydrology "darwinian"? Asking a different kind of question about landscapes.  Hydrology and Earth System Sciences.  18(2).
  • Li HY, 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.
  • Harman CJ, Lohse KA, Troch PA, 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).
  • Thompson SE, Sivapalan M, Harman CJ, Srinivasan V, Hipsey MR, Reed P, Montanari A, Blöschl G (2013).  Developing predictive insight into changing water systems: Use-inspired hydrologic science for the anthropocene.  Hydrology and Earth System Sciences.  17(12).
  • Troch PA, Berne A, Bogaart P, Harman C, Hilberts AGJ, Lyon SW, Paniconi C, Pauwels VRN, Rupp DE, Selker JS, Teuling AJ, Uijlenhoet R, Verhoest NEC (2013).  The importance of hydraulic groundwater theory in catchment hydrology: The legacy of Wilfried Brutsaert and Jean-Yves Parlange.  Water Resources Research.  49(9).
  • Montanari A, Young G, Savenije HHG, Hughes D, Wagener T, Ren LL, Koutsoyiannis D, Cudennec C, Toth E, Grimaldi S, Blöschl G, Sivapalan M, Beven K, Gupta H, Hipsey M, Schaefli B, Arheimer B, Boegh E, S... (2013).  "Panta Rhei-Everything Flows": Change in hydrology and society-The IAHS Scientific Decade 2013-2022.  Hydrological Sciences Journal.  58(6).
  • Pelletier JD, Barron-Gafford GA, Breshears DD, Brooks PD, Chorover J, Durcik M, Harman CJ, Huxman TE, Lohse KA, Lybrand R, Meixner T, McIntosh JC, Papuga SA, Rasmussen C, Schaap M, Swetnam TL, Troch P... (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).
  • Gall HE, Park J, Harman CJ, Jawitz JW, Rao PSC (2013).  Landscape filtering of hydrologic and biogeochemical responses in managed catchments.  Landscape Ecology.  28(4).
  • Patil S, Sivapalan M, Hassan MA, Ye S, Harman CJ, Xu X (2012).  A network model for prediction and diagnosis of sediment dynamics at the watershed scale.  Journal of Geophysical Research F: Earth Surface.  117(4).
  • Zanardo S, Harman CJ, Troch PA, Rao PSC, Sivapalan M (2012).  Intra-annual rainfall variability control on interannual variability of catchment water balance: A stochastic analysis.  Water Resources Research.  48(1).
  • Rao PSC, Basu NB, Zanarado S, Harman CJ, Sivapalan M, Rinaldo A (2011).  Modelling hydrologic and geochemical filtering of reactive solute transport in catchments.  IAHS-AISH Publication.  342.
  • Carrillo G, Troch PA, 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).
  • Sivapalan M, Thompson SE, Harman CJ, Basu NB, Kumar P (2011).  Water cycle dynamics in a changing environment: Improving predictability through synthesis.  Water Resources Research.  47(10).
  • Harman CJ, Rao PSC, Basu NB, McGrath GS, Kumar P, Sivapalan M (2011).  Climate, soil, and vegetation controls on the temporal variability of vadose zone transport.  Water Resources Research.  47(9).
  • Thompson SE, Harman CJ, Schumer R, Wilson JS, Basu NB, Brooks PD, Donner SD, Hassan MA, Packman AI, Rao PSC, Troch PA, Sivapalan M (2011).  Patterns, puzzles and people: Implementing hydrologic synthesis.  Hydrological Processes.  25(20).
  • Thompson SE, Harman CJ, Konings AG, Sivapalan M, Neal A, Troch PA (2011).  Comparative hydrology across AmeriFlux sites: The variable roles of climate, vegetation, and groundwater.  Water Resources Research.  47(7).
  • Thompson SE, Harman CJ, Troch PA, Brooks PD, Sivapalan M (2011).  Spatial scale dependence of ecohydrologically mediated water balance partitioning: A synthesis framework for catchment ecohydrology.  Water Resources Research.  47(5).
  • Guan K, Thompson SE, Harman CJ, Basu NB, Rao PSC, Sivapalan M, Packman AI, Kalita PK (2011).  Spatiotemporal scaling of hydrological and agrochemical export dynamics in a tile-drained Midwestern watershed.  Water Resources Research.  47(5).
  • Schaefli B, Harman CJ, Sivapalan M, Schymanski SJ (2011).  HESS Opinions: Hydrologic predictions in a changing environment: Behavioral modeling.  Hydrology and Earth System Sciences.  15(2).
  • Harman CJ, Troch PA, 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).
  • Sivapalan M, Yaeger MA, Harman CJ, Xu X, Troch PA (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).
  • Wagener T, Sivapalan M, Troch PA, McGlynn BL, Harman CJ, Gupta HV, Kumar P, Rao PSC, Basu NB, Wilson JS (2010).  The future of hydrology: An evolving science for a changing world.  Water Resources Research.  46(5).
  • Harman CJ, Reeves DM, Baeumer B, Sivapalan M (2010).  A subordinated kinematic wave equation for heavy-tailed flow responses from heterogeneous hillslopes.  Journal of Geophysical Research: Earth Surface.  115(1).
  • Hopp L, Harman C, Desilets SLE, Graham CB, McDonnell JJ, Troch PA (2009).  Hillslope hydrology under glass: Confronting fundamental questions of soil-water-biota co-evolution at Biosphere 2.  Hydrology and Earth System Sciences.  13(11).
  • Harman CJ, Sivapalan M, Kumar P (2009).  Reply to comment by J. Szilagyi on textquotedblleftPower law catchment-scale recessions arising from heterogeneous linear small-scale dynamicstextquotedblright.  45.  n--a--n--a.
  • Harman CJ, Sivapalan M, Kumar P (2009).  Power law catchment-scale recessions arising from heterogeneous linear small-scale dynamics.  Water Resources Research.  45(9).
  • Troch PA, Martinez GF, Pauwels VRN, Durcik M, Sivapalan M, Harman CJ, Brooks PD, 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).
  • 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(1).
  • De Rose RC, Stewardson MJ, Harman C (2008).  Downstream hydraulic geometry of rivers in Victoria, Australia.  Geomorphology.  99(1-4).
  • Harman C, Stewardson M, DeRose R (2008).  Variability and uncertainty in reach bankfull hydraulic geometry.  Journal of Hydrology.  351(1-2).
  • Harman C, Stewardson M (2005).  Optimizing dam release rules to meet environmental flow targets.  River Research and Applications.  21(2-3).
Book Chapters
  • Rao PSC, Basu NB, Zanarado S, Harman CJ, Sivapalan M, Rinaldo A (2011).  Modelling hydrologic and geochemical filtering of reactive solute transport in catchments.  Gq10: Groundwater Quality Management in a Rapidly Changing World.  342.  451-454.
  • "B43E-2181:  Merging Hydrologic, Geochemical, and Geophysical Approaches to Understand the Regolith Architecture of a Deeply Weathered Piedmont Critical Zone.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "H43U-01:  Using Emergent and Internal Catchment Data to Elucidate the Influence of Landscape Structure and Storage State on Hydrologic Response in a Piedmont Watershed.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "H44F-08:  Hydrologic connections between environmental and societal change at the Bonneville Salt Flats, Utah.", American Geophysical Union, Fall Meeting, 11-15 Dec 2018.  January 1, 2017
  • "H51A-1255:  The importance of temporal inequality in quantifying vegetated filter strip removal efficiencies.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "H21O-03:  Effects of snowmelt on watershed transit time distributions.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "Weathering in hillslopes", Critical Zone Observatories All-Hands Meeting, Arlington VA, June 2017.  January 1, 2017
  • "A unified approach to hydrologic flow and transport in the evolving critical zone", Department of Earth and Planetary Science, Washington University of St Louis.  January 1, 2017
  • "B43E-2179: Flow pathways in the evolving critical zone -- insights from hydraulic groundwater theory.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "Flushing the saprolite: baseflow and quickflow age variability in the streamflow of a deeply-weathered piedmont watershed", Geologic Society of America South East Regional Meeting, Richmond VA, March 2017.  January 1, 2017
  • "Scalar Transport in Complex Hydrodynamic Systems using a Lumped-Lagrangian Approach", Center for Environmental and Applied Fluid Mechanics, Johns Hopkins University.  January 1, 2017
  • "The control of critical zone architecture on water age and storage selection functions in hillslopes", Critical Zone Observatories All-Hands Meeting, Arlington VA, June 2017.  January 1, 2017
  • "H21O-01:  Does age matter? Controls on the spatial organization of age and life expectancy in hillslopes, and implications for transport parameterization using rSAS.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "Weathering in hillslopes", AGU-SEG Hydrogeophysics Workshop, Stanford, CA, July 24-27 2017.  January 1, 2017
  • "H41I-1556:  Does Variability in Shallow Hydraulic Conductivity Explain Subsurface Electrical Resistivity Anomalies in a Piedmont Hillslope.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "EP11C-1568:  Modeling Episodic Ephemeral Brine Lake Evaporation and Salt Crystallization on the Bonneville Salt Flats, Utah.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "Model-Data Learning to Identify Runoff Generation Mechanisms in a Small Forested Piedmont Watershed", Critical Zone Observatories All-Hands Meeting, Arlington VA, June 2017.  January 1, 2017
  • "The Influence of Catchment Structure on Hydrologic Response in a Small Forested Piedmont Watershed", Gordon Research Conference on Catchment Science: Interactions of Hydrology, Biology and Lewiston Geochemistry, ME.  January 1, 2017
  • "H43O-01:  Hydrologic Synthesis Across the Critical Zone Observatory Network: A Step Towards Understanding the Coevolution of Critical Zone Function and Structure.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "How Does Spatial Variability in Rainfall and ET Affect Catchment Flow Velocities?", Gordon Research Seminar, June 24-25, Bates College, Lewiston, ME.  January 1, 2017
  • "H23E-1742:  What Can Catchment Transit Time Distributions Tell Us About Runoff Mechanisms? Exploring “Age Equifinality“ with an Integrated Surface-Groundwater Model.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "H22A-04:  Real-time isotope monitoring network at the Biosphere 2 Landscape Evolution Observatory resolves meter-to-catchment scale flow dynamics.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "B43A-2105:  Controlled experiments of hillslope co-evolution at the Biosphere 2 Landscape Evolution Observatory: toward prediction of coupled hydrological, biogeochemical, and ecological change (Invited).", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "Shaping the Critical Zone : Lateral flow controls on feedbacks between deep drainage and weathering front slopes", Critical Zone All-Hands Meeting, Arlington, VA.  January 1, 2017
  • "A real-time isotope monitoring network at the Biosphere 2 – Landscape Evolution Observatory", International workshop on “Isotope-based studies of water partitioning and plant-soil interactions in forested and agricultural environments”, 27-29 September 2017, Villa Montepaldi, San Casciano in Val di Pesa, Tuscany, Italy.  January 1, 2017
  • "H13D-1417:  Determining hyporheic storage using the rSAS model in urban restored streams.", American Geophysical Union, Fall Meeting, 11-15 Dec 2017.  January 1, 2017
  • "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
  • "Physical Basis for Storage-Dependent Age Distributions of Water Discharged from an Experimental Hillslope (H21B-1387)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Spatial and Temporal Variation in the Isotopic Composition of Ethiopian Rainfall (PP31D-2334)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Assessing a novel approach to proxy system modeling of speleothem δ18O values (H12A-04)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Combining Multi-Scale Observations and Modeling to Better Understand the Influence of Landscape Structure and Hydrologic Processes on Transport in Piedmont Landscapes", Johns Hopkins University Environmental Engineering and Chemistry Seminar, Baltimore, MD.  January 1, 2016
  • "The accuracy of steady-state transit time estimates in a non-steady climate: Modeling experiment setup in a Valley and Ridge agricultural watershed", CUAHSI Biennial Colloquia on Water Science, Shepherdstown, WV.  January 1, 2016
  • "Modeling the sensitivity of shallow subsurface catchment transit times to rainfall variability under present and future climate. (H43M-02)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Soil, Water, Plants and Preferred Flow in All Directions: A Biosphere-2 Experiment (H13E-1417)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Water Balance Modeling to Identify the Time-Variable Contribution of Hillslope and Riparian Fluxes to Discharge in a Small Forested Piedmont Watershed (H54E-06)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "The age structure of flows through hydrologic systems across scales", Department of Hydrology and Tsinghua University Hydraulics, Beijing, China.  January 1, 2016
  • "Can a simple lumped parameter model simulate complex transit time distributions? Benchmarking experiments in a virtual watershed. (H21B-1385)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "A unified approach to hydrologic flow and transport in the critical zone", Department of Earth and Environmental Science, Temple University, Philadelphia, PA.  January 1, 2016
  • "Age-ranked storage and age-ranked discharge relationships at a hillslope scale: controls of physical processes, boundary conditions, climate variability, and hillslope shape (H21B-1386)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Age-ranked storage-discharge relationships across diverse hydrologic systems (H14D-03)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "rSAS: The new theory of water age, and what it can teach us about how catchments function", Department of Biological and Ecological Engineering, Oregon State University, Corvallis, OR.  January 1, 2016
  • "The age structure of flows through hydrologic systems across scales", Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing, China.  January 1, 2016
  • "A unified approach to hydrologic flow and transport in the critical zone", Department of Civil and Environmental Engineering, University of California, Irvine, CA.  January 1, 2016
  • "An Improved Method for Interpretation of Concentration-Discharge Relationships in Riverine Water-Quality Data (H43A-1393)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Cleaves Revisited: Consequences of Inverted Bedrock Topography on Chemical Weathering Rates in a Classic Study Watershed (EP43C-0988)", American Geophysical Union Fall Meeting, San Francisco, CA.  January 1, 2016
  • "Project overview: Impacts of climate change on the phenology of linked agriculture-water systems", Chesapeake Modeling Symposium, Williamsburg, VA.  January 1, 2016
  • "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.  December 1, 2015
  • "Internal versus external controls on age variability: Definitions, origins and implications in a changing climate", American Geophysical Union Fall Meeting.  San Francisco, CA.  December 1, 2015
  • "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.  December 1, 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.  December 1, 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.  December 1, 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.  December 1, 2015
  • "rSAS: The new theory of water age, and what it can teach us about how catchments function", Department of Geology Seminar.  Kent, Ohio.  November 1, 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.  September 1, 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.  September 1, 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.  June 1, 2015
  • "StorAge Selection functions as a bridge between groundwater transport and integrated watershed models", Workshop on Integrated Environmental Modeling of Estuarine Systems.  Davis, CA.  May 1, 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.  April 1, 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.  March 1, 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.  March 1, 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.  March 1, 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.  March 1, 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.  March 1, 2015
  • "Transit time distributions in a changing world: New theory for hydrologic transport under non-stationarity", National Research Program Seminar.  Reston, VA.  February 1, 2015
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Chesapeake Bay Program Office, Modeling Workgroup.  Annapolis, MD.  January 1, 2015
  • "Modeling of Time-Varying Stream Water Age Distributions: Preliminary Investigations with Non-Conservative Solutes", Fall Meeting.  San Francisco, CA.  December 1, 2014
  • "Modeling hyporheic exchange and in-stream transport with time-varying transit time distributions", Fall Meeting.  San Francisco, CA.  December 1, 2014
  • "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.  December 1, 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.  December 1, 2014
  • "Distinguishing sources of variability in catchment transit time distributions: climate, water balance partitioning, and flow-path dynamics", Fall Meeting.  San Francisco, CA.  December 1, 2014
  • "Recent advances towards a theory of catchment hydrologic transport: age-ranked storage and the rSAS-functions", Fall Meeting.  San Francisco, CA.  December 1, 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.  December 1, 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.  December 1, 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 Geological Sciences Seminar.  Newark, DE.  October 1, 2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", Department of Infrastructure Engineering Seminar.  Melbourne, Australia.  June 1, 2014
  • "Modeling unsteady lumped transport with time-varying transit time distributions", School of Earth and Environment Seminar.  Perth, Australia.  May 1, 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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