Personal profile

Research Interests

My research focuses on water, sediments, and microbiota, with particular emphasis on the basic processes that control interfacial dynamics in aquatic systems and the coupling of physical transport processes with biological and biogeochemical processes.  I seek to define critical structure-transport-transformation relationships in dynamic environments such as rivers and surface-attached microbial communities (biofilms).  My work is highly collaborative and encompasses fluid mechanics, particle transport and morphodynamics, aquatic chemistry, and microbiology.  Important applications include benthic microbial ecology, nutrient and carbon cycling, contaminant transport and water quality, ecosystem degradation and restoration, waterborne disease transmission, and control of biofilms in human infection and engineered water systems.

Education / Academic qualification

Environmental Engineering and Science, Minor in Geology, PhD, California Institute of Technology

… → 1997

Environmental Engineering and Science, MS, California Institute of Technology

… → 1992

Mechanical Engineering, with minor in History, BS, Washington University in St. Louis

… → 1991


  • Microbial transport processes
  • Environmental transport processes

Fingerprint Fingerprint is based on mining the text of the persons scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

  • 6 Similar Profiles
biofilm Earth & Environmental Sciences
solute Earth & Environmental Sciences
colloid Earth & Environmental Sciences
sediment Earth & Environmental Sciences
bedform Earth & Environmental Sciences
hyporheic zone Earth & Environmental Sciences
hydrodynamics Earth & Environmental Sciences
solute transport Earth & Environmental Sciences

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Research Output 1995 2018

1 Citations

Comparison of biofilm cell quantification methods for drinking water distribution systems

Waller, S. A., Packman, A. I. & Hausner, M. Jan 1 2018 In : Journal of Microbiological Methods. 144, p. 8-21 14 p.

Research output: Contribution to journalArticle

Drinking Water
Confocal Microscopy
Water Quality
Flow Cytometry

Interplay between flow and bioturbation enhances metal efflux from low-permeability sediments

Xie, M., Wang, N., Gaillard, J. F. & Packman, A. I. Jan 1 2018 In : Journal of Hazardous Materials. 341, p. 304-312 9 p.

Research output: Contribution to journalArticle


A Process-Based Model for Bioturbation-Induced Mixing

Aquino, T., Roche, K. R., Aubeneau, A., Packman, A. I. & Bolster, D. Dec 1 2017 In : Scientific Reports. 7, 1, 14287

Research output: Contribution to journalArticle

burrowing organism
sediment-water interface
2 Citations

Benthic biofilm controls on fine particle dynamics in streams

Roche, K. R., Drummond, J. D., Boano, F., Packman, A. I., Battin, T. J. & Hunter, W. R. Jan 1 2017 In : Water Resources Research. 53, 1, p. 222-236 15 p.

Research output: Contribution to journalArticle

particulate organic matter
3 Citations

Biofilm-induced bioclogging produces sharp interfaces in hyporheic flow, redox conditions, and microbial community structure

Caruso, A., Boano, F., Ridolfi, L., Chopp, D. L. & Packman, A. May 28 2017 In : Geophysical Research Letters. 44, 10, p. 4917-4925 9 p.

Research output: Contribution to journalArticle

redox conditions
microbial community
hyporheic zone