Referred Journal Publications

- Variation of soil moisture patterns in response to anthropogenic land disturbances in a semiarid regional landscape, C. Camarena, J. Ren and K. Jones, and A. Hempel, in preparation.

- Modeling and Laboratory Column Study of Polydisperse Colloid Transport through Saturated Porous Media, S. Peddireddy and J. Ren, in preparation.

- Changes in Fine Sediment Size Distributions due to Interactions with Streambed Sediments, J. Ren and A.I. Packman, Sedimentary Geology, in press.

- Coupled Stream-Subsurface Exchange of Colloidal Hematite and Dissolved Zinc, Copper and Phosphate, J. Ren and A.I. Packman, Environmental Science & Technology, the Charles R. O'Melia tribute issue, Particles and Interfaces in Aquatic Systems, 39, 6387-6394, 2005.

- Stream-Subsurface Exchange of Zinc in the Presence of Silica and Kaolinite Colloids, J. Ren and A.I. Packman, Environmental Science & Technology, 38, 6571-6581, 2004.

- Modeling of Simultaneous Exchange of Colloids and Sorbing Contaminants between Streams and Streambeds, J. Ren and A.I. Packman, Environmental Science & Technology, 38, 2901-2911, 2004.

- Effects of suspended sediment characteristics and bed sediment transport on streambed clogging, K. Rehg, A.I. Packman, and J. Ren, Hydrological Processes, 19(2), doi: 10.1002/hyp.5540, 413-427.

- Stream-subsurface exchange, suspended sediment transport, and the coupled transport of colloids and contaminants in streambeds, J. Ren and A.I. Packman, International Journal of Sediment Research, 18(2), 199-207, 2003.

- Effect of Background Water Composition on Stream-Subsurface Exchange of Submicron Colloids, J. Ren and A.I. Packman, Journal of Environmental Engineering-ASCE, Vol. 128, No. 7, 624-634, July 2002.

- Analysis of an observed relationship between colloid collision efficiency and mean collector grain size, J. Ren, A.I. Packman, and C. Welty, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 191, No. 1-2, p. 133-144, 2001.

- Correlation of Colloid Collision Efficiency with Hydraulic Conductivity of Silica Sands, J. Ren, A.I. Packman and C. Welty, Water Resources Research, Vol. 36, No. 9, 2493-2500, Sept., 2000.

Non-Refereed Publications

-1. M. Alcala, Jr., K. D. Jones, and J. Ren, Compost Product Optimization for Stormwater Biofiltration Applications, Proceedings of the 98th Annual Air & Waste Management Association Conference, 2005.

- A.I. Packman and J. Ren, 2003. Multi-phase contaminant transport in sediment beds, Proceedings of the World Water and Environmental Resources Congress, Philadelphia, PA, June 22-26, 2003.

Invited Presentations

- Particle Dynamics, Contaminant Transport, and Biological Interactions in Water Systems, J. Ren, Texas A&M University Kingsville, Kingsville, TX, Feb. 21, 2006.

- Transport of Colloids and Sorbing Contaminants between Streams and Streambeds, J. Ren, University of Minnesota, National Center for Earth-surface Dynamics (NCED), St. Anthony Falls Laboratory, Minneapolis, MN, Nov. 16-17, 2004.

- Changes in Fine Sediment Size Distributions due to Interactions with Streambed Sediments, J. Ren and A.I. Packman, Particle Size to Sediment Dynamics International Workshop, Hanse Institute of Advanced Studies, Delmenhorst, Germany, 15 – 18 April 2004

- Implications of Hyporheic Exchange Processes for Contaminant Transport in Streams and Stream Beds, A.I. Packman and J. Ren, AGU Spring Meeting, Washington, D.C., May 28-31, 2002.

- Implications of the Coupled Transport of Colloids and Contaminants in Streams and Streambeds, J. Ren and A.I. Packman, US-Chinese Joint Workshop on Sediment Transport and Environmental Studies, Milwaukee, Wisconsin, USA, July 21-28, 2002.

- Stream-Subsurface Exchange of Sub-micron Colloids and Adsorbing Contaminants, J. Ren, Northwestern University, Illinois, USA, Feb. 13, 2002.

- A Blackwater Model Update, J. Ren, The Procter & Gamble Company, Cincinnati, Ohio, USA, August 23, 2001.

Conference Presentations

- Chemical Contamination and Toxicity of the Lower Rio Grande near Laredo, TX , B. Flores and J. Ren, The Texas A&M University System, the Third Annual Pathways to the Doctorate Research Symposium, Texas A&M University-Kingsville, Kingsville, TX, November 4-5, 2005.

- Variation of Soil Moisture Patterns in Response to Anthropogenic Land Disturbances in a Semiarid Regional Landscape, C. Camarena, J. Ren, K. Jones, and A. Hempel, AGU fall meeting, San Francisco, California, 5–9 December 2005.

- Modeling and Laboratory Column Study of Transport of Polydisperse Colloids through Saturated Porous Media, S. Peddireddy and J. Ren, 79th ACS Colloid and Surface Science Symposium, Clarkson University and Center for Advanced Materials Processing (CAMP), Potsdam, NY, June 12-15, 2005.

- Water Balance Study on a Semiarid Regional Landscape in South Texas: Effects of Anthropogenic Land Disturbance, C. Camarena, J. Ren and K. Jones, AGU fall meeting, San Francisco, California, December 13-17, 2004.

- Evolution of the size distribution of fine suspended sediments during downstream transport: Role of stream-subsurface exchange, J. Ren and A.I. Packman, AGU fall meeting, San Francisco, California, December 13-17, 2004.

- Characterization of Particle Aggregation and its Implications on the Transport of Colloids in Streams and Streambeds, S. Peddireddy and J. Ren, The Texas A&M University System, 2nd Annual TAMUS Pathways Student Research Symposium, Texas A&M University-Corpus Christi, TX, Oct. 15-16, 2004.

- Approximation of Particle Residence Times in Streambeds Using Statistic Distribution models, S. Gobal and J. Ren, The Texas A&M University System, 2nd Annual TAMUS Pathways Student Research Symposium, Texas A&M University-Corpus Christi, TX, Oct. 15-16, 2004.

- Effects of Anthropogenic Land Disturbances on a Semiarid Regional Landscape Water Balance in South Texas, C. Camarena, J. Ren, K. Jones, and V. Uddameri, Sustainable Development in the Rio Bravo/Rio Grande Borderlands, 2004 Annual Rio Bravo Association Conference, Texas A&M University – Kingsville, Kingsville, TX, April 1-3, 2004.

- Exchange of Colloids and Sorbing Contaminants between Streams and Streambeds and its implications in Semiarid Rivers and Estuaries, J. Ren, 2004 Border Regional Environmental Conference, Integrating Policy, Training, Education, and Sustainability Science for the U.S. - Mexican Border Region, Texas A&M International University, Laredo, Texas, Feb. 11-13, 2004

- Modeling and Experimental Studies of Simultaneous Exchange of Colloids and Sorbing Contaminants between Streams and Streambeds, J. Ren and A.I. Packman, AGU fall meeting, San Francisco, California, 6-10 December 2002.

- Fundamental Processes Controlling Stream-Subsurface Exchange of Colloids and Contaminants, J. Ren and A.I. Packman, ACS 76th Colloid and Surface Science Symposium, Ann Arbor, Michigan, June 23-26, 2002.

- Relationship Between Colloid Filtration and Media Hydraulic Conductivity, J. Ren, A.I. Packman, and C. Welty, presented at the AGU fall meeting, San Francisco, California, December 1999, Eos. Vol. 80, Abstract H32C-05.

- Particle size and ionic strength effects on stream-subsurface exchange of colloids, J. Ren, A.I. Packman and D. Jerolmack, presented at the AGU spring meeting, Washington DC, May 29-June 2, 2000, Eos. Vol. 81, Abstract H42A-10, p. S233.

- Variation in Colloid Collision Efficiency Due to the Size of Collector Media. J. Ren, A.I. Packman and C. Welty, presented at the 74th Colloid and Surface Science Symposium, ACS, Lehigh University, Bethlehem, Pennsylvania, June 19-21, 2000.