Early Registration Deadline
12 February 2010

Travel Award & Grant Recipients Notified
March 2010

Authors Notified
April 2010

Schedule Posted
January 2010

Ward, A. S., Department of Civil & Environmental Engineering, Penn State University, University Park, PA, USA, asw178@psu.edu
Gooseff, M. N., Department of Civil & Environmental Engineering, Penn State University, University Park, PA, USA, mgooseff@engr.psu.edu
Miller, M. P., Utah Water Science Center, U.S. Geological Survey, West Valley City, UT, USA, mamiller@usgs.gov
Boyer, E. W., School of Forest Resources, Penn State University, University Park, PA, USA, ewb100@psu.edu
Ferreri, C. P., School of Forest Resources, Penn State University, University Park, PA, USA, cpf3@psu.edu

HYPORHEIC RESPONSE TO STREAMBED CLOGGING: A FIELD AND NUMERICAL STUDY

Hyporheic exchange promotes a number of ecosystem processes, including processing of nutrients, buffering stream temperatures, and maintaining a unique subsurface habitat supporting a diverse group of organisms. The rate of hyporheic exchange and its extent are known to be functions of the physical characteristics of the near-stream aquifer, particularly hydraulic conductivity. However, the effects of another potentially important characteristic, streambed clogging, are poorly understood. We present results from replicate tracer studies that were conducted before and after an injected pulse of sediment and organic matter in a headwater stream under a steady state flow regime. Conservative tracer study results and the variation of chemical elements in the water column and in piezometers demonstrate temporal and spatial shifts in subsurface transport of water and solutes in response to the pulse. We hypothesize that changes in subsurface flowpaths are due to streambed clogging by fine sediments and organic material. We explored the relationship between streambed hydraulic conductivity and hyporheic flowpaths through numerical modeling. Results demonstrate hyporheic response to a range of spatial patterns and degree of clogging.

Session #:T27
Date: 06-09-10
Time: 10:30

Presentation is given by student: Yes