Experimentally obtained velocity and pressure fields of an open channel flow around a cylinder using RIM-SPIV


  • William Jeffery Reeder Center for Ecohydraulics Research, University of Idaho
  • Jose Roberto Moreto Department of Aerospace Engineering, San Diego State University
  • Xiaofeng Liu Department of Aerospace Engineering, San Diego State University
  • Daniele Tonina Center for Ecohydraulics Research, University of Idaho




pressure from velocity, refractive index matching


The quantification of velocity and pressure fields over streambeds is important for predicting sediment mobility and water exchange between stream and sediment interstitial spaces (Schmeeckle and Nelson, 2003; Tonina and Buffington, 2009). The latter is typically referred as hyporheic flow, which consists of surface water that flows through the streambed sediment pores (Tonina and Buffington, 2009). These fluxes are mainly driven by pressure gradients at the water sediment interface. In this paper, we report an experimental investigation of the time-averaged velocity and pressure field, quantified in a set of laboratory experiments using stereo PIV (Particle Image Velocimetry) with a non-toxic index-matched fluid, for an open channel flow around a barely submerged vertical cylinder as a model for plant stalk over a plane bed of coarse granular sediment, mimicking a stream gravel bed. This is the first time that such a velocity and pressure field is characterized experimentally for a free surface flow with irregular floor contour.

Author Biography

William Jeffery Reeder, Center for Ecohydraulics Research, University of Idaho

Jeff Reeder is currently a post-doctoral research fellow at the University of Idaho in the Department of Civil and Environmental Engineering. He is member of the research team at the Center for Ecohydraulics Research at the University of Idaho. He holds a Ph. D. (2017) and a Master’s degree (2012) in Civil Engineering from the University of Idaho. He also holds Master’s (1995) and Bachelor’s (1993) degrees in Materials Engineering from Wright State University in Dayton, Ohio. His current research interests include hyporheic flows and the effects that hyporheic flows have on biochemical processes in riverine systems. Additionally, he has a strong interest in developing new methodologies and instrumentation to improve the hydrodynamic, morphological and biochemical measurements that are used to access, monitor and model biological and hydrodynamic processes in aquatic systems.
Prior to joining the University of Idaho, Jeff worked for fifteen years as an Engineer at Micron Technology, a world leading semiconductor manufacturer, in Boise, Idaho. He held several leadership positions during his tenure at Micron Technology. His favorite activity while at Micron was to solve problems that others had deemed to be intractable. He was awarded 21 U.S. Patents during his time there.






Pressure and Force