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Title: Hyporheic Exchange Due to Cobbles on Sandy Beds

Journal Article · · Water Resources Research
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Utah State University, Logan, UT (United States); Purdue University, West Lafayette, IN (United States); Utah State Univ., Logan, UT (United States)
  2. Purdue University, West Lafayette, IN (United States)
  3. Pennsylvania State University, University Park, PA (United States)
  4. University of Texas, Austin, TX (United States)

Hyporheic exchange induced by riverbed topography and roughness provides important ecosystem functions. We investigated how cobble clusters embedded in a finer-grained sand bed affect the near-bed channel flow and the exchange of surface and subsurface water. We tested how the spacing and embeddedness of cobbles altered hyporheic exchange through a three-dimensional fully coupled surface-subsurface model. The 3D modeling framework captured the full physics of the exchange process locating the lateral position of upwelling zones on the side of the cobble. As the cobbles protrude more into the channel, eddies appear downstream, with smaller vortices where cobbles are closer together. In our simulations, hyporheic exchange increased with the spacing and protrusion ratio. The travel time in the hyporheic zone also increased with the protrusion ratio because the hyporheic flow paths are longer when the cobble is more protruded. With different spacings at the highest protrusion ratio, the average slope of early time breakthrough curve was steeper for large spacing settings: the travel time increases as the spacing decreases.

Research Organization:
University of Texas, Austin, TX (United States); Purdue University, West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Purdue Research Foundation; US Department of Agriculture (USDA)
Grant/Contract Number:
SC0018042
OSTI ID:
1978569
Journal Information:
Water Resources Research, Journal Name: Water Resources Research Journal Issue: 1 Vol. 58; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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