Bed form-induced hyporheic exchange and geochemical hotspots

Authors:
Faranak BehzadiCorey David WallaceDylan WardHaiyan ZhouRoelof VersteegReza Soltanian
Owners: Faranak Behzadi
  • Contributions
    Joined

Type: Resource
Storage: The size of this resource is 174.0 MB
Created: Jan 14, 2021 at 4 p.m.
Last updated: Jun 04, 2021 at 2:14 p.m.
Citation: See how to cite this resource
Sharing Status: Public
Views: 1145
Downloads: 42
+1 Votes: Be the first one to 
 this.
Comments: No comments (yet)

Abstract

Small-scale bed form topographies control hyporheic exchange and biogeochemical processes within aquatic sediments, which ultimately affect water quality and nutrient cycling at the watershed scale. The impact of three-dimensional (3D) and small-scale bed form topographies on hyporheic exchange and solute mixing is investigated in the present work. The effect of bed form morphologies on the development of zones of enhanced reaction rates (i.e., hot spots) is also studied. A computational fluid dynamics model to simulate river flow over bed forms is combined with a subsurface flow and multicomponent reactive solute transport model. A wide variety of bed form topographies are generated using geometric models by varying parameters controlling curvature as well as bed form wavelength and amplitude. Our results confirm that the pressure distribution at the sediment-water interface is strongly affected by the bed form geometry. Higher phase shifts in bed form shapes result in overall higher average velocity, larger zones of enhanced pressure and reaction rates, and higher amounts of solute exchange. Moreover, the bed form shapes control the reaction process for a wide range of sediment conductivities. This study advances the understanding of the effects of complex and small scale morphological features on hyporheic exchange processes.

Subject Keywords

Content

    No files to display.

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
University of Cincinnati Start up
U.S. Department of Energy SBIR DE-SC0019621
National Science Foundation EAR EAR-PF 1855193

How to Cite

Behzadi, F., C. D. Wallace, D. Ward, H. Zhou, R. Versteeg, R. Soltanian (2021). Bed form-induced hyporheic exchange and geochemical hotspots, HydroShare, http://www.hydroshare.org/resource/e6b1394d006a430f9cac331f9f251d1b

This resource is shared under the Creative Commons Attribution-NoCommercial CC BY-NC.

 http://creativecommons.org/licenses/by-nc/4.0/
CC-BY-NC

Comments

There are currently no comments

New Comment

required