The Influence of Streambed Heterogeneity on Reactive Solute Transport in Gravelly Rivers
Abstract
Hyporheic zone (HZ) play an important role in reactive solute transport in rivers. Deposits of open-framework gravel (OFG) occurring in gravelly streambeds that can exert a significant control on hyporheic flow. We numerically simulate flow and transport of a reactive solute within HZ containing OFG stratasets. We represent OFG stratasets with commonly observed characteristics including a volume fraction of about one-third of the streambed sediment, a hydraulic conductivity two orders of magnitude greater than other strata present, and a spatial connectivity forming preferential-flow pathways. To represent chemical heterogeneity, we consider spatial heterogeneity in equilibrium sorption distribution coefficient. We present our flow and transport results and show how the correlation between the conductivity and sorption coefficient affect reactive solute transport within HZ.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.H23K2092L
- Keywords:
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- 0408 Benthic processes;
- BIOGEOSCIENCESDE: 0414 Biogeochemical cycles;
- processes;
- and modeling;
- BIOGEOSCIENCESDE: 1806 Chemistry of fresh water;
- HYDROLOGYDE: 1830 Groundwater/surface water interaction;
- HYDROLOGY