Impacts of evaporation-induced groundwater upwelling on mixing dynamics in shallow wetlands

Authors:
Xiaolong GengMichel C. BoufadelHailong Li
Owners: Xiaolong Geng
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Created: May 22, 2023 at 6:59 p.m.
Last updated: May 22, 2023 at 8:55 p.m. (Metadata update)
Published date: May 22, 2023 at 8:54 p.m.
DOI: 10.4211/hs.135b355a2aec44c49308b463eee5decc
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Sharing Status: Published
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Abstract

Groundwater mixing dynamics play a crucial role in the biogeochemical cycling of shallow wetlands. In this paper, we conducted groundwater simulations to investigate the combined effects of evaporation and local heterogeneity on mixing dynamics in shallow wetland sediments. The results show that evaporation causes groundwater and solutes to upwell from deep sediments to the surface. As the solute reaches the surface, evaporation enhances the accumulation of the solute near the surface, resulting in a higher solute concentration than in deep sediments. Mapping of flow topology reveals that local heterogeneity generates spatially varied mixing patterns mainly along preferential flow pathways. The upwelling of groundwater induced by surface evaporation through heterogeneous sediments is likely to create distinct mixing hotspots that differ spatially from those generated by lateral preferential flows driven by large-scale hydraulic gradients, which enhances the overall mixing in the subsurface. These findings have strong implications for biogeochemical processing in wetlands.

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Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation Collaborative Research: Impact of evaporation and waves on groundwater dynamics in tidally influenced beaches 2130595

How to Cite

Geng, X., M. C. Boufadel, H. Li (2023). Impacts of evaporation-induced groundwater upwelling on mixing dynamics in shallow wetlands, HydroShare, https://doi.org/10.4211/hs.135b355a2aec44c49308b463eee5decc

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

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