2019 CSDMS meeting-029: Difference between revisions

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{{CSDMS meeting abstract title temp2019
{{CSDMS meeting abstract title temp2019
|CSDMS meeting abstract title=Coupled morphodynamic and hydrogeologic modeling for evaluating the salinization of groundwater resources in coastal deltas
|CSDMS meeting abstract title=Coupled morphodynamic and hydrogeologic modeling for evaluating the salinization of groundwater resources in coastal deltas resources in coastal deltas
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|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor email address=dallen@sfu.ca
|CSDMS meeting coauthor email address=dallen@sfu.ca
}}
{{CSDMS meeting authors template
|CSDMS meeting coauthor first name abstract=Jeremy
|CSDMS meeting coauthor last name abstract=Venditti
|CSDMS meeting coauthor institute / Organization=Simon Fraser University
|CSDMS meeting coauthor town-city=Buranaby
|CSDMS meeting coauthor country=Canada
|CSDMS meeting coauthor email address=jeremy_venditti@sfu.ca
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{{CSDMS meeting abstract template 2019
{{CSDMS meeting abstract template 2019
|CSDMS meeting abstract=Anthropogenic activities associated with climate change and urbanization in coastal deltas (i.e. groundwater overdrafts, coastal engineering and urban loading) have resulted in freshwater degradation through the upwelling of saline paleowater. Factors controlling the preservation of paleowater, and the initiation of exfiltration and subsequent upwelling of saline water are not yet well understood. This research uses morphodynamic-hydrogeologic coupled modeling to evaluate the hydrogeologic response to geomorphic change. Delft3D is used to model the formation of coastal deltas throughout the Holocene and create generic three-dimensional sediment distributions characteristic of fluvial, wave, and tidal dominated deltas. The generated sediment distributions are used to create three-dimensional effective grain-size maps by convoluting the spatial distribution of each grain-size. This accounts for the combined effect of multiple grain-sizes while preserving basin-scale heterogeneity commonly seen in highly facies-based depositional environments. The effective grain size maps are used as the geologic input for density-dependent groundwater flow and solute transport modeling. Results are expected to show that the degree of aquifer heterogeneity correlates to the balance of fluvial and marine morphological forces shaping sediment deposition. Spatial variability in basin-scale aquifer heterogeneity is anticipated to control the exfiltration and upwelling patterns of saline paleowater in deltaic environments. The modeling approach taken in this research is novel and allows for the investigation of evolving groundwater systems with changes in landscape. Results of this study will allow for the assessment of the delta vulnerability to freshwater degradation from upwelling saline paleowater based on morphological classification. In the future, this research may be used to help determine which deltas are most at risk for salinization and where science and engineering efforts can be most beneficial to society.
|CSDMS meeting abstract=Anthropogenic activities associated with climate change and urbanization in coastal deltas (i.e.
groundwater extraction, coastal engineering and urban loading) have resulted in freshwater
degradation through the upwelling of saline paleowater. Factors controlling the preservation of
paleowater, and the initiation of exfiltration and subsequent upwelling of saline water are not yet
well understood. This research uses coupled morphodynamic-hydrogeologic modeling to
evaluate the groundwater response to geomorphic change. Delft3D is used to model the
formation of coastal deltas throughout the Holocene and create generic three-dimensional
distributions of sediment deposits characteristic of fluvial, wave, and tidal dominated deltas. The
generated sediment deposits are used to create three-dimensional effective grain-size maps by
convoluting the spatial distribution of each grain-size. This accounts for the combined effect of
multiple grain-sizes while preserving basin-scale heterogeneity commonly seen in highly
heterogeneous depositional environments. The effective grain size maps are used as the
geologic input for density-dependent groundwater flow and solute transport modeling. Results
are expected to show that the degree of aquifer heterogeneity correlates to the balance of fluvial
and marine morphological forces shaping sediment deposition. Spatial variability in basin-scale
aquifer heterogeneity is anticipated to control the exfiltration and upwelling patterns of saline
paleowater in deltaic environments. The modeling approach taken in this research is novel and
allows for the investigation of evolving groundwater systems with changes in landscape. Results
of this study will allow for the assessment of delta vulnerability to freshwater degradation from
upwelling saline paleowater, based on morphological classification. In the future, this research
may be used to help determine which deltas are most at risk for salinization and where science
and engineering efforts can be most beneficial to society.
|CSDMS meeting posterPDF=Aspen_Anderson_CSDMS_Conference_Poster_final.pdf
|CSDMS meeting posterPNG=Aspen_Anderson_CSDMS_Conference_Poster_final.png
}}
}}
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Latest revision as of 06:12, 28 May 2019





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Coupled morphodynamic and hydrogeologic modeling for evaluating the salinization of groundwater resources in coastal deltas resources in coastal deltas

Aspen Anderson, Simon Fraser University Burnaby , Canada. aspena@sfu.ca
Diana Allen, Simon Fraser University Buranby , Canada. dallen@sfu.ca
Jeremy Venditti, Simon Fraser University Buranaby , Canada. jeremy_venditti@sfu.ca


Anthropogenic activities associated with climate change and urbanization in coastal deltas (i.e.

groundwater extraction, coastal engineering and urban loading) have resulted in freshwater degradation through the upwelling of saline paleowater. Factors controlling the preservation of paleowater, and the initiation of exfiltration and subsequent upwelling of saline water are not yet well understood. This research uses coupled morphodynamic-hydrogeologic modeling to evaluate the groundwater response to geomorphic change. Delft3D is used to model the formation of coastal deltas throughout the Holocene and create generic three-dimensional distributions of sediment deposits characteristic of fluvial, wave, and tidal dominated deltas. The generated sediment deposits are used to create three-dimensional effective grain-size maps by convoluting the spatial distribution of each grain-size. This accounts for the combined effect of multiple grain-sizes while preserving basin-scale heterogeneity commonly seen in highly heterogeneous depositional environments. The effective grain size maps are used as the geologic input for density-dependent groundwater flow and solute transport modeling. Results are expected to show that the degree of aquifer heterogeneity correlates to the balance of fluvial and marine morphological forces shaping sediment deposition. Spatial variability in basin-scale aquifer heterogeneity is anticipated to control the exfiltration and upwelling patterns of saline paleowater in deltaic environments. The modeling approach taken in this research is novel and allows for the investigation of evolving groundwater systems with changes in landscape. Results of this study will allow for the assessment of delta vulnerability to freshwater degradation from upwelling saline paleowater, based on morphological classification. In the future, this research may be used to help determine which deltas are most at risk for salinization and where science and engineering efforts can be most beneficial to society.


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