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Anthropogenic activities associated with c … Anthropogenic activities associated with climate change and urbanization in coastal deltas (i.e.</br>groundwater extraction, coastal engineering and urban loading) have resulted in freshwater</br>degradation through the upwelling of saline paleowater. Factors controlling the preservation of</br>paleowater, and the initiation of exfiltration and subsequent upwelling of saline water are not yet</br>well understood. This research uses coupled morphodynamic-hydrogeologic modeling to</br>evaluate the groundwater response to geomorphic change. Delft3D is used to model the</br>formation of coastal deltas throughout the Holocene and create generic three-dimensional</br>distributions of sediment deposits characteristic of fluvial, wave, and tidal dominated deltas. The</br>generated sediment deposits are used to create three-dimensional effective grain-size maps by</br>convoluting the spatial distribution of each grain-size. This accounts for the combined effect of</br>multiple grain-sizes while preserving basin-scale heterogeneity commonly seen in highly</br>heterogeneous depositional environments. The effective grain size maps are used as the</br>geologic input for density-dependent groundwater flow and solute transport modeling. Results</br>are expected to show that the degree of aquifer heterogeneity correlates to the balance of fluvial</br>and marine morphological forces shaping sediment deposition. Spatial variability in basin-scale</br>aquifer heterogeneity is anticipated to control the exfiltration and upwelling patterns of saline</br>paleowater in deltaic environments. The modeling approach taken in this research is novel and</br>allows for the investigation of evolving groundwater systems with changes in landscape. Results</br>of this study will allow for the assessment of delta vulnerability to freshwater degradation from</br>upwelling saline paleowater, based on morphological classification. In the future, this research</br>may be used to help determine which deltas are most at risk for salinization and where science</br>and engineering efforts can be most beneficial to society.efforts can be most beneficial to society.
Coupled morphodynamic and hydrogeologic modeling for evaluating the salinization of groundwater resources in coastal deltas resources in coastal deltas +
Burnaby +
Canada +
Simon Fraser University +
aspena@sfu.ca +
Aspen +
Simon Fraser University +
Anderson +
7789037523 +
Aspen_Anderson_CSDMS_Conference_Poster_final.pdf +
Image:Aspen_Anderson_CSDMS_Conference_Poster_final.png +
Quantifying Uncertainty in Earth Systems +
1) Morphological Modeling - Delft3D Flex Mesh +
1) PyMT - The CSDMS Python Modeling tool +
3) SALib - Model Sensitivity Analysis +
Canada +
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20:58:18, 25 January 2019 +
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12:12:00, 28 May 2019 +
