TY - JOUR
T1 - Geochemical fluxes in sandy beach aquifers
T2 - Modulation due to major physical stressors, geologic heterogeneity, and nearshore morphology
AU - Geng, Xiaolong
AU - Heiss, James W.
AU - Michael, Holly A.
AU - Li, Hailong
AU - Raubenheimer, Britt
AU - Boufadel, Michel C.
N1 - Publisher Copyright:
© 2021
PY - 2021/10
Y1 - 2021/10
N2 - Coastal beach aquifers are biogeochemically active systems that mediate chemical and material fluxes across the land-sea interface. This paper provides a review of major physical stressors and geologic features that influence flow and solute fate and transport in coastal beach aquifers. We outline current understanding of the interactions between these factors and their associated impacts on water and geochemical fluxes within and across these aquifers. The physical processes that control flow, transport, and the formation and distribution of reactive zones in beach aquifers (e.g., tides, waves, density gradients, precipitation, episodic ocean events, and evaporation) operate across overlapping temporal and spatial scales, and present challenges for measuring and modeling physical flow and biogeochemical processes in coastal groundwater systems. Geologic heterogeneity introduces further complexity by modifying flowpaths, mixing patterns, and rates of biotransformation. Interactions between these physical stressors and geological controls are likely to evolve with changes in sea level, climate variability, human settlement, coastal erosion, and other natural and anthropogenic stresses, providing avenues for scientific exploration into the future role of beach aquifers as chemical mediators between the land and ocean.
AB - Coastal beach aquifers are biogeochemically active systems that mediate chemical and material fluxes across the land-sea interface. This paper provides a review of major physical stressors and geologic features that influence flow and solute fate and transport in coastal beach aquifers. We outline current understanding of the interactions between these factors and their associated impacts on water and geochemical fluxes within and across these aquifers. The physical processes that control flow, transport, and the formation and distribution of reactive zones in beach aquifers (e.g., tides, waves, density gradients, precipitation, episodic ocean events, and evaporation) operate across overlapping temporal and spatial scales, and present challenges for measuring and modeling physical flow and biogeochemical processes in coastal groundwater systems. Geologic heterogeneity introduces further complexity by modifying flowpaths, mixing patterns, and rates of biotransformation. Interactions between these physical stressors and geological controls are likely to evolve with changes in sea level, climate variability, human settlement, coastal erosion, and other natural and anthropogenic stresses, providing avenues for scientific exploration into the future role of beach aquifers as chemical mediators between the land and ocean.
KW - Evaporation
KW - Geochemical fluxes
KW - Geologic Heterogeneity
KW - Sandy coastal aquifers
KW - Shoreline morphology and bathymetry
KW - Submarine groundwater discharge
KW - Tides and waves
KW - Vadose zone processes
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U2 - 10.1016/j.earscirev.2021.103800
DO - 10.1016/j.earscirev.2021.103800
M3 - Review article
AN - SCOPUS:85114496997
SN - 0012-8252
VL - 221
JO - Earth-Science Reviews
JF - Earth-Science Reviews
M1 - 103800
ER -